Re-format let-else per rustfmt update

compiler/rustc_ast_lowering/src/asm.rs

@@ -352,7 +352,8 @@ pub(crate) fn lower_inline_asm(
 
                                     let idx2 = *o.get();
                                     let (ref op2, op_sp2) = operands[idx2];
-                                    let Some(asm::InlineAsmRegOrRegClass::Reg(reg2)) = op2.reg() else {
+                                    let Some(asm::InlineAsmRegOrRegClass::Reg(reg2)) = op2.reg()
+                                    else {
                                         unreachable!();
                                     };
 
@@ -368,7 +369,7 @@ pub(crate) fn lower_inline_asm(
                                             assert!(!*late);
                                             let out_op_sp = if input { op_sp2 } else { op_sp };
                                             Some(out_op_sp)
-                                        },
+                                        }
                                         _ => None,
                                     };
 
@@ -377,7 +378,7 @@ pub(crate) fn lower_inline_asm(
                                         op_span2: op_sp2,
                                         reg1_name: reg.name(),
                                         reg2_name: reg2.name(),
-                                        in_out
+                                        in_out,
                                     });
                                 }
                                 Entry::Vacant(v) => {

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -714,7 +714,9 @@ fn suggest_borrow_fn_like(
             _ => None,
         };
 
-        let Some(borrow_level) = borrow_level else { return false; };
+        let Some(borrow_level) = borrow_level else {
+            return false;
+        };
         let sugg = move_sites
             .iter()
             .map(|move_site| {
@@ -763,7 +765,9 @@ fn suggest_adding_copy_bounds(&self, err: &mut Diagnostic, ty: Ty<'tcx>, span: S
             .typeck_root_def_id(self.mir_def_id().to_def_id())
             .as_local()
             .and_then(|def_id| tcx.hir().get_generics(def_id))
-        else { return; };
+        else {
+            return;
+        };
         // Try to find predicates on *generic params* that would allow copying `ty`
         let ocx = ObligationCtxt::new(&self.infcx);
         let copy_did = tcx.require_lang_item(LangItem::Copy, Some(span));
@@ -1220,18 +1224,20 @@ fn suggest_using_local_if_applicable(
             return;
         };
         let inner_param_uses = find_all_local_uses::find(self.body, inner_param.local);
-        let Some((inner_call_loc, inner_call_term)) = inner_param_uses.into_iter().find_map(|loc| {
-            let Either::Right(term) = self.body.stmt_at(loc) else {
-                debug!("{:?} is a statement, so it can't be a call", loc);
-                return None;
-            };
-            let TerminatorKind::Call { args, .. } = &term.kind else {
-                debug!("not a call: {:?}", term);
-                return None;
-            };
-            debug!("checking call args for uses of inner_param: {:?}", args);
-            args.contains(&Operand::Move(inner_param)).then_some((loc, term))
-        }) else {
+        let Some((inner_call_loc, inner_call_term)) =
+            inner_param_uses.into_iter().find_map(|loc| {
+                let Either::Right(term) = self.body.stmt_at(loc) else {
+                    debug!("{:?} is a statement, so it can't be a call", loc);
+                    return None;
+                };
+                let TerminatorKind::Call { args, .. } = &term.kind else {
+                    debug!("not a call: {:?}", term);
+                    return None;
+                };
+                debug!("checking call args for uses of inner_param: {:?}", args);
+                args.contains(&Operand::Move(inner_param)).then_some((loc, term))
+            })
+        else {
             debug!("no uses of inner_param found as a by-move call arg");
             return;
         };
@@ -1442,21 +1448,24 @@ fn visit_expr(&mut self, ex: &'hir hir::Expr<'hir>) {
         }
 
         // Get closure's arguments
-        let ty::Closure(_, substs) = typeck_results.expr_ty(closure_expr).kind() else { /* hir::Closure can be a generator too */ return };
+        let ty::Closure(_, substs) = typeck_results.expr_ty(closure_expr).kind() else {
+            /* hir::Closure can be a generator too */
+            return;
+        };
         let sig = substs.as_closure().sig();
         let tupled_params =
             tcx.erase_late_bound_regions(sig.inputs().iter().next().unwrap().map_bound(|&b| b));
         let ty::Tuple(params) = tupled_params.kind() else { return };
 
         // Find the first argument with a matching type, get its name
-        let Some((_, this_name)) = params
-            .iter()
-            .zip(hir.body_param_names(closure.body))
-            .find(|(param_ty, name)|{
+        let Some((_, this_name)) =
+            params.iter().zip(hir.body_param_names(closure.body)).find(|(param_ty, name)| {
                 // FIXME: also support deref for stuff like `Rc` arguments
                 param_ty.peel_refs() == local_ty && name != &Ident::empty()
             })
-            else { return };
+        else {
+            return;
+        };
 
         let spans;
         if let Some((_path_expr, qpath)) = finder.error_path
@@ -2899,7 +2908,9 @@ fn annotate_argument_and_return_for_borrow(
                         {
                             let def_id = def_id.expect_local();
                             for operand in operands {
-                                let (Operand::Copy(assigned_from) | Operand::Move(assigned_from)) = operand else {
+                                let (Operand::Copy(assigned_from) | Operand::Move(assigned_from)) =
+                                    operand
+                                else {
                                     continue;
                                 };
                                 debug!(
@@ -2908,7 +2919,9 @@ fn annotate_argument_and_return_for_borrow(
                                 );
 
                                 // Find the local from the operand.
-                                let Some(assigned_from_local) = assigned_from.local_or_deref_local() else {
+                                let Some(assigned_from_local) =
+                                    assigned_from.local_or_deref_local()
+                                else {
                                     continue;
                                 };
 
@@ -2961,7 +2974,9 @@ fn annotate_argument_and_return_for_borrow(
                         );
 
                         // Find the local from the rvalue.
-                        let Some(assigned_from_local) = assigned_from.local_or_deref_local() else { continue };
+                        let Some(assigned_from_local) = assigned_from.local_or_deref_local() else {
+                            continue;
+                        };
                         debug!(
                             "annotate_argument_and_return_for_borrow: \
                              assigned_from_local={:?}",
@@ -3009,7 +3024,8 @@ fn annotate_argument_and_return_for_borrow(
                         assigned_to, args
                     );
                     for operand in args {
-                        let (Operand::Copy(assigned_from) | Operand::Move(assigned_from)) = operand else {
+                        let (Operand::Copy(assigned_from) | Operand::Move(assigned_from)) = operand
+                        else {
                             continue;
                         };
                         debug!(

compiler/rustc_borrowck/src/diagnostics/mod.rs

@@ -847,14 +847,12 @@ pub(super) fn move_spans(
             kind: TerminatorKind::Call { fn_span, call_source, .. }, ..
         }) = &self.body[location.block].terminator
         {
-            let Some((method_did, method_substs)) =
-            rustc_middle::util::find_self_call(
-                    self.infcx.tcx,
-                    &self.body,
-                    target_temp,
-                    location.block,
-                )
-            else {
+            let Some((method_did, method_substs)) = rustc_middle::util::find_self_call(
+                self.infcx.tcx,
+                &self.body,
+                target_temp,
+                location.block,
+            ) else {
                 return normal_ret;
             };
 

compiler/rustc_borrowck/src/diagnostics/move_errors.rs

@@ -184,7 +184,9 @@ fn append_binding_error(
             }
             // Error with the pattern
             LookupResult::Exact(_) => {
-                let LookupResult::Parent(Some(mpi)) = self.move_data.rev_lookup.find(move_from.as_ref()) else {
+                let LookupResult::Parent(Some(mpi)) =
+                    self.move_data.rev_lookup.find(move_from.as_ref())
+                else {
                     // move_from should be a projection from match_place.
                     unreachable!("Probably not unreachable...");
                 };
@@ -494,8 +496,10 @@ fn add_move_error_suggestions(&self, err: &mut Diagnostic, binds_to: &[Local]) {
             if let LocalInfo::User(BindingForm::Var(VarBindingForm { pat_span, .. })) =
                 *bind_to.local_info()
             {
-                let Ok(pat_snippet) =
-                    self.infcx.tcx.sess.source_map().span_to_snippet(pat_span) else { continue; };
+                let Ok(pat_snippet) = self.infcx.tcx.sess.source_map().span_to_snippet(pat_span)
+                else {
+                    continue;
+                };
                 let Some(stripped) = pat_snippet.strip_prefix('&') else {
                     suggestions.push((
                         bind_to.source_info.span.shrink_to_lo(),

compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs

@@ -648,8 +648,12 @@ fn visit_stmt(&mut self, stmt: &'tcx hir::Stmt<'tcx>) {
             let def_id = self.body.source.def_id();
             let hir_id = hir_map.local_def_id_to_hir_id(def_id.as_local().unwrap());
             let node = hir_map.find(hir_id);
-            let Some(hir::Node::Item(item)) = node else { return; };
-            let hir::ItemKind::Fn(.., body_id) = item.kind else { return; };
+            let Some(hir::Node::Item(item)) = node else {
+                return;
+            };
+            let hir::ItemKind::Fn(.., body_id) = item.kind else {
+                return;
+            };
             let body = self.infcx.tcx.hir().body(body_id);
 
             let mut v = V { assign_span: span, err, ty, suggested: false };

compiler/rustc_borrowck/src/diagnostics/region_errors.rs

@@ -224,12 +224,10 @@ fn suggest_static_lifetime_for_gat_from_hrtb(
         let mut hrtb_bounds = vec![];
         gat_id_and_generics.iter().flatten().for_each(|(gat_hir_id, generics)| {
             for pred in generics.predicates {
-                let BoundPredicate(
-                        WhereBoundPredicate {
-                            bound_generic_params,
-                            bounds,
-                            ..
-                        }) = pred else { continue; };
+                let BoundPredicate(WhereBoundPredicate { bound_generic_params, bounds, .. }) = pred
+                else {
+                    continue;
+                };
                 if bound_generic_params
                     .iter()
                     .rfind(|bgp| hir.local_def_id_to_hir_id(bgp.def_id) == *gat_hir_id)
@@ -813,7 +811,9 @@ fn add_static_impl_trait_suggestion(
                 return;
             }
             let suitable_region = self.infcx.tcx.is_suitable_region(f);
-            let Some(suitable_region) = suitable_region else { return; };
+            let Some(suitable_region) = suitable_region else {
+                return;
+            };
 
             let fn_returns = self.infcx.tcx.return_type_impl_or_dyn_traits(suitable_region.def_id);
 
@@ -848,7 +848,10 @@ fn add_static_impl_trait_suggestion(
             let Some((alias_tys, alias_span, lt_addition_span)) = self
                 .infcx
                 .tcx
-                .return_type_impl_or_dyn_traits_with_type_alias(suitable_region.def_id) else { return; };
+                .return_type_impl_or_dyn_traits_with_type_alias(suitable_region.def_id)
+            else {
+                return;
+            };
 
             // in case the return type of the method is a type alias
             let mut spans_suggs: Vec<_> = Vec::new();
@@ -932,8 +935,13 @@ fn maybe_suggest_constrain_dyn_trait_impl(
         let mut visitor = TraitObjectVisitor(FxIndexSet::default());
         visitor.visit_ty(param.param_ty);
 
-        let Some((ident, self_ty)) =
-            NiceRegionError::get_impl_ident_and_self_ty_from_trait(tcx, instance.def_id(), &visitor.0) else { return; };
+        let Some((ident, self_ty)) = NiceRegionError::get_impl_ident_and_self_ty_from_trait(
+            tcx,
+            instance.def_id(),
+            &visitor.0,
+        ) else {
+            return;
+        };
 
         self.suggest_constrain_dyn_trait_in_impl(diag, &visitor.0, ident, self_ty);
     }
@@ -981,23 +989,25 @@ fn suggest_adding_lifetime_params(
         sup: RegionVid,
     ) {
         let (Some(sub), Some(sup)) = (self.to_error_region(sub), self.to_error_region(sup)) else {
-            return
+            return;
         };
 
         let Some((ty_sub, _)) = self
             .infcx
             .tcx
             .is_suitable_region(sub)
-            .and_then(|anon_reg| find_anon_type(self.infcx.tcx, sub, &anon_reg.boundregion)) else {
-            return
+            .and_then(|anon_reg| find_anon_type(self.infcx.tcx, sub, &anon_reg.boundregion))
+        else {
+            return;
         };
 
         let Some((ty_sup, _)) = self
             .infcx
             .tcx
             .is_suitable_region(sup)
-            .and_then(|anon_reg| find_anon_type(self.infcx.tcx, sup, &anon_reg.boundregion)) else {
-            return
+            .and_then(|anon_reg| find_anon_type(self.infcx.tcx, sup, &anon_reg.boundregion))
+        else {
+            return;
         };
 
         suggest_adding_lifetime_params(self.infcx.tcx, sub, ty_sup, ty_sub, diag);

compiler/rustc_borrowck/src/diagnostics/region_name.rs

@@ -325,8 +325,8 @@ fn give_name_from_error_region(&self, fr: RegionVid) -> Option<RegionName> {
                         // Can't have BrEnv in functions, constants or generators.
                         bug!("BrEnv outside of closure.");
                     };
-                    let hir::ExprKind::Closure(&hir::Closure { fn_decl_span, .. })
-                        = tcx.hir().expect_expr(self.mir_hir_id()).kind
+                    let hir::ExprKind::Closure(&hir::Closure { fn_decl_span, .. }) =
+                        tcx.hir().expect_expr(self.mir_hir_id()).kind
                     else {
                         bug!("Closure is not defined by a closure expr");
                     };

compiler/rustc_borrowck/src/region_infer/mod.rs

@@ -2058,10 +2058,17 @@ pub(crate) fn best_blame_constraint(
         let mut extra_info = vec![];
         for constraint in path.iter() {
             let outlived = constraint.sub;
-            let Some(origin) = self.var_infos.get(outlived) else { continue; };
-            let RegionVariableOrigin::Nll(NllRegionVariableOrigin::Placeholder(p)) = origin.origin else { continue; };
+            let Some(origin) = self.var_infos.get(outlived) else {
+                continue;
+            };
+            let RegionVariableOrigin::Nll(NllRegionVariableOrigin::Placeholder(p)) = origin.origin
+            else {
+                continue;
+            };
             debug!(?constraint, ?p);
-            let ConstraintCategory::Predicate(span) = constraint.category else { continue; };
+            let ConstraintCategory::Predicate(span) = constraint.category else {
+                continue;
+            };
             extra_info.push(ExtraConstraintInfo::PlaceholderFromPredicate(span));
             // We only want to point to one
             break;

compiler/rustc_borrowck/src/type_check/mod.rs

@@ -2039,28 +2039,16 @@ fn check_rvalue(&mut self, body: &Body<'tcx>, rvalue: &Rvalue<'tcx>, location: L
                     }
 
                     CastKind::PointerCoercion(PointerCoercion::MutToConstPointer) => {
-                        let ty::RawPtr(ty::TypeAndMut {
-                            ty: ty_from,
-                            mutbl: hir::Mutability::Mut,
-                        }) = op.ty(body, tcx).kind() else {
-                            span_mirbug!(
-                                self,
-                                rvalue,
-                                "unexpected base type for cast {:?}",
-                                ty,
-                            );
+                        let ty::RawPtr(ty::TypeAndMut { ty: ty_from, mutbl: hir::Mutability::Mut }) =
+                            op.ty(body, tcx).kind()
+                        else {
+                            span_mirbug!(self, rvalue, "unexpected base type for cast {:?}", ty,);
                             return;
                         };
-                        let ty::RawPtr(ty::TypeAndMut {
-                            ty: ty_to,
-                            mutbl: hir::Mutability::Not,
-                        }) = ty.kind() else {
-                            span_mirbug!(
-                                self,
-                                rvalue,
-                                "unexpected target type for cast {:?}",
-                                ty,
-                            );
+                        let ty::RawPtr(ty::TypeAndMut { ty: ty_to, mutbl: hir::Mutability::Not }) =
+                            ty.kind()
+                        else {
+                            span_mirbug!(self, rvalue, "unexpected target type for cast {:?}", ty,);
                             return;
                         };
                         if let Err(terr) = self.sub_types(

compiler/rustc_borrowck/src/universal_regions.rs

@@ -929,7 +929,9 @@ fn for_each_late_bound_region_in_item<'tcx>(
     }
 
     for bound_var in tcx.late_bound_vars(tcx.hir().local_def_id_to_hir_id(mir_def_id)) {
-        let ty::BoundVariableKind::Region(bound_region) = bound_var else { continue; };
+        let ty::BoundVariableKind::Region(bound_region) = bound_var else {
+            continue;
+        };
         let liberated_region = ty::Region::new_free(tcx, mir_def_id.to_def_id(), bound_region);
         f(liberated_region);
     }

compiler/rustc_builtin_macros/src/asm.rs

@@ -157,8 +157,7 @@ pub fn parse_asm_args<'a>(
         } else if p.eat_keyword(sym::sym) {
             let expr = p.parse_expr()?;
             let ast::ExprKind::Path(qself, path) = &expr.kind else {
-                let err = diag
-                    .create_err(errors::AsmSymNoPath { span: expr.span });
+                let err = diag.create_err(errors::AsmSymNoPath { span: expr.span });
                 return Err(err);
             };
             let sym = ast::InlineAsmSym {

compiler/rustc_builtin_macros/src/deriving/cmp/ord.rs

@@ -61,8 +61,8 @@ pub fn cs_cmp(cx: &mut ExtCtxt<'_>, span: Span, substr: &Substructure<'_>) -> Bl
         |cx, fold| match fold {
             CsFold::Single(field) => {
                 let [other_expr] = &field.other_selflike_exprs[..] else {
-                        cx.span_bug(field.span, "not exactly 2 arguments in `derive(Ord)`");
-                    };
+                    cx.span_bug(field.span, "not exactly 2 arguments in `derive(Ord)`");
+                };
                 let args = thin_vec![field.self_expr.clone(), other_expr.clone()];
                 cx.expr_call_global(field.span, cmp_path.clone(), args)
             }

compiler/rustc_builtin_macros/src/deriving/cmp/partial_ord.rs

@@ -94,8 +94,8 @@ fn cs_partial_cmp(
         |cx, fold| match fold {
             CsFold::Single(field) => {
                 let [other_expr] = &field.other_selflike_exprs[..] else {
-                        cx.span_bug(field.span, "not exactly 2 arguments in `derive(Ord)`");
-                    };
+                    cx.span_bug(field.span, "not exactly 2 arguments in `derive(Ord)`");
+                };
                 let args = thin_vec![field.self_expr.clone(), other_expr.clone()];
                 cx.expr_call_global(field.span, partial_cmp_path.clone(), args)
             }

compiler/rustc_builtin_macros/src/env.rs

@@ -83,7 +83,12 @@ pub fn expand_env<'cx>(
         None => {
             // Use the string literal in the code in the diagnostic to avoid confusing diagnostics,
             // e.g. when the literal contains escape sequences.
-            let ast::ExprKind::Lit(ast::token::Lit { kind: ast::token::LitKind::Str, symbol: original_var, ..}) = &var_expr.kind else {
+            let ast::ExprKind::Lit(ast::token::Lit {
+                kind: ast::token::LitKind::Str,
+                symbol: original_var,
+                ..
+            }) = &var_expr.kind
+            else {
                 unreachable!("`expr_to_string` ensures this is a string lit")
             };
             cx.emit_err(errors::EnvNotDefined {

compiler/rustc_builtin_macros/src/proc_macro_harness.rs

@@ -89,7 +89,9 @@ fn check_not_pub_in_root(&self, vis: &ast::Visibility, sp: Span) {
     }
 
     fn collect_custom_derive(&mut self, item: &'a ast::Item, attr: &'a ast::Attribute) {
-        let Some((trait_name, proc_attrs)) = parse_macro_name_and_helper_attrs(self.handler, attr, "derive") else {
+        let Some((trait_name, proc_attrs)) =
+            parse_macro_name_and_helper_attrs(self.handler, attr, "derive")
+        else {
             return;
         };
 

compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs

@@ -739,7 +739,10 @@ fn build_foreign_type_di_node<'ll, 'tcx>(
     debug!("build_foreign_type_di_node: {:?}", t);
 
     let &ty::Foreign(def_id) = unique_type_id.expect_ty().kind() else {
-        bug!("build_foreign_type_di_node() called with unexpected type: {:?}", unique_type_id.expect_ty());
+        bug!(
+            "build_foreign_type_di_node() called with unexpected type: {:?}",
+            unique_type_id.expect_ty()
+        );
     };
 
     build_type_with_children(

compiler/rustc_codegen_llvm/src/debuginfo/metadata/enums/cpp_like.rs

@@ -199,7 +199,7 @@ pub(super) fn build_enum_type_di_node<'ll, 'tcx>(
     let enum_type = unique_type_id.expect_ty();
     let &ty::Adt(enum_adt_def, _) = enum_type.kind() else {
         bug!("build_enum_type_di_node() called with non-enum type: `{:?}`", enum_type)
-        };
+    };
 
     let enum_type_and_layout = cx.layout_of(enum_type);
     let enum_type_name = compute_debuginfo_type_name(cx.tcx, enum_type, false);
@@ -667,7 +667,9 @@ fn build_union_fields_for_direct_tag_generator<'ll, 'tcx>(
     generator_type_and_layout: TyAndLayout<'tcx>,
     generator_type_di_node: &'ll DIType,
 ) -> SmallVec<&'ll DIType> {
-    let Variants::Multiple { tag_encoding: TagEncoding::Direct, tag_field, .. } = generator_type_and_layout.variants else {
+    let Variants::Multiple { tag_encoding: TagEncoding::Direct, tag_field, .. } =
+        generator_type_and_layout.variants
+    else {
         bug!("This function only supports layouts with directly encoded tags.")
     };
 

compiler/rustc_codegen_llvm/src/debuginfo/metadata/enums/mod.rs

@@ -51,7 +51,7 @@ pub(super) fn build_enum_type_di_node<'ll, 'tcx>(
     let enum_type = unique_type_id.expect_ty();
     let &ty::Adt(enum_adt_def, _) = enum_type.kind() else {
         bug!("build_enum_type_di_node() called with non-enum type: `{:?}`", enum_type)
-        };
+    };
 
     let enum_type_and_layout = cx.layout_of(enum_type);
 

compiler/rustc_codegen_llvm/src/debuginfo/metadata/enums/native.rs

@@ -57,7 +57,7 @@ pub(super) fn build_enum_type_di_node<'ll, 'tcx>(
     let enum_type = unique_type_id.expect_ty();
     let &ty::Adt(enum_adt_def, _) = enum_type.kind() else {
         bug!("build_enum_type_di_node() called with non-enum type: `{:?}`", enum_type)
-        };
+    };
 
     let containing_scope = get_namespace_for_item(cx, enum_adt_def.did());
     let enum_type_and_layout = cx.layout_of(enum_type);
@@ -132,9 +132,9 @@ pub(super) fn build_generator_di_node<'ll, 'tcx>(
     unique_type_id: UniqueTypeId<'tcx>,
 ) -> DINodeCreationResult<'ll> {
     let generator_type = unique_type_id.expect_ty();
-    let &ty::Generator(generator_def_id, _, _ ) = generator_type.kind() else {
+    let &ty::Generator(generator_def_id, _, _) = generator_type.kind() else {
         bug!("build_generator_di_node() called with non-generator type: `{:?}`", generator_type)
-        };
+    };
 
     let containing_scope = get_namespace_for_item(cx, generator_def_id);
     let generator_type_and_layout = cx.layout_of(generator_type);
@@ -158,7 +158,9 @@ pub(super) fn build_generator_di_node<'ll, 'tcx>(
             let generator_layout =
                 cx.tcx.optimized_mir(generator_def_id).generator_layout().unwrap();
 
-            let Variants::Multiple { tag_encoding: TagEncoding::Direct, ref variants, .. } = generator_type_and_layout.variants else {
+            let Variants::Multiple { tag_encoding: TagEncoding::Direct, ref variants, .. } =
+                generator_type_and_layout.variants
+            else {
                 bug!(
                     "Encountered generator with non-direct-tag layout: {:?}",
                     generator_type_and_layout

compiler/rustc_codegen_ssa/src/mir/debuginfo.rs

@@ -186,7 +186,11 @@ fn calculate_debuginfo_offset<
             } => {
                 let offset = indirect_offsets.last_mut().unwrap_or(&mut direct_offset);
                 let FieldsShape::Array { stride, count: _ } = place.layout().fields else {
-                    span_bug!(var.source_info.span, "ConstantIndex on non-array type {:?}", place.layout())
+                    span_bug!(
+                        var.source_info.span,
+                        "ConstantIndex on non-array type {:?}",
+                        place.layout()
+                    )
                 };
                 *offset += stride * index;
                 place = place.project_constant_index(bx, index);

compiler/rustc_codegen_ssa/src/target_features.rs

@@ -369,13 +369,9 @@ pub fn from_target_feature(
         // We allow comma separation to enable multiple features.
         target_features.extend(value.as_str().split(',').filter_map(|feature| {
             let Some(feature_gate) = supported_target_features.get(feature) else {
-                let msg =
-                    format!("the feature named `{}` is not valid for this target", feature);
+                let msg = format!("the feature named `{}` is not valid for this target", feature);
                 let mut err = tcx.sess.struct_span_err(item.span(), msg);
-                err.span_label(
-                    item.span(),
-                    format!("`{}` is not valid for this target", feature),
-                );
+                err.span_label(item.span(), format!("`{}` is not valid for this target", feature));
                 if let Some(stripped) = feature.strip_prefix('+') {
                     let valid = supported_target_features.contains_key(stripped);
                     if valid {

compiler/rustc_const_eval/src/const_eval/error.rs

@@ -150,8 +150,8 @@ pub(super) fn report<'tcx, C, F, E>(
                 tcx.sess.create_err(Spanned { span, node: layout_error.into_diagnostic() });
             err.code(rustc_errors::error_code!(E0080));
             let Some((mut err, handler)) = err.into_diagnostic() else {
-                    panic!("did not emit diag");
-                };
+                panic!("did not emit diag");
+            };
             for frame in frames {
                 err.eager_subdiagnostic(handler, frame);
             }

compiler/rustc_const_eval/src/interpret/eval_context.rs

@@ -604,7 +604,9 @@ pub(super) fn size_and_align_of(
                 // the last field). Can't have foreign types here, how would we
                 // adjust alignment and size for them?
                 let field = layout.field(self, layout.fields.count() - 1);
-                let Some((unsized_size, mut unsized_align)) = self.size_and_align_of(metadata, &field)? else {
+                let Some((unsized_size, mut unsized_align)) =
+                    self.size_and_align_of(metadata, &field)?
+                else {
                     // A field with an extern type. We don't know the actual dynamic size
                     // or the alignment.
                     return Ok(None);

compiler/rustc_const_eval/src/interpret/memory.rs

@@ -1060,11 +1060,7 @@ pub fn write_bytes_ptr(
         let size = Size::from_bytes(len);
         let Some(alloc_ref) = self.get_ptr_alloc_mut(ptr, size, Align::ONE)? else {
             // zero-sized access
-            assert_matches!(
-                src.next(),
-                None,
-                "iterator said it was empty but returned an element"
-            );
+            assert_matches!(src.next(), None, "iterator said it was empty but returned an element");
             return Ok(());
         };
 

compiler/rustc_const_eval/src/interpret/place.rs

@@ -545,14 +545,17 @@ fn write_immediate_to_mplace_no_validate(
         // wrong type.
 
         let tcx = *self.tcx;
-        let Some(mut alloc) = self.get_place_alloc_mut(&MPlaceTy { mplace: dest, layout, align })? else {
+        let Some(mut alloc) =
+            self.get_place_alloc_mut(&MPlaceTy { mplace: dest, layout, align })?
+        else {
             // zero-sized access
             return Ok(());
         };
 
         match value {
             Immediate::Scalar(scalar) => {
-                let Abi::Scalar(s) = layout.abi else { span_bug!(
+                let Abi::Scalar(s) = layout.abi else {
+                    span_bug!(
                         self.cur_span(),
                         "write_immediate_to_mplace: invalid Scalar layout: {layout:#?}",
                     )
@@ -565,7 +568,8 @@ fn write_immediate_to_mplace_no_validate(
                 // We checked `ptr_align` above, so all fields will have the alignment they need.
                 // We would anyway check against `ptr_align.restrict_for_offset(b_offset)`,
                 // which `ptr.offset(b_offset)` cannot possibly fail to satisfy.
-                let Abi::ScalarPair(a, b) = layout.abi else { span_bug!(
+                let Abi::ScalarPair(a, b) = layout.abi else {
+                    span_bug!(
                         self.cur_span(),
                         "write_immediate_to_mplace: invalid ScalarPair layout: {:#?}",
                         layout

compiler/rustc_const_eval/src/interpret/terminator.rs

@@ -390,7 +390,10 @@ fn pass_argument<'x, 'y>(
             ));
             // Allocate enough memory to hold `src`.
             let Some((size, align)) = self.size_and_align_of_mplace(&src)? else {
-                span_bug!(self.cur_span(), "unsized fn arg with `extern` type tail should not be allowed")
+                span_bug!(
+                    self.cur_span(),
+                    "unsized fn arg with `extern` type tail should not be allowed"
+                )
             };
             let ptr = self.allocate_ptr(size, align, MemoryKind::Stack)?;
             let dest_place =
@@ -468,10 +471,18 @@ pub(crate) fn eval_fn_call(
             | ty::InstanceDef::ThreadLocalShim(..)
             | ty::InstanceDef::Item(_) => {
                 // We need MIR for this fn
-                let Some((body, instance)) =
-                    M::find_mir_or_eval_fn(self, instance, caller_abi, args, destination, target, unwind)? else {
-                        return Ok(());
-                    };
+                let Some((body, instance)) = M::find_mir_or_eval_fn(
+                    self,
+                    instance,
+                    caller_abi,
+                    args,
+                    destination,
+                    target,
+                    unwind,
+                )?
+                else {
+                    return Ok(());
+                };
 
                 // Compute callee information using the `instance` returned by
                 // `find_mir_or_eval_fn`.
@@ -702,8 +713,12 @@ pub(crate) fn eval_fn_call(
                         .tcx
                         .struct_tail_erasing_lifetimes(receiver_place.layout.ty, self.param_env);
                     let ty::Dynamic(data, _, ty::Dyn) = receiver_tail.kind() else {
-                            span_bug!(self.cur_span(), "dynamic call on non-`dyn` type {}", receiver_tail)
-                        };
+                        span_bug!(
+                            self.cur_span(),
+                            "dynamic call on non-`dyn` type {}",
+                            receiver_tail
+                        )
+                    };
                     assert!(receiver_place.layout.is_unsized());
 
                     // Get the required information from the vtable.
@@ -721,7 +736,9 @@ pub(crate) fn eval_fn_call(
 
                 // Now determine the actual method to call. We can do that in two different ways and
                 // compare them to ensure everything fits.
-                let Some(ty::VtblEntry::Method(fn_inst)) = self.get_vtable_entries(vptr)?.get(idx).copied() else {
+                let Some(ty::VtblEntry::Method(fn_inst)) =
+                    self.get_vtable_entries(vptr)?.get(idx).copied()
+                else {
                     // FIXME(fee1-dead) these could be variants of the UB info enum instead of this
                     throw_ub_custom!(fluent::const_eval_dyn_call_not_a_method);
                 };

compiler/rustc_const_eval/src/transform/check_consts/check.rs

@@ -778,8 +778,7 @@ fn visit_terminator(&mut self, terminator: &Terminator<'tcx>, location: Location
                             if trait_ref.self_ty().is_closure()
                                 && tcx.fn_trait_kind_from_def_id(trait_id).is_some() =>
                         {
-                            let ty::Closure(closure_def_id, substs) =
-                                *trait_ref.self_ty().kind()
+                            let ty::Closure(closure_def_id, substs) = *trait_ref.self_ty().kind()
                             else {
                                 unreachable!()
                             };

compiler/rustc_const_eval/src/transform/promote_consts.rs

@@ -759,11 +759,7 @@ fn promote_temp(&mut self, temp: Local) -> Local {
             let (mut rvalue, source_info) = {
                 let statement = &mut self.source[loc.block].statements[loc.statement_index];
                 let StatementKind::Assign(box (_, rhs)) = &mut statement.kind else {
-                    span_bug!(
-                        statement.source_info.span,
-                        "{:?} is not an assignment",
-                        statement
-                    );
+                    span_bug!(statement.source_info.span, "{:?} is not an assignment", statement);
                 };
 
                 (
@@ -859,7 +855,9 @@ fn promote_candidate(mut self, candidate: Candidate, next_promoted_id: usize) ->
             let local_decls = &mut self.source.local_decls;
             let loc = candidate.location;
             let statement = &mut blocks[loc.block].statements[loc.statement_index];
-            let StatementKind::Assign(box (_, Rvalue::Ref(region, borrow_kind, place))) = &mut statement.kind else {
+            let StatementKind::Assign(box (_, Rvalue::Ref(region, borrow_kind, place))) =
+                &mut statement.kind
+            else {
                 bug!()
             };
 

compiler/rustc_const_eval/src/transform/validate.rs

@@ -214,9 +214,7 @@ fn check_cleanup_control_flow(&self) {
             stack.clear();
             stack.insert(bb);
             loop {
-                let Some(parent)= parent[bb].take() else {
-                    break
-                };
+                let Some(parent) = parent[bb].take() else { break };
                 let no_cycle = stack.insert(parent);
                 if !no_cycle {
                     self.fail(
@@ -399,7 +397,10 @@ fn visit_projection_elem(
                             };
 
                             let Some(layout) = gen_body.generator_layout() else {
-                                self.fail(location, format!("No generator layout for {:?}", parent_ty));
+                                self.fail(
+                                    location,
+                                    format!("No generator layout for {:?}", parent_ty),
+                                );
                                 return;
                             };
 
@@ -409,13 +410,17 @@ fn visit_projection_elem(
                             };
 
                             let Some(f_ty) = layout.field_tys.get(local) else {
-                                self.fail(location, format!("Out of bounds local {:?} for {:?}", local, parent_ty));
+                                self.fail(
+                                    location,
+                                    format!("Out of bounds local {:?} for {:?}", local, parent_ty),
+                                );
                                 return;
                             };
 
                             f_ty.ty
                         } else {
-                            let Some(f_ty) = substs.as_generator().prefix_tys().nth(f.index()) else {
+                            let Some(f_ty) = substs.as_generator().prefix_tys().nth(f.index())
+                            else {
                                 fail_out_of_bounds(self, location);
                                 return;
                             };

compiler/rustc_data_structures/src/graph/dominators/mod.rs

@@ -176,9 +176,7 @@ pub fn dominators<G: ControlFlowGraph>(graph: &G) -> Dominators<G::Node> {
             //
             // ...this may be the case if a MirPass modifies the CFG to remove
             // or rearrange certain blocks/edges.
-            let Some(v) = real_to_pre_order[v] else {
-                continue
-            };
+            let Some(v) = real_to_pre_order[v] else { continue };
 
             // eval returns a vertex x from which semi[x] is minimum among
             // vertices semi[v] +> x *> v.

compiler/rustc_errors/src/markdown/parse.rs

@@ -272,7 +272,7 @@ fn parse_ordered_li(buf: &[u8]) -> Parsed<'_> {
 fn get_indented_section(buf: &[u8]) -> (&[u8], &[u8]) {
     let mut end = buf.len();
     for (idx, window) in buf.windows(2).enumerate() {
-        let &[ch, next_ch] = window else {unreachable!("always 2 elements")};
+        let &[ch, next_ch] = window else { unreachable!("always 2 elements") };
         if idx >= buf.len().saturating_sub(2) && next_ch == b'\n' {
             // End of stream
             end = buf.len().saturating_sub(1);

compiler/rustc_errors/src/markdown/term.rs

@@ -149,7 +149,7 @@ fn write_wrapping<B: io::Write>(
             let Some((end_idx, _ch)) = iter.nth(ch_count) else {
                 // Write entire line
                 buf.write_all(to_write.as_bytes())?;
-                cur.set(cur.get()+to_write.chars().count());
+                cur.set(cur.get() + to_write.chars().count());
                 break;
             };
 

compiler/rustc_expand/src/base.rs

@@ -1366,7 +1366,7 @@ pub fn parse_macro_name_and_helper_attrs(
         return None;
     }
     let Some(trait_attr) = list[0].meta_item() else {
-        diag.emit_err(errors::NotAMetaItem {span: list[0].span()});
+        diag.emit_err(errors::NotAMetaItem { span: list[0].span() });
         return None;
     };
     let trait_ident = match trait_attr.ident() {

compiler/rustc_expand/src/config.rs

@@ -313,9 +313,10 @@ fn process_cfg_attr(&self, attr: &Attribute) -> Vec<Attribute> {
     /// the attribute is incorrect.
     pub(crate) fn expand_cfg_attr(&self, attr: &Attribute, recursive: bool) -> Vec<Attribute> {
         let Some((cfg_predicate, expanded_attrs)) =
-            rustc_parse::parse_cfg_attr(attr, &self.sess.parse_sess) else {
-                return vec![];
-            };
+            rustc_parse::parse_cfg_attr(attr, &self.sess.parse_sess)
+        else {
+            return vec![];
+        };
 
         // Lint on zero attributes in source.
         if expanded_attrs.is_empty() {
@@ -365,7 +366,9 @@ fn expand_cfg_attr_item(
         // Use the `#` in `#[cfg_attr(pred, attr)]` as the `#` token
         // for `attr` when we expand it to `#[attr]`
         let mut orig_trees = orig_tokens.into_trees();
-        let TokenTree::Token(pound_token @ Token { kind: TokenKind::Pound, .. }, _) = orig_trees.next().unwrap() else {
+        let TokenTree::Token(pound_token @ Token { kind: TokenKind::Pound, .. }, _) =
+            orig_trees.next().unwrap()
+        else {
             panic!("Bad tokens for attribute {:?}", attr);
         };
         let pound_span = pound_token.span;
@@ -373,7 +376,9 @@ fn expand_cfg_attr_item(
         let mut trees = vec![AttrTokenTree::Token(pound_token, Spacing::Alone)];
         if attr.style == AttrStyle::Inner {
             // For inner attributes, we do the same thing for the `!` in `#![some_attr]`
-            let TokenTree::Token(bang_token @ Token { kind: TokenKind::Not, .. }, _) = orig_trees.next().unwrap() else {
+            let TokenTree::Token(bang_token @ Token { kind: TokenKind::Not, .. }, _) =
+                orig_trees.next().unwrap()
+            else {
                 panic!("Bad tokens for attribute {:?}", attr);
             };
             trees.push(AttrTokenTree::Token(bang_token, Spacing::Alone));

compiler/rustc_expand/src/expand.rs

@@ -651,7 +651,8 @@ fn expand_invoc(
         ExpandResult::Ready(match invoc.kind {
             InvocationKind::Bang { mac, .. } => match ext {
                 SyntaxExtensionKind::Bang(expander) => {
-                    let Ok(tok_result) = expander.expand(self.cx, span, mac.args.tokens.clone()) else {
+                    let Ok(tok_result) = expander.expand(self.cx, span, mac.args.tokens.clone())
+                    else {
                         return ExpandResult::Ready(fragment_kind.dummy(span));
                     };
                     self.parse_ast_fragment(tok_result, fragment_kind, &mac.path, span)
@@ -704,7 +705,8 @@ fn expand_invoc(
                         self.cx.emit_err(UnsupportedKeyValue { span });
                     }
                     let inner_tokens = attr_item.args.inner_tokens();
-                    let Ok(tok_result) = expander.expand(self.cx, span, inner_tokens, tokens) else {
+                    let Ok(tok_result) = expander.expand(self.cx, span, inner_tokens, tokens)
+                    else {
                         return ExpandResult::Ready(fragment_kind.dummy(span));
                     };
                     self.parse_ast_fragment(tok_result, fragment_kind, &attr_item.path, span)
@@ -1087,9 +1089,7 @@ fn wrap_flat_map_node_noop_flat_map(
 
         // Work around borrow checker not seeing through `P`'s deref.
         let (ident, span, mut attrs) = (node.ident, node.span, mem::take(&mut node.attrs));
-        let ItemKind::Mod(_, mod_kind) = &mut node.kind else {
-            unreachable!()
-        };
+        let ItemKind::Mod(_, mod_kind) = &mut node.kind else { unreachable!() };
 
         let ecx = &mut collector.cx;
         let (file_path, dir_path, dir_ownership) = match mod_kind {

compiler/rustc_expand/src/mbe/diagnostics.rs

@@ -42,7 +42,8 @@ pub(super) fn failed_to_match_macro<'cx>(
         return result;
     }
 
-    let Some(BestFailure { token, msg: label, remaining_matcher, .. }) = tracker.best_failure else {
+    let Some(BestFailure { token, msg: label, remaining_matcher, .. }) = tracker.best_failure
+    else {
         return DummyResult::any(sp);
     };
 

compiler/rustc_expand/src/mbe/metavar_expr.rs

@@ -104,13 +104,10 @@ fn parse_depth<'sess>(
     span: Span,
 ) -> PResult<'sess, usize> {
     let Some(tt) = iter.next() else { return Ok(0) };
-    let TokenTree::Token(token::Token {
-        kind: token::TokenKind::Literal(lit), ..
-    }, _) = tt else {
-        return Err(sess.span_diagnostic.struct_span_err(
-            span,
-            "meta-variable expression depth must be a literal"
-        ));
+    let TokenTree::Token(token::Token { kind: token::TokenKind::Literal(lit), .. }, _) = tt else {
+        return Err(sess
+            .span_diagnostic
+            .struct_span_err(span, "meta-variable expression depth must be a literal"));
     };
     if let Ok(lit_kind) = LitKind::from_token_lit(*lit)
         && let LitKind::Int(n_u128, LitIntType::Unsuffixed) = lit_kind

compiler/rustc_expand/src/mbe/transcribe.rs

@@ -182,9 +182,7 @@ pub(super) fn transcribe<'a>(
                     LockstepIterSize::Constraint(len, _) => {
                         // We do this to avoid an extra clone above. We know that this is a
                         // sequence already.
-                        let mbe::TokenTree::Sequence(sp, seq) = seq else {
-                            unreachable!()
-                        };
+                        let mbe::TokenTree::Sequence(sp, seq) = seq else { unreachable!() };
 
                         // Is the repetition empty?
                         if len == 0 {
@@ -399,7 +397,9 @@ fn lockstep_iter_size(
         }
         TokenTree::MetaVarExpr(_, expr) => {
             let default_rslt = LockstepIterSize::Unconstrained;
-            let Some(ident) = expr.ident() else { return default_rslt; };
+            let Some(ident) = expr.ident() else {
+                return default_rslt;
+            };
             let name = MacroRulesNormalizedIdent::new(ident);
             match lookup_cur_matched(name, interpolations, repeats) {
                 Some(MatchedSeq(ads)) => {

compiler/rustc_hir/src/hir.rs

@@ -3150,7 +3150,9 @@ pub fn expect_mod(&self) -> &'hir Mod<'hir> {
     /// Expect an [`ItemKind::ForeignMod`] or panic.
     #[track_caller]
     pub fn expect_foreign_mod(&self) -> (Abi, &'hir [ForeignItemRef]) {
-        let ItemKind::ForeignMod { abi, items } = self.kind else { self.expect_failed("a foreign module") };
+        let ItemKind::ForeignMod { abi, items } = self.kind else {
+            self.expect_failed("a foreign module")
+        };
         (abi, items)
     }
 
@@ -3201,14 +3203,18 @@ pub fn expect_union(&self) -> (&VariantData<'hir>, &'hir Generics<'hir>) {
     pub fn expect_trait(
         self,
     ) -> (IsAuto, Unsafety, &'hir Generics<'hir>, GenericBounds<'hir>, &'hir [TraitItemRef]) {
-        let ItemKind::Trait(is_auto, unsafety, gen, bounds, items) = self.kind else { self.expect_failed("a trait") };
+        let ItemKind::Trait(is_auto, unsafety, gen, bounds, items) = self.kind else {
+            self.expect_failed("a trait")
+        };
         (is_auto, unsafety, gen, bounds, items)
     }
 
     /// Expect an [`ItemKind::TraitAlias`] or panic.
     #[track_caller]
     pub fn expect_trait_alias(&self) -> (&'hir Generics<'hir>, GenericBounds<'hir>) {
-        let ItemKind::TraitAlias(gen, bounds) = self.kind else { self.expect_failed("a trait alias") };
+        let ItemKind::TraitAlias(gen, bounds) = self.kind else {
+            self.expect_failed("a trait alias")
+        };
         (gen, bounds)
     }
 

compiler/rustc_hir_analysis/src/astconv/mod.rs

@@ -1267,9 +1267,12 @@ pub fn associated_path_to_ty(
                                 "you might have meant to specify type parameters on enum \
                                  `{type_name}`"
                             );
-                            let Some(args) = assoc_segment.args else { return; };
+                            let Some(args) = assoc_segment.args else {
+                                return;
+                            };
                             // Get the span of the generics args *including* the leading `::`.
-                            let args_span = assoc_segment.ident.span.shrink_to_hi().to(args.span_ext);
+                            let args_span =
+                                assoc_segment.ident.span.shrink_to_hi().to(args.span_ext);
                             if tcx.generics_of(adt_def.did()).count() == 0 {
                                 // FIXME(estebank): we could also verify that the arguments being
                                 // work for the `enum`, instead of just looking if it takes *any*.
@@ -1281,49 +1284,56 @@ pub fn associated_path_to_ty(
                                 );
                                 return;
                             }
-                            let Ok(snippet) = tcx.sess.source_map().span_to_snippet(args_span) else {
+                            let Ok(snippet) = tcx.sess.source_map().span_to_snippet(args_span)
+                            else {
                                 err.note(msg);
                                 return;
                             };
-                            let (qself_sugg_span, is_self) = if let hir::TyKind::Path(
-                                hir::QPath::Resolved(_, path)
-                            ) = &qself.kind {
-                                // If the path segment already has type params, we want to overwrite
-                                // them.
-                                match &path.segments {
-                                    // `segment` is the previous to last element on the path,
-                                    // which would normally be the `enum` itself, while the last
-                                    // `_` `PathSegment` corresponds to the variant.
-                                    [.., hir::PathSegment {
-                                        ident,
-                                        args,
-                                        res: Res::Def(DefKind::Enum, _),
-                                        ..
-                                    }, _] => (
-                                        // We need to include the `::` in `Type::Variant::<Args>`
-                                        // to point the span to `::<Args>`, not just `<Args>`.
-                                        ident.span.shrink_to_hi().to(args.map_or(
-                                            ident.span.shrink_to_hi(),
-                                            |a| a.span_ext)),
-                                        false,
-                                    ),
-                                    [segment] => (
-                                        // We need to include the `::` in `Type::Variant::<Args>`
-                                        // to point the span to `::<Args>`, not just `<Args>`.
-                                        segment.ident.span.shrink_to_hi().to(segment.args.map_or(
-                                            segment.ident.span.shrink_to_hi(),
-                                            |a| a.span_ext)),
-                                        kw::SelfUpper == segment.ident.name,
-                                    ),
-                                    _ => {
-                                        err.note(msg);
-                                        return;
+                            let (qself_sugg_span, is_self) =
+                                if let hir::TyKind::Path(hir::QPath::Resolved(_, path)) =
+                                    &qself.kind
+                                {
+                                    // If the path segment already has type params, we want to overwrite
+                                    // them.
+                                    match &path.segments {
+                                        // `segment` is the previous to last element on the path,
+                                        // which would normally be the `enum` itself, while the last
+                                        // `_` `PathSegment` corresponds to the variant.
+                                        [
+                                            ..,
+                                            hir::PathSegment {
+                                                ident,
+                                                args,
+                                                res: Res::Def(DefKind::Enum, _),
+                                                ..
+                                            },
+                                            _,
+                                        ] => (
+                                            // We need to include the `::` in `Type::Variant::<Args>`
+                                            // to point the span to `::<Args>`, not just `<Args>`.
+                                            ident.span.shrink_to_hi().to(args
+                                                .map_or(ident.span.shrink_to_hi(), |a| a.span_ext)),
+                                            false,
+                                        ),
+                                        [segment] => (
+                                            // We need to include the `::` in `Type::Variant::<Args>`
+                                            // to point the span to `::<Args>`, not just `<Args>`.
+                                            segment.ident.span.shrink_to_hi().to(segment
+                                                .args
+                                                .map_or(segment.ident.span.shrink_to_hi(), |a| {
+                                                    a.span_ext
+                                                })),
+                                            kw::SelfUpper == segment.ident.name,
+                                        ),
+                                        _ => {
+                                            err.note(msg);
+                                            return;
+                                        }
                                     }
-                                }
-                            } else {
-                                err.note(msg);
-                                return;
-                            };
+                                } else {
+                                    err.note(msg);
+                                    return;
+                                };
                             let suggestion = vec![
                                 if is_self {
                                     // Account for people writing `Self::Variant::<Args>`, where
@@ -1455,7 +1465,8 @@ pub fn associated_path_to_ty(
         };
 
         let trait_did = bound.def_id();
-        let Some(assoc_ty_did) = self.lookup_assoc_ty(assoc_ident, hir_ref_id, span, trait_did) else {
+        let Some(assoc_ty_did) = self.lookup_assoc_ty(assoc_ident, hir_ref_id, span, trait_did)
+        else {
             // Assume that if it's not matched, there must be a const defined with the same name
             // but it was used in a type position.
             let msg = format!("found associated const `{assoc_ident}` when type was expected");
@@ -1814,7 +1825,9 @@ fn qpath_to_ty(
 
             debug!("qpath_to_ty: self.item_def_id()={:?}", def_id);
 
-            let parent_def_id = def_id.as_local().map(|def_id| tcx.hir().local_def_id_to_hir_id(def_id))
+            let parent_def_id = def_id
+                .as_local()
+                .map(|def_id| tcx.hir().local_def_id_to_hir_id(def_id))
                 .map(|hir_id| tcx.hir().get_parent_item(hir_id).to_def_id());
 
             debug!("qpath_to_ty: parent_def_id={:?}", parent_def_id);
@@ -1850,7 +1863,7 @@ fn qpath_to_ty(
                 &[path_str],
                 item_segment.ident.name,
             );
-            return Ty::new_error(tcx,reported)
+            return Ty::new_error(tcx, reported);
         };
 
         debug!("qpath_to_ty: self_type={:?}", self_ty);
@@ -2688,7 +2701,10 @@ fn suggest_trait_fn_ty_for_impl_fn_infer(
         let hir = tcx.hir();
 
         let hir::Node::ImplItem(hir::ImplItem { kind: hir::ImplItemKind::Fn(..), ident, .. }) =
-            hir.get(fn_hir_id) else { return None };
+            hir.get(fn_hir_id)
+        else {
+            return None;
+        };
         let i = hir.get_parent(fn_hir_id).expect_item().expect_impl();
 
         let trait_ref = self.instantiate_mono_trait_ref(

compiler/rustc_hir_analysis/src/check/dropck.rs

@@ -81,8 +81,9 @@ fn ensure_drop_params_and_item_params_correspond<'tcx>(
     self_type_did: DefId,
     adt_to_impl_substs: SubstsRef<'tcx>,
 ) -> Result<(), ErrorGuaranteed> {
-    let Err(arg) = tcx.uses_unique_generic_params(adt_to_impl_substs, CheckRegions::OnlyEarlyBound) else {
-        return Ok(())
+    let Err(arg) = tcx.uses_unique_generic_params(adt_to_impl_substs, CheckRegions::OnlyEarlyBound)
+    else {
+        return Ok(());
     };
 
     let drop_impl_span = tcx.def_span(drop_impl_did);

compiler/rustc_hir_analysis/src/check/intrinsicck.rs

@@ -186,18 +186,14 @@ fn check_asm_operand_type(
         let Some((_, feature)) = supported_tys.iter().find(|&&(t, _)| t == asm_ty) else {
             let msg = format!("type `{ty}` cannot be used with this register class");
             let mut err = self.tcx.sess.struct_span_err(expr.span, msg);
-            let supported_tys: Vec<_> =
-                supported_tys.iter().map(|(t, _)| t.to_string()).collect();
+            let supported_tys: Vec<_> = supported_tys.iter().map(|(t, _)| t.to_string()).collect();
             err.note(format!(
                 "register class `{}` supports these types: {}",
                 reg_class.name(),
                 supported_tys.join(", "),
             ));
             if let Some(suggest) = reg_class.suggest_class(asm_arch, asm_ty) {
-                err.help(format!(
-                    "consider using the `{}` register class instead",
-                    suggest.name()
-                ));
+                err.help(format!("consider using the `{}` register class instead", suggest.name()));
             }
             err.emit();
             return Some(asm_ty);

compiler/rustc_hir_analysis/src/collect.rs

@@ -1282,7 +1282,9 @@ fn suggest_impl_trait<'tcx>(
          item_ty: Ty<'tcx>| {
             let trait_name = tcx.item_name(trait_def_id);
             let args_tuple = substs.type_at(1);
-            let ty::Tuple(types) = *args_tuple.kind() else { return None; };
+            let ty::Tuple(types) = *args_tuple.kind() else {
+                return None;
+            };
             let types = types.make_suggestable(tcx, false)?;
             let maybe_ret =
                 if item_ty.is_unit() { String::new() } else { format!(" -> {item_ty}") };
@@ -1315,8 +1317,12 @@ fn suggest_impl_trait<'tcx>(
             format_as_parenthesized,
         ),
     ] {
-        let Some(trait_def_id) = trait_def_id else { continue; };
-        let Some(assoc_item_def_id) = assoc_item_def_id else { continue; };
+        let Some(trait_def_id) = trait_def_id else {
+            continue;
+        };
+        let Some(assoc_item_def_id) = assoc_item_def_id else {
+            continue;
+        };
         if tcx.def_kind(assoc_item_def_id) != DefKind::AssocTy {
             continue;
         }

compiler/rustc_hir_analysis/src/collect/predicates_of.rs

@@ -66,7 +66,11 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Gen
         Some(ImplTraitInTraitData::Trait { opaque_def_id, fn_def_id }) => {
             let opaque_ty_id = tcx.hir().local_def_id_to_hir_id(opaque_def_id.expect_local());
             let opaque_ty_node = tcx.hir().get(opaque_ty_id);
-            let Node::Item(&Item { kind: ItemKind::OpaqueTy(OpaqueTy { lifetime_mapping, .. }), .. }) = opaque_ty_node else {
+            let Node::Item(&Item {
+                kind: ItemKind::OpaqueTy(OpaqueTy { lifetime_mapping, .. }),
+                ..
+            }) = opaque_ty_node
+            else {
                 bug!("unexpected {opaque_ty_node:?}")
             };
 
@@ -397,7 +401,9 @@ fn compute_bidirectional_outlives_predicates<'tcx>(
             continue;
         }
 
-        let Some(dup_index) = generics.param_def_id_to_index(icx.tcx, dup_def.to_def_id()) else { bug!() };
+        let Some(dup_index) = generics.param_def_id_to_index(icx.tcx, dup_def.to_def_id()) else {
+            bug!()
+        };
 
         let dup_region = ty::Region::new_early_bound(
             tcx,

compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs

@@ -749,9 +749,7 @@ fn visit_ty(&mut self, ty: &'tcx hir::Ty<'tcx>) {
                 // `fn foo<'a>() -> MyAnonTy<'a> { ... }`
                 //          ^                 ^this gets resolved in the current scope
                 for lifetime in lifetimes {
-                    let hir::GenericArg::Lifetime(lifetime) = lifetime else {
-                        continue
-                    };
+                    let hir::GenericArg::Lifetime(lifetime) = lifetime else { continue };
                     self.visit_lifetime(lifetime);
 
                     // Check for predicates like `impl for<'a> Trait<impl OtherTrait<'a>>`
@@ -759,12 +757,8 @@ fn visit_ty(&mut self, ty: &'tcx hir::Ty<'tcx>) {
                     // well-supported at the moment, so this doesn't work.
                     // In the future, this should be fixed and this error should be removed.
                     let def = self.map.defs.get(&lifetime.hir_id).cloned();
-                    let Some(ResolvedArg::LateBound(_, _, def_id)) = def else {
-                        continue
-                    };
-                    let Some(def_id) = def_id.as_local() else {
-                        continue
-                    };
+                    let Some(ResolvedArg::LateBound(_, _, def_id)) = def else { continue };
+                    let Some(def_id) = def_id.as_local() else { continue };
                     let hir_id = self.tcx.hir().local_def_id_to_hir_id(def_id);
                     // Ensure that the parent of the def is an item, not HRTB
                     let parent_id = self.tcx.hir().parent_id(hir_id);

compiler/rustc_hir_analysis/src/structured_errors/wrong_number_of_generic_args.rs

@@ -360,9 +360,11 @@ fn get_lifetime_args_suggestions_from_param_names(
                 &[]
             };
             ret.extend(params.iter().filter_map(|p| {
-                let hir::GenericParamKind::Lifetime { kind: hir::LifetimeParamKind::Explicit }
-                    = p.kind
-                else { return None };
+                let hir::GenericParamKind::Lifetime { kind: hir::LifetimeParamKind::Explicit } =
+                    p.kind
+                else {
+                    return None;
+                };
                 let hir::ParamName::Plain(name) = p.name else { return None };
                 Some(name.to_string())
             }));
@@ -793,29 +795,36 @@ fn suggest_moving_args_from_assoc_fn_to_trait_for_method_call(
         num_trait_generics_except_self: usize,
     ) {
         let sm = self.tcx.sess.source_map();
-        let hir::ExprKind::MethodCall(_, rcvr, args, _) = expr.kind else { return; };
+        let hir::ExprKind::MethodCall(_, rcvr, args, _) = expr.kind else {
+            return;
+        };
         if num_assoc_fn_excess_args != num_trait_generics_except_self {
             return;
         }
-        let Some(gen_args) = self.gen_args.span_ext() else { return; };
-        let Ok(generics) = sm.span_to_snippet(gen_args) else { return; };
-        let Ok(rcvr) = sm.span_to_snippet(
-            rcvr.span.find_ancestor_inside(expr.span).unwrap_or(rcvr.span)
-        ) else { return; };
-        let Ok(rest) =
-            (match args {
-                [] => Ok(String::new()),
-                [arg] => sm.span_to_snippet(
-                    arg.span.find_ancestor_inside(expr.span).unwrap_or(arg.span),
-                ),
-                [first, .., last] => {
-                    let first_span =
-                        first.span.find_ancestor_inside(expr.span).unwrap_or(first.span);
-                    let last_span =
-                        last.span.find_ancestor_inside(expr.span).unwrap_or(last.span);
-                    sm.span_to_snippet(first_span.to(last_span))
-                }
-            }) else { return; };
+        let Some(gen_args) = self.gen_args.span_ext() else {
+            return;
+        };
+        let Ok(generics) = sm.span_to_snippet(gen_args) else {
+            return;
+        };
+        let Ok(rcvr) =
+            sm.span_to_snippet(rcvr.span.find_ancestor_inside(expr.span).unwrap_or(rcvr.span))
+        else {
+            return;
+        };
+        let Ok(rest) = (match args {
+            [] => Ok(String::new()),
+            [arg] => {
+                sm.span_to_snippet(arg.span.find_ancestor_inside(expr.span).unwrap_or(arg.span))
+            }
+            [first, .., last] => {
+                let first_span = first.span.find_ancestor_inside(expr.span).unwrap_or(first.span);
+                let last_span = last.span.find_ancestor_inside(expr.span).unwrap_or(last.span);
+                sm.span_to_snippet(first_span.to(last_span))
+            }
+        }) else {
+            return;
+        };
         let comma = if args.len() > 0 { ", " } else { "" };
         let trait_path = self.tcx.def_path_str(trait_def_id);
         let method_name = self.tcx.item_name(self.def_id);

compiler/rustc_hir_typeck/src/_match.rs

@@ -188,11 +188,18 @@ fn suggest_removing_semicolon_for_coerce(
         let hir = self.tcx.hir();
 
         // First, check that we're actually in the tail of a function.
-        let Some(body_id) = hir.maybe_body_owned_by(self.body_id) else { return; };
+        let Some(body_id) = hir.maybe_body_owned_by(self.body_id) else {
+            return;
+        };
         let body = hir.body(body_id);
-        let hir::ExprKind::Block(block, _) = body.value.kind else { return; };
-        let Some(hir::Stmt { kind: hir::StmtKind::Semi(last_expr), .. })
-            = block.innermost_block().stmts.last() else {  return; };
+        let hir::ExprKind::Block(block, _) = body.value.kind else {
+            return;
+        };
+        let Some(hir::Stmt { kind: hir::StmtKind::Semi(last_expr), .. }) =
+            block.innermost_block().stmts.last()
+        else {
+            return;
+        };
         if last_expr.hir_id != expr.hir_id {
             return;
         }
@@ -201,7 +208,10 @@ fn suggest_removing_semicolon_for_coerce(
         let Some(ret) = hir
             .find_by_def_id(self.body_id)
             .and_then(|owner| owner.fn_decl())
-            .map(|decl| decl.output.span()) else { return; };
+            .map(|decl| decl.output.span())
+        else {
+            return;
+        };
         let Expectation::IsLast(stmt) = expectation else {
             return;
         };
@@ -508,9 +518,14 @@ pub(crate) fn opt_suggest_box_span(
                     span,
                     kind: TypeVariableOriginKind::OpaqueTypeInference(rpit_def_id),
                     ..
-                } = self.type_var_origin(expected)? else { return None; };
+                } = self.type_var_origin(expected)?
+                else {
+                    return None;
+                };
 
-                let Some(rpit_local_def_id) = rpit_def_id.as_local() else { return None; };
+                let Some(rpit_local_def_id) = rpit_def_id.as_local() else {
+                    return None;
+                };
                 if !matches!(
                     self.tcx.hir().expect_item(rpit_local_def_id).expect_opaque_ty().origin,
                     hir::OpaqueTyOrigin::FnReturn(..)

compiler/rustc_hir_typeck/src/callee.rs

@@ -499,15 +499,15 @@ fn suggest_call_as_method(
         expected: Expectation<'tcx>,
     ) {
         if let [callee_expr, rest @ ..] = arg_exprs {
-            let Some(callee_ty) = self.typeck_results.borrow().expr_ty_adjusted_opt(callee_expr) else {
+            let Some(callee_ty) = self.typeck_results.borrow().expr_ty_adjusted_opt(callee_expr)
+            else {
                 return;
             };
 
             // First, do a probe with `IsSuggestion(true)` to avoid emitting
             // any strange errors. If it's successful, then we'll do a true
             // method lookup.
-            let Ok(pick) = self
-            .lookup_probe_for_diagnostic(
+            let Ok(pick) = self.lookup_probe_for_diagnostic(
                 segment.ident,
                 callee_ty,
                 call_expr,

compiler/rustc_hir_typeck/src/coercion.rs

@@ -1670,7 +1670,9 @@ fn note_unreachable_loop_return(
         expr: &hir::Expr<'tcx>,
         ret_exprs: &Vec<&'tcx hir::Expr<'tcx>>,
     ) {
-        let hir::ExprKind::Loop(_, _, _, loop_span) = expr.kind else { return;};
+        let hir::ExprKind::Loop(_, _, _, loop_span) = expr.kind else {
+            return;
+        };
         let mut span: MultiSpan = vec![loop_span].into();
         span.push_span_label(loop_span, "this might have zero elements to iterate on");
         const MAXITER: usize = 3;

compiler/rustc_hir_typeck/src/demand.rs

@@ -102,7 +102,9 @@ fn adjust_expr_for_assert_eq_macro(
         found_expr: &mut &'tcx hir::Expr<'tcx>,
         expected_expr: &mut Option<&'tcx hir::Expr<'tcx>>,
     ) {
-        let Some(expected_expr) = expected_expr else { return; };
+        let Some(expected_expr) = expected_expr else {
+            return;
+        };
 
         if !found_expr.span.eq_ctxt(expected_expr.span) {
             return;
@@ -121,11 +123,17 @@ fn adjust_expr_for_assert_eq_macro(
         let hir::ExprKind::Unary(
             hir::UnOp::Deref,
             hir::Expr { kind: hir::ExprKind::Path(found_path), .. },
-        ) = found_expr.kind else { return; };
+        ) = found_expr.kind
+        else {
+            return;
+        };
         let hir::ExprKind::Unary(
             hir::UnOp::Deref,
             hir::Expr { kind: hir::ExprKind::Path(expected_path), .. },
-        ) = expected_expr.kind else { return; };
+        ) = expected_expr.kind
+        else {
+            return;
+        };
 
         for (path, name, idx, var) in [
             (expected_path, "left_val", 0, expected_expr),
@@ -285,16 +293,26 @@ pub fn note_source_of_type_mismatch_constraint(
     ) -> bool {
         let hir = self.tcx.hir();
 
-        let hir::ExprKind::Path(hir::QPath::Resolved(None, p)) = expr.kind else { return false; };
-        let [hir::PathSegment { ident, args: None, .. }] = p.segments else { return false; };
-        let hir::def::Res::Local(local_hir_id) = p.res else { return false; };
-        let hir::Node::Pat(pat) = hir.get(local_hir_id) else { return false; };
+        let hir::ExprKind::Path(hir::QPath::Resolved(None, p)) = expr.kind else {
+            return false;
+        };
+        let [hir::PathSegment { ident, args: None, .. }] = p.segments else {
+            return false;
+        };
+        let hir::def::Res::Local(local_hir_id) = p.res else {
+            return false;
+        };
+        let hir::Node::Pat(pat) = hir.get(local_hir_id) else {
+            return false;
+        };
         let (init_ty_hir_id, init) = match hir.get_parent(pat.hir_id) {
             hir::Node::Local(hir::Local { ty: Some(ty), init, .. }) => (ty.hir_id, *init),
             hir::Node::Local(hir::Local { init: Some(init), .. }) => (init.hir_id, Some(*init)),
             _ => return false,
         };
-        let Some(init_ty) = self.node_ty_opt(init_ty_hir_id) else { return false; };
+        let Some(init_ty) = self.node_ty_opt(init_ty_hir_id) else {
+            return false;
+        };
 
         // Locate all the usages of the relevant binding.
         struct FindExprs<'tcx> {
@@ -413,14 +431,18 @@ fn visit_expr(&mut self, ex: &'tcx hir::Expr<'tcx>) {
             // Bindings always update their recorded type after the fact, so we
             // need to look at the *following* usage's type to see when the
             // binding became incompatible.
-            let [binding, next_usage] = *window else { continue; };
+            let [binding, next_usage] = *window else {
+                continue;
+            };
 
             // Don't go past the binding (always gonna be a nonsense label if so)
             if binding.hir_id == expr.hir_id {
                 break;
             }
 
-            let Some(next_use_ty) = self.node_ty_opt(next_usage.hir_id) else { continue; };
+            let Some(next_use_ty) = self.node_ty_opt(next_usage.hir_id) else {
+                continue;
+            };
 
             // If the type is not constrained in a way making it not possible to
             // equate with `expected_ty` by this point, skip.
@@ -634,27 +656,36 @@ fn annotate_alternative_method_deref(
         error: Option<TypeError<'tcx>>,
     ) {
         let parent = self.tcx.hir().parent_id(expr.hir_id);
-        let Some(TypeError::Sorts(ExpectedFound { expected, .. })) = error else {return;};
-        let Some(hir::Node::Expr(hir::Expr {
-                    kind: hir::ExprKind::Assign(lhs, rhs, _), ..
-                })) = self.tcx.hir().find(parent) else {return; };
+        let Some(TypeError::Sorts(ExpectedFound { expected, .. })) = error else {
+            return;
+        };
+        let Some(hir::Node::Expr(hir::Expr { kind: hir::ExprKind::Assign(lhs, rhs, _), .. })) =
+            self.tcx.hir().find(parent)
+        else {
+            return;
+        };
         if rhs.hir_id != expr.hir_id || expected.is_closure() {
             return;
         }
-        let hir::ExprKind::Unary(hir::UnOp::Deref, deref) = lhs.kind else { return; };
-        let hir::ExprKind::MethodCall(path, base, args, _) = deref.kind else { return; };
-        let Some(self_ty) = self.typeck_results.borrow().expr_ty_adjusted_opt(base) else { return; };
+        let hir::ExprKind::Unary(hir::UnOp::Deref, deref) = lhs.kind else {
+            return;
+        };
+        let hir::ExprKind::MethodCall(path, base, args, _) = deref.kind else {
+            return;
+        };
+        let Some(self_ty) = self.typeck_results.borrow().expr_ty_adjusted_opt(base) else {
+            return;
+        };
 
-        let Ok(pick) = self
-            .lookup_probe_for_diagnostic(
-                path.ident,
-                self_ty,
-                deref,
-                probe::ProbeScope::TraitsInScope,
-                None,
-            ) else {
-                return;
-            };
+        let Ok(pick) = self.lookup_probe_for_diagnostic(
+            path.ident,
+            self_ty,
+            deref,
+            probe::ProbeScope::TraitsInScope,
+            None,
+        ) else {
+            return;
+        };
         let in_scope_methods = self.probe_for_name_many(
             probe::Mode::MethodCall,
             path.ident,
@@ -793,8 +824,12 @@ pub(crate) fn suggest_coercing_result_via_try_operator(
         expected: Ty<'tcx>,
         found: Ty<'tcx>,
     ) -> bool {
-        let ty::Adt(e, substs_e) = expected.kind() else { return false; };
-        let ty::Adt(f, substs_f) = found.kind() else { return false; };
+        let ty::Adt(e, substs_e) = expected.kind() else {
+            return false;
+        };
+        let ty::Adt(f, substs_f) = found.kind() else {
+            return false;
+        };
         if e.did() != f.did() {
             return false;
         }
@@ -1039,7 +1074,9 @@ fn suggest_non_zero_new_unwrap(
             // In case Option<NonZero*> is wanted, but * is provided, suggest calling new
             ty::Adt(adt, substs) if tcx.is_diagnostic_item(sym::Option, adt.did()) => {
                 // Unwrap option
-                let ty::Adt(adt, _) = substs.type_at(0).kind() else { return false; };
+                let ty::Adt(adt, _) = substs.type_at(0).kind() else {
+                    return false;
+                };
 
                 (adt, "")
             }
@@ -1061,10 +1098,11 @@ fn suggest_non_zero_new_unwrap(
             (sym::NonZeroI128, tcx.types.i128),
         ];
 
-        let Some((s, _)) = map
-            .iter()
-            .find(|&&(s, t)| self.tcx.is_diagnostic_item(s, adt.did()) && self.can_coerce(expr_ty, t))
-            else { return false; };
+        let Some((s, _)) = map.iter().find(|&&(s, t)| {
+            self.tcx.is_diagnostic_item(s, adt.did()) && self.can_coerce(expr_ty, t)
+        }) else {
+            return false;
+        };
 
         let path = self.tcx.def_path_str(adt.non_enum_variant().def_id);
 
@@ -1152,7 +1190,9 @@ fn can_use_as_ref(&self, expr: &hir::Expr<'_>) -> Option<(Vec<(Span, String)>, &
         };
 
         let local_parent = self.tcx.hir().parent_id(local_id);
-        let Some(Node::Param(hir::Param { hir_id: param_hir_id, .. })) = self.tcx.hir().find(local_parent) else {
+        let Some(Node::Param(hir::Param { hir_id: param_hir_id, .. })) =
+            self.tcx.hir().find(local_parent)
+        else {
             return None;
         };
 
@@ -1161,7 +1201,8 @@ fn can_use_as_ref(&self, expr: &hir::Expr<'_>) -> Option<(Vec<(Span, String)>, &
             hir_id: expr_hir_id,
             kind: hir::ExprKind::Closure(hir::Closure { fn_decl: closure_fn_decl, .. }),
             ..
-        })) = self.tcx.hir().find(param_parent) else {
+        })) = self.tcx.hir().find(param_parent)
+        else {
             return None;
         };
 
@@ -1174,7 +1215,8 @@ fn can_use_as_ref(&self, expr: &hir::Expr<'_>) -> Option<(Vec<(Span, String)>, &
                 ..
             })),
             1,
-        ) = (hir, closure_params_len) else {
+        ) = (hir, closure_params_len)
+        else {
             return None;
         };
 
@@ -2028,11 +2070,11 @@ pub fn suggest_method_call_on_range_literal(
         if !hir::is_range_literal(expr) {
             return;
         }
-        let hir::ExprKind::Struct(
-            hir::QPath::LangItem(LangItem::Range, ..),
-            [start, end],
-            _,
-        ) = expr.kind else { return; };
+        let hir::ExprKind::Struct(hir::QPath::LangItem(LangItem::Range, ..), [start, end], _) =
+            expr.kind
+        else {
+            return;
+        };
         let parent = self.tcx.hir().parent_id(expr.hir_id);
         if let Some(hir::Node::ExprField(_)) = self.tcx.hir().find(parent) {
             // Ignore `Foo { field: a..Default::default() }`
@@ -2048,8 +2090,12 @@ pub fn suggest_method_call_on_range_literal(
             // cannot guide the method probe.
             expectation = None;
         }
-        let hir::ExprKind::Call(method_name, _) = expr.kind else { return; };
-        let ty::Adt(adt, _) = checked_ty.kind() else { return; };
+        let hir::ExprKind::Call(method_name, _) = expr.kind else {
+            return;
+        };
+        let ty::Adt(adt, _) = checked_ty.kind() else {
+            return;
+        };
         if self.tcx.lang_items().range_struct() != Some(adt.did()) {
             return;
         }
@@ -2059,8 +2105,12 @@ pub fn suggest_method_call_on_range_literal(
             return;
         }
         // Check if start has method named end.
-        let hir::ExprKind::Path(hir::QPath::Resolved(None, p)) = method_name.kind else { return; };
-        let [hir::PathSegment { ident, .. }] = p.segments else { return; };
+        let hir::ExprKind::Path(hir::QPath::Resolved(None, p)) = method_name.kind else {
+            return;
+        };
+        let [hir::PathSegment { ident, .. }] = p.segments else {
+            return;
+        };
         let self_ty = self.typeck_results.borrow().expr_ty(start.expr);
         let Ok(_pick) = self.lookup_probe_for_diagnostic(
             *ident,
@@ -2068,7 +2118,9 @@ pub fn suggest_method_call_on_range_literal(
             expr,
             probe::ProbeScope::AllTraits,
             expectation,
-        ) else { return; };
+        ) else {
+            return;
+        };
         let mut sugg = ".";
         let mut span = start.expr.span.between(end.expr.span);
         if span.lo() + BytePos(2) == span.hi() {
@@ -2097,17 +2149,23 @@ fn suggest_return_binding_for_missing_tail_expr(
         if !checked_ty.is_unit() {
             return;
         }
-        let hir::ExprKind::Path(hir::QPath::Resolved(None, path)) = expr.kind else { return; };
-        let hir::def::Res::Local(hir_id) = path.res else { return; };
+        let hir::ExprKind::Path(hir::QPath::Resolved(None, path)) = expr.kind else {
+            return;
+        };
+        let hir::def::Res::Local(hir_id) = path.res else {
+            return;
+        };
         let Some(hir::Node::Pat(pat)) = self.tcx.hir().find(hir_id) else {
             return;
         };
-        let Some(hir::Node::Local(hir::Local {
-            ty: None,
-            init: Some(init),
-            ..
-        })) = self.tcx.hir().find_parent(pat.hir_id) else { return; };
-        let hir::ExprKind::Block(block, None) = init.kind else { return; };
+        let Some(hir::Node::Local(hir::Local { ty: None, init: Some(init), .. })) =
+            self.tcx.hir().find_parent(pat.hir_id)
+        else {
+            return;
+        };
+        let hir::ExprKind::Block(block, None) = init.kind else {
+            return;
+        };
         if block.expr.is_some() {
             return;
         }
@@ -2115,8 +2173,12 @@ fn suggest_return_binding_for_missing_tail_expr(
             err.span_label(block.span, "this empty block is missing a tail expression");
             return;
         };
-        let hir::StmtKind::Semi(tail_expr) = stmt.kind else { return; };
-        let Some(ty) = self.node_ty_opt(tail_expr.hir_id) else { return; };
+        let hir::StmtKind::Semi(tail_expr) = stmt.kind else {
+            return;
+        };
+        let Some(ty) = self.node_ty_opt(tail_expr.hir_id) else {
+            return;
+        };
         if self.can_eq(self.param_env, expected_ty, ty) {
             err.span_suggestion_short(
                 stmt.span.with_lo(tail_expr.span.hi()),
@@ -2135,7 +2197,9 @@ fn note_wrong_return_ty_due_to_generic_arg(
         expr: &hir::Expr<'_>,
         checked_ty: Ty<'tcx>,
     ) {
-        let Some(hir::Node::Expr(parent_expr)) = self.tcx.hir().find_parent(expr.hir_id) else { return; };
+        let Some(hir::Node::Expr(parent_expr)) = self.tcx.hir().find_parent(expr.hir_id) else {
+            return;
+        };
         enum CallableKind {
             Function,
             Method,
@@ -2151,7 +2215,12 @@ enum CallableKind {
                 return;
             }
             let fn_sig = fn_ty.fn_sig(self.tcx).skip_binder();
-            let Some(&arg) = fn_sig.inputs().get(arg_idx + if matches!(kind, CallableKind::Method) { 1 } else { 0 }) else { return; };
+            let Some(&arg) = fn_sig
+                .inputs()
+                .get(arg_idx + if matches!(kind, CallableKind::Method) { 1 } else { 0 })
+            else {
+                return;
+            };
             if matches!(arg.kind(), ty::Param(_))
                 && fn_sig.output().contains(arg)
                 && self.node_ty(args[arg_idx].hir_id) == checked_ty
@@ -2185,8 +2254,12 @@ enum CallableKind {
         };
         match parent_expr.kind {
             hir::ExprKind::Call(fun, args) => {
-                let hir::ExprKind::Path(hir::QPath::Resolved(_, path)) = fun.kind else { return; };
-                let hir::def::Res::Def(kind, def_id) = path.res else { return; };
+                let hir::ExprKind::Path(hir::QPath::Resolved(_, path)) = fun.kind else {
+                    return;
+                };
+                let hir::def::Res::Def(kind, def_id) = path.res else {
+                    return;
+                };
                 let callable_kind = if matches!(kind, hir::def::DefKind::Ctor(_, _)) {
                     CallableKind::Constructor
                 } else {
@@ -2195,7 +2268,11 @@ enum CallableKind {
                 maybe_emit_help(def_id, path.segments[0].ident, args, callable_kind);
             }
             hir::ExprKind::MethodCall(method, _receiver, args, _span) => {
-                let Some(def_id) = self.typeck_results.borrow().type_dependent_def_id(parent_expr.hir_id) else { return; };
+                let Some(def_id) =
+                    self.typeck_results.borrow().type_dependent_def_id(parent_expr.hir_id)
+                else {
+                    return;
+                };
                 maybe_emit_help(def_id, method.ident, args, CallableKind::Method)
             }
             _ => return,

compiler/rustc_hir_typeck/src/expr.rs

@@ -650,7 +650,8 @@ fn check_expr_break(
             let mut enclosing_breakables = self.enclosing_breakables.borrow_mut();
             let Some(ctxt) = enclosing_breakables.opt_find_breakable(target_id) else {
                 // Avoid ICE when `break` is inside a closure (#65383).
-                return Ty::new_error_with_message(tcx,
+                return Ty::new_error_with_message(
+                    tcx,
                     expr.span,
                     "break was outside loop, but no error was emitted",
                 );
@@ -1390,11 +1391,13 @@ fn suggest_array_len(&self, expr: &'tcx hir::Expr<'tcx>, array_len: u64) {
         let parent_node = self.tcx.hir().parent_iter(expr.hir_id).find(|(_, node)| {
             !matches!(node, hir::Node::Expr(hir::Expr { kind: hir::ExprKind::AddrOf(..), .. }))
         });
-        let Some((_,
+        let Some((
+            _,
             hir::Node::Local(hir::Local { ty: Some(ty), .. })
-            | hir::Node::Item(hir::Item { kind: hir::ItemKind::Const(ty, _), .. }))
-        ) = parent_node else {
-            return
+            | hir::Node::Item(hir::Item { kind: hir::ItemKind::Const(ty, _), .. }),
+        )) = parent_node
+        else {
+            return;
         };
         if let hir::TyKind::Array(_, length) = ty.peel_refs().kind
             && let hir::ArrayLen::Body(hir::AnonConst { hir_id, .. }) = length
@@ -2416,7 +2419,9 @@ fn suggest_await_on_field_access(
         base: &'tcx hir::Expr<'tcx>,
         ty: Ty<'tcx>,
     ) {
-        let Some(output_ty) = self.get_impl_future_output_ty(ty) else { return; };
+        let Some(output_ty) = self.get_impl_future_output_ty(ty) else {
+            return;
+        };
         let mut add_label = true;
         if let ty::Adt(def, _) = output_ty.kind() {
             // no field access on enum type

compiler/rustc_hir_typeck/src/fn_ctxt/adjust_fulfillment_errors.rs

@@ -14,14 +14,27 @@ pub fn adjust_fulfillment_error_for_expr_obligation(
         &self,
         error: &mut traits::FulfillmentError<'tcx>,
     ) -> bool {
-        let (traits::ExprItemObligation(def_id, hir_id, idx) | traits::ExprBindingObligation(def_id, _, hir_id, idx))
-            = *error.obligation.cause.code().peel_derives() else { return false; };
+        let (traits::ExprItemObligation(def_id, hir_id, idx)
+        | traits::ExprBindingObligation(def_id, _, hir_id, idx)) =
+            *error.obligation.cause.code().peel_derives()
+        else {
+            return false;
+        };
         let hir = self.tcx.hir();
-        let hir::Node::Expr(expr) = hir.get(hir_id) else { return false; };
+        let hir::Node::Expr(expr) = hir.get(hir_id) else {
+            return false;
+        };
 
-        let Some(unsubstituted_pred) =
-            self.tcx.predicates_of(def_id).instantiate_identity(self.tcx).predicates.into_iter().nth(idx)
-            else { return false; };
+        let Some(unsubstituted_pred) = self
+            .tcx
+            .predicates_of(def_id)
+            .instantiate_identity(self.tcx)
+            .predicates
+            .into_iter()
+            .nth(idx)
+        else {
+            return false;
+        };
 
         let generics = self.tcx.generics_of(def_id);
         let predicate_substs = match unsubstituted_pred.kind().skip_binder() {
@@ -229,14 +242,14 @@ fn point_at_generic_if_possible(
             .tcx
             .generics_of(def_id)
             .own_substs(ty::InternalSubsts::identity_for_item(self.tcx, def_id));
-        let Some((index, _)) = own_substs
-            .iter()
-            .enumerate()
-            .find(|(_, arg)| **arg == param_to_point_at) else { return false };
-        let Some(arg) = segment
-            .args()
-            .args
-            .get(index) else { return false; };
+        let Some((index, _)) =
+            own_substs.iter().enumerate().find(|(_, arg)| **arg == param_to_point_at)
+        else {
+            return false;
+        };
+        let Some(arg) = segment.args().args.get(index) else {
+            return false;
+        };
         error.obligation.cause.span = arg
             .span()
             .find_ancestor_in_same_ctxt(error.obligation.cause.span)
@@ -573,9 +586,11 @@ fn blame_specific_part_of_expr_corresponding_to_generic_param(
             // Find out which of `in_ty_elements` refer to `param`.
             // FIXME: It may be better to take the first if there are multiple,
             // just so that the error points to a smaller expression.
-            let Some((drill_expr, drill_ty)) = is_iterator_singleton(expr_elements.iter().zip( in_ty_elements.iter()).filter(|(_expr_elem, in_ty_elem)| {
-                find_param_in_ty((*in_ty_elem).into(), param)
-            })) else {
+            let Some((drill_expr, drill_ty)) =
+                is_iterator_singleton(expr_elements.iter().zip(in_ty_elements.iter()).filter(
+                    |(_expr_elem, in_ty_elem)| find_param_in_ty((*in_ty_elem).into(), param),
+                ))
+            else {
                 // The param is not mentioned, or it is mentioned in multiple indexes.
                 return Err(expr);
             };
@@ -594,7 +609,9 @@ fn blame_specific_part_of_expr_corresponding_to_generic_param(
         {
             // First, confirm that this struct is the same one as in the types, and if so,
             // find the right variant.
-            let Res::Def(expr_struct_def_kind, expr_struct_def_id) = self.typeck_results.borrow().qpath_res(expr_struct_path, expr.hir_id) else {
+            let Res::Def(expr_struct_def_kind, expr_struct_def_id) =
+                self.typeck_results.borrow().qpath_res(expr_struct_path, expr.hir_id)
+            else {
                 return Err(expr);
             };
 
@@ -621,16 +638,14 @@ fn blame_specific_part_of_expr_corresponding_to_generic_param(
 
             // We need to know which of the generic parameters mentions our target param.
             // We expect that at least one of them does, since it is expected to be mentioned.
-            let Some((drill_generic_index, generic_argument_type)) =
-                is_iterator_singleton(
-                    in_ty_adt_generic_args.iter().enumerate().filter(
-                        |(_index, in_ty_generic)| {
-                            find_param_in_ty(*in_ty_generic, param)
-                        },
-                    ),
-                ) else {
-                    return Err(expr);
-                };
+            let Some((drill_generic_index, generic_argument_type)) = is_iterator_singleton(
+                in_ty_adt_generic_args
+                    .iter()
+                    .enumerate()
+                    .filter(|(_index, in_ty_generic)| find_param_in_ty(*in_ty_generic, param)),
+            ) else {
+                return Err(expr);
+            };
 
             let struct_generic_parameters: &ty::Generics = self.tcx.generics_of(in_ty_adt.did());
             if drill_generic_index >= struct_generic_parameters.params.len() {
@@ -703,7 +718,9 @@ fn blame_specific_part_of_expr_corresponding_to_generic_param(
             };
             // This is (possibly) a constructor call, like `Some(...)` or `MyStruct(a, b, c)`.
 
-            let Res::Def(expr_struct_def_kind, expr_ctor_def_id) = self.typeck_results.borrow().qpath_res(expr_callee_path, expr_callee.hir_id) else {
+            let Res::Def(expr_struct_def_kind, expr_ctor_def_id) =
+                self.typeck_results.borrow().qpath_res(expr_callee_path, expr_callee.hir_id)
+            else {
                 return Err(expr);
             };
 
@@ -744,16 +761,14 @@ fn blame_specific_part_of_expr_corresponding_to_generic_param(
 
             // We need to know which of the generic parameters mentions our target param.
             // We expect that at least one of them does, since it is expected to be mentioned.
-            let Some((drill_generic_index, generic_argument_type)) =
-                is_iterator_singleton(
-                    in_ty_adt_generic_args.iter().enumerate().filter(
-                        |(_index, in_ty_generic)| {
-                            find_param_in_ty(*in_ty_generic, param)
-                        },
-                    ),
-                ) else {
-                    return Err(expr);
-                };
+            let Some((drill_generic_index, generic_argument_type)) = is_iterator_singleton(
+                in_ty_adt_generic_args
+                    .iter()
+                    .enumerate()
+                    .filter(|(_index, in_ty_generic)| find_param_in_ty(*in_ty_generic, param)),
+            ) else {
+                return Err(expr);
+            };
 
             let struct_generic_parameters: &ty::Generics = self.tcx.generics_of(in_ty_adt.did());
             if drill_generic_index >= struct_generic_parameters.params.len() {
@@ -794,7 +809,7 @@ fn blame_specific_part_of_expr_corresponding_to_generic_param(
                     .iter()
                     .map(|field| field.ty(self.tcx, *in_ty_adt_generic_args))
                     .enumerate()
-                    .filter(|(_index, field_type)| find_param_in_ty((*field_type).into(), param))
+                    .filter(|(_index, field_type)| find_param_in_ty((*field_type).into(), param)),
             ) else {
                 return Err(expr);
             };

compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs

@@ -753,11 +753,11 @@ fn has_error_or_infer<'tcx>(tys: impl IntoIterator<Item = Ty<'tcx>>) -> bool {
         }
 
         errors.retain(|error| {
-            let Error::Invalid(
-                provided_idx,
-                expected_idx,
-                Compatibility::Incompatible(Some(e)),
-            ) = error else { return true };
+            let Error::Invalid(provided_idx, expected_idx, Compatibility::Incompatible(Some(e))) =
+                error
+            else {
+                return true;
+            };
             let (provided_ty, provided_span) = provided_arg_tys[*provided_idx];
             let trace =
                 mk_trace(provided_span, formal_and_expected_inputs[*expected_idx], provided_ty);

compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs

@@ -97,8 +97,9 @@ pub(crate) fn suggest_fn_call(
         found: Ty<'tcx>,
         can_satisfy: impl FnOnce(Ty<'tcx>) -> bool,
     ) -> bool {
-        let Some((def_id_or_name, output, inputs)) = self.extract_callable_info(found)
-            else { return false; };
+        let Some((def_id_or_name, output, inputs)) = self.extract_callable_info(found) else {
+            return false;
+        };
         if can_satisfy(output) {
             let (sugg_call, mut applicability) = match inputs.len() {
                 0 => ("".to_string(), Applicability::MachineApplicable),
@@ -180,10 +181,12 @@ pub fn suggest_two_fn_call(
         rhs_ty: Ty<'tcx>,
         can_satisfy: impl FnOnce(Ty<'tcx>, Ty<'tcx>) -> bool,
     ) -> bool {
-        let Some((_, lhs_output_ty, lhs_inputs)) = self.extract_callable_info(lhs_ty)
-            else { return false; };
-        let Some((_, rhs_output_ty, rhs_inputs)) = self.extract_callable_info(rhs_ty)
-            else { return false; };
+        let Some((_, lhs_output_ty, lhs_inputs)) = self.extract_callable_info(lhs_ty) else {
+            return false;
+        };
+        let Some((_, rhs_output_ty, rhs_inputs)) = self.extract_callable_info(rhs_ty) else {
+            return false;
+        };
 
         if can_satisfy(lhs_output_ty, rhs_output_ty) {
             let mut sugg = vec![];
@@ -635,7 +638,9 @@ pub(in super::super) fn suggest_calling_boxed_future_when_appropriate(
                 // is and we were expecting a Box, ergo Pin<Box<expected>>, we
                 // can suggest Box::pin.
                 let parent = self.tcx.hir().parent_id(expr.hir_id);
-                let Some(Node::Expr(Expr { kind: ExprKind::Call(fn_name, _), .. })) = self.tcx.hir().find(parent) else {
+                let Some(Node::Expr(Expr { kind: ExprKind::Call(fn_name, _), .. })) =
+                    self.tcx.hir().find(parent)
+                else {
                     return false;
                 };
                 match fn_name.kind {
@@ -850,12 +855,18 @@ fn try_suggest_return_impl_trait(
         let Some(hir::Node::Item(hir::Item {
             kind:
                 hir::ItemKind::Fn(
-                    hir::FnSig { decl: hir::FnDecl { inputs: fn_parameters, output: fn_return, .. }, .. },
+                    hir::FnSig {
+                        decl: hir::FnDecl { inputs: fn_parameters, output: fn_return, .. },
+                        ..
+                    },
                     hir::Generics { params, predicates, .. },
                     _body_id,
                 ),
             ..
-        })) = fn_node else { return };
+        })) = fn_node
+        else {
+            return;
+        };
 
         if params.get(expected_ty_as_param.index as usize).is_none() {
             return;
@@ -1081,8 +1092,12 @@ pub(crate) fn suggest_copied_or_cloned(
         expr_ty: Ty<'tcx>,
         expected_ty: Ty<'tcx>,
     ) -> bool {
-        let ty::Adt(adt_def, substs) = expr_ty.kind() else { return false; };
-        let ty::Adt(expected_adt_def, expected_substs) = expected_ty.kind() else { return false; };
+        let ty::Adt(adt_def, substs) = expr_ty.kind() else {
+            return false;
+        };
+        let ty::Adt(expected_adt_def, expected_substs) = expected_ty.kind() else {
+            return false;
+        };
         if adt_def != expected_adt_def {
             return false;
         }
@@ -1205,7 +1220,9 @@ pub(crate) fn suggest_option_to_bool(
             return false;
         }
 
-        let ty::Adt(def, _) = expr_ty.peel_refs().kind() else { return false; };
+        let ty::Adt(def, _) = expr_ty.peel_refs().kind() else {
+            return false;
+        };
         if !self.tcx.is_diagnostic_item(sym::Option, def.did()) {
             return false;
         }
@@ -1327,7 +1344,9 @@ pub(crate) fn suggest_floating_point_literal(
                 node: rustc_ast::LitKind::Int(lit, rustc_ast::LitIntType::Unsuffixed),
                 span,
             }) => {
-                let Ok(snippet) = self.tcx.sess.source_map().span_to_snippet(*span) else { return false; };
+                let Ok(snippet) = self.tcx.sess.source_map().span_to_snippet(*span) else {
+                    return false;
+                };
                 if !(snippet.starts_with("0x") || snippet.starts_with("0X")) {
                     return false;
                 }
@@ -1367,10 +1386,7 @@ pub(crate) fn suggest_null_ptr_for_literal_zero_given_to_ptr_arg(
         };
 
         // Provided expression needs to be a literal `0`.
-        let ExprKind::Lit(Spanned {
-            node: rustc_ast::LitKind::Int(0, _),
-            span,
-        }) = expr.kind else {
+        let ExprKind::Lit(Spanned { node: rustc_ast::LitKind::Int(0, _), span }) = expr.kind else {
             return false;
         };
 
@@ -1401,7 +1417,9 @@ pub(crate) fn suggest_associated_const(
         expr: &hir::Expr<'_>,
         expected_ty: Ty<'tcx>,
     ) -> bool {
-        let Some((DefKind::AssocFn, old_def_id)) = self.typeck_results.borrow().type_dependent_def(expr.hir_id) else {
+        let Some((DefKind::AssocFn, old_def_id)) =
+            self.typeck_results.borrow().type_dependent_def(expr.hir_id)
+        else {
             return false;
         };
         let old_item_name = self.tcx.item_name(old_def_id);
@@ -1494,8 +1512,12 @@ pub(crate) fn note_type_is_not_clone(
         found_ty: Ty<'tcx>,
         expr: &hir::Expr<'_>,
     ) {
-        let hir::ExprKind::MethodCall(segment, callee_expr, &[], _) = expr.kind else { return; };
-        let Some(clone_trait_did) = self.tcx.lang_items().clone_trait() else { return; };
+        let hir::ExprKind::MethodCall(segment, callee_expr, &[], _) = expr.kind else {
+            return;
+        };
+        let Some(clone_trait_did) = self.tcx.lang_items().clone_trait() else {
+            return;
+        };
         let ty::Ref(_, pointee_ty, _) = found_ty.kind() else { return };
         let results = self.typeck_results.borrow();
         // First, look for a `Clone::clone` call

compiler/rustc_hir_typeck/src/method/confirm.rs

@@ -171,7 +171,8 @@ fn adjust_self_ty(
         // time writing the results into the various typeck results.
         let mut autoderef = self.autoderef(self.call_expr.span, unadjusted_self_ty);
         let Some((ty, n)) = autoderef.nth(pick.autoderefs) else {
-            return Ty::new_error_with_message(self.tcx,
+            return Ty::new_error_with_message(
+                self.tcx,
                 rustc_span::DUMMY_SP,
                 format!("failed autoderef {}", pick.autoderefs),
             );

compiler/rustc_hir_typeck/src/method/probe.rs

@@ -1938,13 +1938,21 @@ fn is_relevant_kind_for_mode(&self, kind: ty::AssocKind) -> bool {
     /// Determine if the associated item withe the given DefId matches
     /// the desired name via a doc alias.
     fn matches_by_doc_alias(&self, def_id: DefId) -> bool {
-        let Some(name) = self.method_name else { return false; };
-        let Some(local_def_id) = def_id.as_local() else { return false; };
+        let Some(name) = self.method_name else {
+            return false;
+        };
+        let Some(local_def_id) = def_id.as_local() else {
+            return false;
+        };
         let hir_id = self.fcx.tcx.hir().local_def_id_to_hir_id(local_def_id);
         let attrs = self.fcx.tcx.hir().attrs(hir_id);
         for attr in attrs {
-            let sym::doc = attr.name_or_empty() else { continue; };
-            let Some(values) = attr.meta_item_list() else { continue; };
+            let sym::doc = attr.name_or_empty() else {
+                continue;
+            };
+            let Some(values) = attr.meta_item_list() else {
+                continue;
+            };
             for v in values {
                 if v.name_or_empty() != sym::alias {
                     continue;

compiler/rustc_hir_typeck/src/method/suggest.rs

@@ -1699,10 +1699,14 @@ fn suggest_constraining_numerical_ty(
     /// we try to suggest `rect.area()`
     pub(crate) fn suggest_assoc_method_call(&self, segs: &[PathSegment<'_>]) {
         debug!("suggest_assoc_method_call segs: {:?}", segs);
-        let [seg1, seg2] = segs else { return; };
+        let [seg1, seg2] = segs else {
+            return;
+        };
         let Some(mut diag) =
-                self.tcx.sess.diagnostic().steal_diagnostic(seg1.ident.span, StashKey::CallAssocMethod)
-                else { return };
+            self.tcx.sess.diagnostic().steal_diagnostic(seg1.ident.span, StashKey::CallAssocMethod)
+        else {
+            return;
+        };
 
         let map = self.infcx.tcx.hir();
         let body_id = self.tcx.hir().body_owned_by(self.body_id);
@@ -1839,17 +1843,23 @@ fn suggest_unwrapping_inner_self(
         item_name: Ident,
     ) {
         let tcx = self.tcx;
-        let SelfSource::MethodCall(expr) = source else { return; };
+        let SelfSource::MethodCall(expr) = source else {
+            return;
+        };
         let call_expr = tcx.hir().expect_expr(tcx.hir().parent_id(expr.hir_id));
 
-        let ty::Adt(kind, substs) = actual.kind() else { return; };
+        let ty::Adt(kind, substs) = actual.kind() else {
+            return;
+        };
         match kind.adt_kind() {
             ty::AdtKind::Enum => {
                 let matching_variants: Vec<_> = kind
                     .variants()
                     .iter()
                     .flat_map(|variant| {
-                        let [field] = &variant.fields.raw[..] else { return None; };
+                        let [field] = &variant.fields.raw[..] else {
+                            return None;
+                        };
                         let field_ty = field.ty(tcx, substs);
 
                         // Skip `_`, since that'll just lead to ambiguity.
@@ -1927,15 +1937,21 @@ fn suggest_unwrapping_inner_self(
             // Target wrapper types - types that wrap or pretend to wrap another type,
             // perhaps this inner type is meant to be called?
             ty::AdtKind::Struct | ty::AdtKind::Union => {
-                let [first] = ***substs else { return; };
-                let ty::GenericArgKind::Type(ty) = first.unpack() else { return; };
+                let [first] = ***substs else {
+                    return;
+                };
+                let ty::GenericArgKind::Type(ty) = first.unpack() else {
+                    return;
+                };
                 let Ok(pick) = self.lookup_probe_for_diagnostic(
                     item_name,
                     ty,
                     call_expr,
                     ProbeScope::TraitsInScope,
                     None,
-                )  else { return; };
+                ) else {
+                    return;
+                };
 
                 let name = self.ty_to_value_string(actual);
                 let inner_id = kind.did();
@@ -2100,7 +2116,7 @@ pub fn suggest_derive(
             let Some(ty::PredicateKind::Clause(ty::ClauseKind::Trait(trait_pred))) =
                 pred.kind().no_bound_vars()
             else {
-                continue
+                continue;
             };
             let adt = match trait_pred.self_ty().ty_adt_def() {
                 Some(adt) if adt.did().is_local() => adt,
@@ -2197,7 +2213,9 @@ fn note_derefed_ty_has_method(
         item_name: Ident,
         expected: Expectation<'tcx>,
     ) {
-        let SelfSource::QPath(ty) = self_source else { return; };
+        let SelfSource::QPath(ty) = self_source else {
+            return;
+        };
         for (deref_ty, _) in self.autoderef(rustc_span::DUMMY_SP, rcvr_ty).skip(1) {
             if let Ok(pick) = self.probe_for_name(
                 Mode::Path,
@@ -2834,9 +2852,8 @@ pub(crate) fn suggest_else_fn_with_closure(
         found: Ty<'tcx>,
         expected: Ty<'tcx>,
     ) -> bool {
-        let Some((_def_id_or_name, output, _inputs)) =
-            self.extract_callable_info(found) else {
-                return false;
+        let Some((_def_id_or_name, output, _inputs)) = self.extract_callable_info(found) else {
+            return false;
         };
 
         if !self.can_coerce(output, expected) {

compiler/rustc_hir_typeck/src/rvalue_scopes.rs

@@ -74,9 +74,7 @@ pub fn resolve_rvalue_scopes<'a, 'tcx>(
     debug!("start resolving rvalue scopes, def_id={def_id:?}");
     debug!("rvalue_scope: rvalue_candidates={:?}", scope_tree.rvalue_candidates);
     for (&hir_id, candidate) in &scope_tree.rvalue_candidates {
-        let Some(Node::Expr(expr)) = hir_map.find(hir_id) else {
-            bug!("hir node does not exist")
-        };
+        let Some(Node::Expr(expr)) = hir_map.find(hir_id) else { bug!("hir node does not exist") };
         record_rvalue_scope(&mut rvalue_scopes, expr, candidate);
     }
     rvalue_scopes

compiler/rustc_hir_typeck/src/upvar.rs

@@ -644,7 +644,9 @@ fn compute_min_captures(
             for capture in captures {
                 match capture.info.capture_kind {
                     ty::UpvarCapture::ByRef(_) => {
-                        let PlaceBase::Upvar(upvar_id) = capture.place.base else { bug!("expected upvar") };
+                        let PlaceBase::Upvar(upvar_id) = capture.place.base else {
+                            bug!("expected upvar")
+                        };
                         let origin = UpvarRegion(upvar_id, closure_span);
                         let upvar_region = self.next_region_var(origin);
                         capture.region = Some(upvar_region);
@@ -1064,14 +1066,15 @@ fn compute_2229_migrations_for_drop(
             // ```
             debug!("no path starting from it is used");
 
-
             match closure_clause {
                 // Only migrate if closure is a move closure
                 hir::CaptureBy::Value => {
                     let mut diagnostics_info = FxHashSet::default();
-                    let upvars = self.tcx.upvars_mentioned(closure_def_id).expect("must be an upvar");
+                    let upvars =
+                        self.tcx.upvars_mentioned(closure_def_id).expect("must be an upvar");
                     let upvar = upvars[&var_hir_id];
-                    diagnostics_info.insert(UpvarMigrationInfo::CapturingNothing { use_span: upvar.span });
+                    diagnostics_info
+                        .insert(UpvarMigrationInfo::CapturingNothing { use_span: upvar.span });
                     return Some(diagnostics_info);
                 }
                 hir::CaptureBy::Ref => {}

compiler/rustc_incremental/src/persist/fs.rs

@@ -730,13 +730,13 @@ pub fn garbage_collect_session_directories(sess: &Session) -> io::Result<()> {
             debug!("garbage_collect_session_directories() - inspecting: {}", directory_name);
 
             let Ok(timestamp) = extract_timestamp_from_session_dir(directory_name) else {
-            debug!(
-                "found session-dir with malformed timestamp: {}",
-                crate_directory.join(directory_name).display()
-            );
-            // Ignore it
-            return None;
-        };
+                debug!(
+                    "found session-dir with malformed timestamp: {}",
+                    crate_directory.join(directory_name).display()
+                );
+                // Ignore it
+                return None;
+            };
 
             if is_finalized(directory_name) {
                 let lock_file_path = crate_directory.join(lock_file_name);

compiler/rustc_index/src/bit_set.rs

@@ -804,9 +804,7 @@ fn fold<B, F>(mut self, mut init: B, mut f: F) -> B
         // advance the iterator to the start of the next chunk, before proceeding in chunk sized
         // steps.
         while self.index % CHUNK_BITS != 0 {
-            let Some(item) = self.next() else {
-                return init
-            };
+            let Some(item) = self.next() else { return init };
             init = f(init, item);
         }
         let start_chunk = self.index / CHUNK_BITS;

compiler/rustc_infer/src/errors/mod.rs

@@ -363,7 +363,8 @@ fn add_to_diagnostic_with<F>(self, diag: &mut Diagnostic, _: F)
             let (
                 hir::Ty { kind: hir::TyKind::Ref(lifetime_sub, _), .. },
                 hir::Ty { kind: hir::TyKind::Ref(lifetime_sup, _), .. },
-            ) = (self.ty_sub, self.ty_sup) else {
+            ) = (self.ty_sub, self.ty_sup)
+            else {
                 return false;
             };
 

compiler/rustc_infer/src/infer/error_reporting/mod.rs

@@ -2109,14 +2109,13 @@ fn suggest_wrap_to_build_a_tuple(
         found: Ty<'tcx>,
         expected_fields: &List<Ty<'tcx>>,
     ) -> Option<TypeErrorAdditionalDiags> {
-        let [expected_tup_elem] = expected_fields[..] else { return None};
+        let [expected_tup_elem] = expected_fields[..] else { return None };
 
         if !self.same_type_modulo_infer(expected_tup_elem, found) {
             return None;
         }
 
-        let Ok(code) = self.tcx.sess().source_map().span_to_snippet(span)
-            else { return None };
+        let Ok(code) = self.tcx.sess().source_map().span_to_snippet(span) else { return None };
 
         let sugg = if code.starts_with('(') && code.ends_with(')') {
             let before_close = span.hi() - BytePos::from_u32(1);

compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs

@@ -419,7 +419,7 @@ pub fn emit_inference_failure_err(
         }
 
         let Some(InferSource { span, kind }) = local_visitor.infer_source else {
-            return self.bad_inference_failure_err(failure_span, arg_data, error_code)
+            return self.bad_inference_failure_err(failure_span, arg_data, error_code);
         };
 
         let (source_kind, name) = kind.ty_localized_msg(self);
@@ -1157,9 +1157,7 @@ fn visit_body(&mut self, body: &'tcx Body<'tcx>) {
                 continue;
             }
 
-            let Some(param_ty) = self.opt_node_type(param.hir_id) else {
-                continue
-            };
+            let Some(param_ty) = self.opt_node_type(param.hir_id) else { continue };
 
             if self.generic_arg_contains_target(param_ty.into()) {
                 self.update_infer_source(InferSource {

compiler/rustc_infer/src/infer/error_reporting/nice_region_error/mismatched_static_lifetime.rs

@@ -38,8 +38,9 @@ pub(super) fn try_report_mismatched_static_lifetime(&self) -> Option<ErrorGuaran
         let ObligationCauseCode::MatchImpl(parent, impl_def_id) = code else {
             return None;
         };
-        let (ObligationCauseCode::BindingObligation(_, binding_span) | ObligationCauseCode::ExprBindingObligation(_, binding_span, ..))
-            = *parent.code() else {
+        let (ObligationCauseCode::BindingObligation(_, binding_span)
+        | ObligationCauseCode::ExprBindingObligation(_, binding_span, ..)) = *parent.code()
+        else {
             return None;
         };
 
@@ -67,7 +68,8 @@ pub(super) fn try_report_mismatched_static_lifetime(&self) -> Option<ErrorGuaran
             let hir::Node::Item(hir::Item {
                 kind: hir::ItemKind::Impl(hir::Impl { self_ty: impl_self_ty, .. }),
                 ..
-            }) = impl_node else {
+            }) = impl_node
+            else {
                 bug!("Node not an impl.");
             };
 

compiler/rustc_infer/src/infer/error_reporting/nice_region_error/static_impl_trait.rs

@@ -503,7 +503,9 @@ fn find_impl_on_dyn_trait(
 
         // Get the `Ident` of the method being called and the corresponding `impl` (to point at
         // `Bar` in `impl Foo for dyn Bar {}` and the definition of the method being called).
-        let Some((ident, self_ty)) = NiceRegionError::get_impl_ident_and_self_ty_from_trait(tcx, instance.def_id(), &v.0) else {
+        let Some((ident, self_ty)) =
+            NiceRegionError::get_impl_ident_and_self_ty_from_trait(tcx, instance.def_id(), &v.0)
+        else {
             return false;
         };
 

compiler/rustc_infer/src/infer/error_reporting/note.rs

@@ -295,12 +295,13 @@ pub fn suggest_copy_trait_method_bounds(
         // but right now it's not really very smart when it comes to implicit `Sized`
         // predicates and bounds on the trait itself.
 
-        let Some(impl_def_id) =
-            self.tcx.associated_item(impl_item_def_id).impl_container(self.tcx) else { return; };
-        let Some(trait_ref) = self
-            .tcx
-            .impl_trait_ref(impl_def_id)
-            else { return; };
+        let Some(impl_def_id) = self.tcx.associated_item(impl_item_def_id).impl_container(self.tcx)
+        else {
+            return;
+        };
+        let Some(trait_ref) = self.tcx.impl_trait_ref(impl_def_id) else {
+            return;
+        };
         let trait_substs = trait_ref
             .subst_identity()
             // Replace the explicit self type with `Self` for better suggestion rendering
@@ -309,20 +310,25 @@ pub fn suggest_copy_trait_method_bounds(
         let trait_item_substs = ty::InternalSubsts::identity_for_item(self.tcx, impl_item_def_id)
             .rebase_onto(self.tcx, impl_def_id, trait_substs);
 
-        let Ok(trait_predicates) = self
-            .tcx
-            .explicit_predicates_of(trait_item_def_id)
-            .instantiate_own(self.tcx, trait_item_substs)
-            .map(|(pred, _)| {
-                if pred.is_suggestable(self.tcx, false) {
-                    Ok(pred.to_string())
-                } else {
-                    Err(())
-                }
-            })
-            .collect::<Result<Vec<_>, ()>>() else { return; };
+        let Ok(trait_predicates) =
+            self.tcx
+                .explicit_predicates_of(trait_item_def_id)
+                .instantiate_own(self.tcx, trait_item_substs)
+                .map(|(pred, _)| {
+                    if pred.is_suggestable(self.tcx, false) {
+                        Ok(pred.to_string())
+                    } else {
+                        Err(())
+                    }
+                })
+                .collect::<Result<Vec<_>, ()>>()
+        else {
+            return;
+        };
 
-        let Some(generics) = self.tcx.hir().get_generics(impl_item_def_id) else { return; };
+        let Some(generics) = self.tcx.hir().get_generics(impl_item_def_id) else {
+            return;
+        };
 
         let suggestion = if trait_predicates.is_empty() {
             WhereClauseSuggestions::Remove { span: generics.where_clause_span }

compiler/rustc_infer/src/infer/error_reporting/suggest.rs

@@ -526,13 +526,23 @@ pub(super) fn suggest_for_all_lifetime_closure(
         diag: &mut Diagnostic,
     ) {
         // 0. Extract fn_decl from hir
-        let hir::Node::Expr(hir::Expr { kind: hir::ExprKind::Closure(hir::Closure { body, fn_decl, .. }), .. }) = hir else { return; };
+        let hir::Node::Expr(hir::Expr {
+            kind: hir::ExprKind::Closure(hir::Closure { body, fn_decl, .. }),
+            ..
+        }) = hir
+        else {
+            return;
+        };
         let hir::Body { params, .. } = self.tcx.hir().body(*body);
 
         // 1. Get the substs of the closure.
         // 2. Assume exp_found is FnOnce / FnMut / Fn, we can extract function parameters from [1].
-        let Some(expected) = exp_found.expected.skip_binder().substs.get(1) else { return; };
-        let Some(found) = exp_found.found.skip_binder().substs.get(1) else { return; };
+        let Some(expected) = exp_found.expected.skip_binder().substs.get(1) else {
+            return;
+        };
+        let Some(found) = exp_found.found.skip_binder().substs.get(1) else {
+            return;
+        };
         let expected = expected.unpack();
         let found = found.unpack();
         // 3. Extract the tuple type from Fn trait and suggest the change.
@@ -711,7 +721,9 @@ pub fn consider_returning_binding_diag(
 
         let hir = self.tcx.hir();
         for stmt in blk.stmts.iter().rev() {
-            let hir::StmtKind::Local(local) = &stmt.kind else { continue; };
+            let hir::StmtKind::Local(local) = &stmt.kind else {
+                continue;
+            };
             local.pat.walk(&mut find_compatible_candidates);
         }
         match hir.find_parent(blk.hir_id) {

compiler/rustc_interface/src/interface.rs

@@ -190,7 +190,8 @@ macro_rules! error {
                                                 ExpectedValues::Some(FxHashSet::default())
                                             });
 
-                                        let ExpectedValues::Some(expected_values) = expected_values else {
+                                        let ExpectedValues::Some(expected_values) = expected_values
+                                        else {
                                             bug!("`expected_values` should be a list a values")
                                         };
 

compiler/rustc_lint/src/array_into_iter.rs

@@ -81,7 +81,7 @@ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'tcx>) {
             let adjustments = cx.typeck_results().expr_adjustments(receiver_arg);
 
             let Some(Adjustment { kind: Adjust::Borrow(_), target }) = adjustments.last() else {
-                return
+                return;
             };
 
             let types =

compiler/rustc_lint/src/builtin.rs

@@ -793,9 +793,7 @@ fn check_item(&mut self, cx: &LateContext<'_>, item: &hir::Item<'_>) {
             _ => return,
         }
 
-        let Some(debug) = cx.tcx.get_diagnostic_item(sym::Debug) else {
-            return
-        };
+        let Some(debug) = cx.tcx.get_diagnostic_item(sym::Debug) else { return };
 
         if self.impling_types.is_none() {
             let mut impls = LocalDefIdSet::default();
@@ -1458,9 +1456,7 @@ pub(crate) fn is_type_variable_assoc(qpath: &hir::QPath<'_>) -> bool {
 
 impl<'tcx> LateLintPass<'tcx> for TypeAliasBounds {
     fn check_item(&mut self, cx: &LateContext<'_>, item: &hir::Item<'_>) {
-        let hir::ItemKind::TyAlias(ty, type_alias_generics) = &item.kind else {
-            return
-        };
+        let hir::ItemKind::TyAlias(ty, type_alias_generics) = &item.kind else { return };
         if cx.tcx.type_of(item.owner_id.def_id).skip_binder().has_opaque_types() {
             // Bounds are respected for `type X = impl Trait` and `type X = (impl Trait, Y);`
             return;
@@ -2147,8 +2143,8 @@ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx hir::Item<'_>) {
                             match predicate.bounded_ty.kind {
                                 hir::TyKind::Path(hir::QPath::Resolved(None, path)) => {
                                     let Res::Def(DefKind::TyParam, def_id) = path.res else {
-                                    continue;
-                                };
+                                        continue;
+                                    };
                                     let index = ty_generics.param_def_id_to_index[&def_id];
                                     (
                                         Self::lifetimes_outliving_type(inferred_outlives, index),
@@ -2570,7 +2566,10 @@ fn ty_find_init_error<'tcx>(
                         Some((variant, definitely_inhabited))
                     });
                     let Some(first_variant) = potential_variants.next() else {
-                        return Some(InitError::from("enums with no inhabited variants have no valid value").spanned(span));
+                        return Some(
+                            InitError::from("enums with no inhabited variants have no valid value")
+                                .spanned(span),
+                        );
                     };
                     // So we have at least one potentially inhabited variant. Might we have two?
                     let Some(second_variant) = potential_variants.next() else {
@@ -3181,7 +3180,7 @@ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'tcx>) {
                         let mut chars = possible_label.chars();
                         let Some(c) = chars.next() else {
                             // Empty string means a leading ':' in this section, which is not a label
-                            break
+                            break;
                         };
                         // A label starts with an alphabetic character or . or _ and continues with alphanumeric characters, _, or $
                         if (c.is_alphabetic() || matches!(c, '.' | '_'))

compiler/rustc_lint/src/cast_ref_to_mut.rs

@@ -37,7 +37,9 @@
 
 impl<'tcx> LateLintPass<'tcx> for CastRefToMut {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
-        let ExprKind::Unary(UnOp::Deref, e) = &expr.kind else { return; };
+        let ExprKind::Unary(UnOp::Deref, e) = &expr.kind else {
+            return;
+        };
 
         let e = e.peel_blocks();
         let e = if let ExprKind::Cast(e, t) = e.kind

compiler/rustc_lint/src/for_loops_over_fallibles.rs

@@ -119,7 +119,9 @@ fn suggest_question_mark<'tcx>(
     span: Span,
 ) -> bool {
     let Some(body_id) = cx.enclosing_body else { return false };
-    let Some(into_iterator_did) = cx.tcx.get_diagnostic_item(sym::IntoIterator) else { return false };
+    let Some(into_iterator_did) = cx.tcx.get_diagnostic_item(sym::IntoIterator) else {
+        return false;
+    };
 
     if !cx.tcx.is_diagnostic_item(sym::Result, adt.did()) {
         return false;

compiler/rustc_lint/src/levels.rs

@@ -265,7 +265,10 @@ fn get_lint_level(&self, lint: &'static Lint, _: &Session) -> LevelAndSource {
         self.specs.lint_level_id_at_node(self.tcx, LintId::of(lint), self.cur)
     }
     fn push_expectation(&mut self, id: LintExpectationId, expectation: LintExpectation) {
-        let LintExpectationId::Stable { attr_id: Some(attr_id), hir_id, attr_index, .. } = id else { bug!("unstable expectation id should already be mapped") };
+        let LintExpectationId::Stable { attr_id: Some(attr_id), hir_id, attr_index, .. } = id
+        else {
+            bug!("unstable expectation id should already be mapped")
+        };
         let key = LintExpectationId::Unstable { attr_id, lint_index: None };
 
         self.unstable_to_stable_ids.entry(key).or_insert(LintExpectationId::Stable {
@@ -542,7 +545,7 @@ fn add_command_line(&mut self) {
 
             let Ok(ids) = self.store.find_lints(&lint_name) else {
                 // errors handled in check_lint_name_cmdline above
-                continue
+                continue;
             };
             for id in ids {
                 // ForceWarn and Forbid cannot be overridden
@@ -685,9 +688,7 @@ fn add(&mut self, attrs: &[ast::Attribute], is_crate_node: bool, source_hir_id:
                 Some(lvl) => lvl,
             };
 
-            let Some(mut metas) = attr.meta_item_list() else {
-                continue
-            };
+            let Some(mut metas) = attr.meta_item_list() else { continue };
 
             if metas.is_empty() {
                 // This emits the unused_attributes lint for `#[level()]`
@@ -956,8 +957,9 @@ fn add(&mut self, attrs: &[ast::Attribute], is_crate_node: bool, source_hir_id:
                     continue;
                 }
 
-                let LintLevelSource::Node { name: lint_attr_name, span: lint_attr_span, .. } = *src else {
-                    continue
+                let LintLevelSource::Node { name: lint_attr_name, span: lint_attr_span, .. } = *src
+                else {
+                    continue;
                 };
 
                 self.emit_spanned_lint(

compiler/rustc_lint/src/noop_method_call.rs

@@ -79,8 +79,7 @@ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
         // We only care about method calls corresponding to the `Clone`, `Deref` and `Borrow`
         // traits and ignore any other method call.
 
-        let Some((DefKind::AssocFn, did)) =
-            cx.typeck_results().type_dependent_def(expr.hir_id)
+        let Some((DefKind::AssocFn, did)) = cx.typeck_results().type_dependent_def(expr.hir_id)
         else {
             return;
         };
@@ -98,9 +97,7 @@ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
             .tcx
             .normalize_erasing_regions(cx.param_env, cx.typeck_results().node_substs(expr.hir_id));
         // Resolve the trait method instance.
-        let Ok(Some(i)) = ty::Instance::resolve(cx.tcx, cx.param_env, did, substs) else {
-            return
-        };
+        let Ok(Some(i)) = ty::Instance::resolve(cx.tcx, cx.param_env, did, substs) else { return };
         // (Re)check that it implements the noop diagnostic.
         let Some(name) = cx.tcx.get_diagnostic_name(i.def_id()) else { return };
 

compiler/rustc_lint/src/opaque_hidden_inferred_bound.rs

@@ -68,7 +68,9 @@
 
 impl<'tcx> LateLintPass<'tcx> for OpaqueHiddenInferredBound {
     fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx hir::Item<'tcx>) {
-        let hir::ItemKind::OpaqueTy(opaque) = &item.kind else { return; };
+        let hir::ItemKind::OpaqueTy(opaque) = &item.kind else {
+            return;
+        };
         let def_id = item.owner_id.def_id.to_def_id();
         let infcx = &cx.tcx.infer_ctxt().build();
         // For every projection predicate in the opaque type's explicit bounds,
@@ -116,7 +118,12 @@ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx hir::Item<'tcx>) {
                 .subst_iter_copied(cx.tcx, &proj.projection_ty.substs)
             {
                 let assoc_pred = assoc_pred.fold_with(proj_replacer);
-                let Ok(assoc_pred) = traits::fully_normalize(infcx, traits::ObligationCause::dummy(), cx.param_env, assoc_pred) else {
+                let Ok(assoc_pred) = traits::fully_normalize(
+                    infcx,
+                    traits::ObligationCause::dummy(),
+                    cx.param_env,
+                    assoc_pred,
+                ) else {
                     continue;
                 };
                 // If that predicate doesn't hold modulo regions (but passed during type-check),

compiler/rustc_lint/src/traits.rs

@@ -92,7 +92,7 @@ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx hir::Item<'tcx>) {
         let predicates = cx.tcx.explicit_predicates_of(item.owner_id);
         for &(predicate, span) in predicates.predicates {
             let ClauseKind::Trait(trait_predicate) = predicate.kind().skip_binder() else {
-                continue
+                continue;
             };
             let def_id = trait_predicate.trait_ref.def_id;
             if cx.tcx.lang_items().drop_trait() == Some(def_id) {
@@ -100,9 +100,7 @@ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx hir::Item<'tcx>) {
                 if trait_predicate.trait_ref.self_ty().is_impl_trait() {
                     continue;
                 }
-                let Some(def_id) = cx.tcx.get_diagnostic_item(sym::needs_drop) else {
-                    return
-                };
+                let Some(def_id) = cx.tcx.get_diagnostic_item(sym::needs_drop) else { return };
                 cx.emit_spanned_lint(
                     DROP_BOUNDS,
                     span,
@@ -113,15 +111,11 @@ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx hir::Item<'tcx>) {
     }
 
     fn check_ty(&mut self, cx: &LateContext<'_>, ty: &'tcx hir::Ty<'tcx>) {
-        let hir::TyKind::TraitObject(bounds, _lifetime, _syntax) = &ty.kind else {
-            return
-        };
+        let hir::TyKind::TraitObject(bounds, _lifetime, _syntax) = &ty.kind else { return };
         for bound in &bounds[..] {
             let def_id = bound.trait_ref.trait_def_id();
             if cx.tcx.lang_items().drop_trait() == def_id {
-                let Some(def_id) = cx.tcx.get_diagnostic_item(sym::needs_drop) else {
-                    return
-                };
+                let Some(def_id) = cx.tcx.get_diagnostic_item(sym::needs_drop) else { return };
                 cx.emit_spanned_lint(DYN_DROP, bound.span, DropGlue { tcx: cx.tcx, def_id });
             }
         }

compiler/rustc_lint/src/types.rs

@@ -560,7 +560,10 @@ fn is_nan(cx: &LateContext<'_>, expr: &hir::Expr<'_>) -> bool {
         let expr = expr.peel_blocks().peel_borrows();
         match expr.kind {
             ExprKind::Path(qpath) => {
-                let Some(def_id) = cx.typeck_results().qpath_res(&qpath, expr.hir_id).opt_def_id() else { return false; };
+                let Some(def_id) = cx.typeck_results().qpath_res(&qpath, expr.hir_id).opt_def_id()
+                else {
+                    return false;
+                };
 
                 matches!(cx.tcx.get_diagnostic_name(def_id), Some(sym::f32_nan | sym::f64_nan))
             }
@@ -1584,10 +1587,10 @@ fn check_item(&mut self, cx: &LateContext<'_>, it: &hir::Item<'_>) {
             let t = cx.tcx.type_of(it.owner_id).subst_identity();
             let ty = cx.tcx.erase_regions(t);
             let Ok(layout) = cx.layout_of(ty) else { return };
-            let Variants::Multiple {
-                    tag_encoding: TagEncoding::Direct, tag, ref variants, ..
-                } = &layout.variants else {
-                return
+            let Variants::Multiple { tag_encoding: TagEncoding::Direct, tag, ref variants, .. } =
+                &layout.variants
+            else {
+                return;
             };
 
             let tag_size = tag.size(&cx.tcx).bytes();
@@ -1760,8 +1763,13 @@ fn check_memory_fence(cx: &LateContext<'_>, expr: &Expr<'_>) {
     }
 
     fn check_atomic_compare_exchange(cx: &LateContext<'_>, expr: &Expr<'_>) {
-        let Some((method, args)) = Self::inherent_atomic_method_call(cx, expr, &[sym::fetch_update, sym::compare_exchange, sym::compare_exchange_weak])
-            else {return };
+        let Some((method, args)) = Self::inherent_atomic_method_call(
+            cx,
+            expr,
+            &[sym::fetch_update, sym::compare_exchange, sym::compare_exchange_weak],
+        ) else {
+            return;
+        };
 
         let fail_order_arg = match method {
             sym::fetch_update => &args[1],

compiler/rustc_lint/src/unused.rs

@@ -94,7 +94,9 @@
 
 impl<'tcx> LateLintPass<'tcx> for UnusedResults {
     fn check_stmt(&mut self, cx: &LateContext<'_>, s: &hir::Stmt<'_>) {
-        let hir::StmtKind::Semi(mut expr) = s.kind else { return; };
+        let hir::StmtKind::Semi(mut expr) = s.kind else {
+            return;
+        };
 
         let mut expr_is_from_block = false;
         while let hir::ExprKind::Block(blk, ..) = expr.kind

compiler/rustc_macros/src/diagnostics/diagnostic_builder.rs

@@ -203,14 +203,18 @@ fn generate_structure_code_for_attr(
                 if first && (nested.input.is_empty() || nested.input.peek(Token![,])) {
                     self.slug.set_once(path.clone(), path.span().unwrap());
                     first = false;
-                    return Ok(())
+                    return Ok(());
                 }
 
                 first = false;
 
                 let Ok(nested) = nested.value() else {
-                    span_err(nested.input.span().unwrap(), "diagnostic slug must be the first argument").emit();
-                    return Ok(())
+                    span_err(
+                        nested.input.span().unwrap(),
+                        "diagnostic slug must be the first argument",
+                    )
+                    .emit();
+                    return Ok(());
                 };
 
                 if path.is_ident("code") {
@@ -221,7 +225,9 @@ fn generate_structure_code_for_attr(
                         #diag.code(rustc_errors::DiagnosticId::Error(#code.to_string()));
                     });
                 } else {
-                    span_err(path.span().unwrap(), "unknown argument").note("only the `code` parameter is valid after the slug").emit();
+                    span_err(path.span().unwrap(), "unknown argument")
+                        .note("only the `code` parameter is valid after the slug")
+                        .emit();
 
                     // consume the buffer so we don't have syntax errors from syn
                     let _ = nested.parse::<TokenStream>();

compiler/rustc_macros/src/diagnostics/subdiagnostic.rs

@@ -188,7 +188,9 @@ fn identify_kind(
         let mut kind_slugs = vec![];
 
         for attr in self.variant.ast().attrs {
-            let Some(SubdiagnosticVariant { kind, slug, no_span }) = SubdiagnosticVariant::from_attr(attr, self)? else {
+            let Some(SubdiagnosticVariant { kind, slug, no_span }) =
+                SubdiagnosticVariant::from_attr(attr, self)?
+            else {
                 // Some attributes aren't errors - like documentation comments - but also aren't
                 // subdiagnostics.
                 continue;

compiler/rustc_macros/src/newtype.rs

@@ -36,7 +36,8 @@ fn parse(input: ParseStream<'_>) -> Result<Self> {
                     false
                 }
                 "max" => {
-                    let Meta::NameValue(MetaNameValue { value: Expr::Lit(lit), .. }) = &attr.meta else {
+                    let Meta::NameValue(MetaNameValue { value: Expr::Lit(lit), .. }) = &attr.meta
+                    else {
                         panic!("#[max = NUMBER] attribute requires max value");
                     };
 
@@ -47,7 +48,8 @@ fn parse(input: ParseStream<'_>) -> Result<Self> {
                     false
                 }
                 "debug_format" => {
-                    let Meta::NameValue(MetaNameValue { value: Expr::Lit(lit), .. }) = &attr.meta else {
+                    let Meta::NameValue(MetaNameValue { value: Expr::Lit(lit), .. }) = &attr.meta
+                    else {
                         panic!("#[debug_format = FMT] attribute requires a format");
                     };
 

compiler/rustc_metadata/src/creader.rs

@@ -741,7 +741,9 @@ fn inject_panic_runtime(&mut self, krate: &ast::Crate) {
         };
         info!("panic runtime not found -- loading {}", name);
 
-        let Some(cnum) = self.resolve_crate(name, DUMMY_SP, CrateDepKind::Implicit) else { return; };
+        let Some(cnum) = self.resolve_crate(name, DUMMY_SP, CrateDepKind::Implicit) else {
+            return;
+        };
         let data = self.cstore.get_crate_data(cnum);
 
         // Sanity check the loaded crate to ensure it is indeed a panic runtime
@@ -774,7 +776,9 @@ fn inject_profiler_runtime(&mut self, krate: &ast::Crate) {
             self.sess.emit_err(errors::ProfilerBuiltinsNeedsCore);
         }
 
-        let Some(cnum) = self.resolve_crate(name, DUMMY_SP, CrateDepKind::Implicit) else { return; };
+        let Some(cnum) = self.resolve_crate(name, DUMMY_SP, CrateDepKind::Implicit) else {
+            return;
+        };
         let data = self.cstore.get_crate_data(cnum);
 
         // Sanity check the loaded crate to ensure it is indeed a profiler runtime

compiler/rustc_metadata/src/locator.rs

@@ -804,8 +804,12 @@ fn get_metadata_section<'p>(
             }
 
             // Length of the compressed stream - this allows linkers to pad the section if they want
-            let Ok(len_bytes) = <[u8; 4]>::try_from(&buf[header_len..cmp::min(data_start, buf.len())]) else {
-                return Err(MetadataError::LoadFailure("invalid metadata length found".to_string()));
+            let Ok(len_bytes) =
+                <[u8; 4]>::try_from(&buf[header_len..cmp::min(data_start, buf.len())])
+            else {
+                return Err(MetadataError::LoadFailure(
+                    "invalid metadata length found".to_string(),
+                ));
             };
             let compressed_len = u32::from_be_bytes(len_bytes) as usize;
 

compiler/rustc_metadata/src/rmeta/decoder.rs

@@ -311,8 +311,10 @@ impl<'a, 'tcx> DecodeContext<'a, 'tcx> {
     #[inline]
     fn tcx(&self) -> TyCtxt<'tcx> {
         let Some(tcx) = self.tcx else {
-            bug!("No TyCtxt found for decoding. \
-                You need to explicitly pass `(crate_metadata_ref, tcx)` to `decode` instead of just `crate_metadata_ref`.");
+            bug!(
+                "No TyCtxt found for decoding. \
+                You need to explicitly pass `(crate_metadata_ref, tcx)` to `decode` instead of just `crate_metadata_ref`."
+            );
         };
         tcx
     }
@@ -448,8 +450,10 @@ fn decode(decoder: &mut DecodeContext<'a, 'tcx>) -> SyntaxContext {
         let cdata = decoder.cdata();
 
         let Some(sess) = decoder.sess else {
-            bug!("Cannot decode SyntaxContext without Session.\
-                You need to explicitly pass `(crate_metadata_ref, tcx)` to `decode` instead of just `crate_metadata_ref`.");
+            bug!(
+                "Cannot decode SyntaxContext without Session.\
+                You need to explicitly pass `(crate_metadata_ref, tcx)` to `decode` instead of just `crate_metadata_ref`."
+            );
         };
 
         let cname = cdata.root.name();
@@ -470,8 +474,10 @@ fn decode(decoder: &mut DecodeContext<'a, 'tcx>) -> ExpnId {
         let local_cdata = decoder.cdata();
 
         let Some(sess) = decoder.sess else {
-            bug!("Cannot decode ExpnId without Session. \
-                You need to explicitly pass `(crate_metadata_ref, tcx)` to `decode` instead of just `crate_metadata_ref`.");
+            bug!(
+                "Cannot decode ExpnId without Session. \
+                You need to explicitly pass `(crate_metadata_ref, tcx)` to `decode` instead of just `crate_metadata_ref`."
+            );
         };
 
         let cnum = CrateNum::decode(decoder);
@@ -521,8 +527,10 @@ fn decode(decoder: &mut DecodeContext<'a, 'tcx>) -> Span {
         let hi = lo + len;
 
         let Some(sess) = decoder.sess else {
-            bug!("Cannot decode Span without Session. \
-                You need to explicitly pass `(crate_metadata_ref, tcx)` to `decode` instead of just `crate_metadata_ref`.")
+            bug!(
+                "Cannot decode Span without Session. \
+                You need to explicitly pass `(crate_metadata_ref, tcx)` to `decode` instead of just `crate_metadata_ref`."
+            )
         };
 
         // Index of the file in the corresponding crate's list of encoded files.

compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -1671,7 +1671,9 @@ fn encode_rendered_const_for_body(&mut self, body_id: hir::BodyId) -> String {
     fn encode_info_for_macro(&mut self, def_id: LocalDefId) {
         let tcx = self.tcx;
 
-        let hir::ItemKind::Macro(ref macro_def, _) = tcx.hir().expect_item(def_id).kind else { bug!() };
+        let hir::ItemKind::Macro(ref macro_def, _) = tcx.hir().expect_item(def_id).kind else {
+            bug!()
+        };
         self.tables.is_macro_rules.set(def_id.local_def_index, macro_def.macro_rules);
         record!(self.tables.macro_definition[def_id.to_def_id()] <- &*macro_def.body);
     }
@@ -1911,7 +1913,9 @@ fn encode_impls(&mut self) -> LazyArray<TraitImpls> {
             FxHashMap::default();
 
         for id in tcx.hir().items() {
-            let DefKind::Impl { of_trait } = tcx.def_kind(id.owner_id) else { continue; };
+            let DefKind::Impl { of_trait } = tcx.def_kind(id.owner_id) else {
+                continue;
+            };
             let def_id = id.owner_id.to_def_id();
 
             self.tables.defaultness.set_some(def_id.index, tcx.defaultness(def_id));

compiler/rustc_metadata/src/rmeta/table.rs

@@ -323,7 +323,7 @@ impl<T> FixedSizeEncoding for Option<LazyValue<T>> {
 impl<T> LazyArray<T> {
     #[inline]
     fn write_to_bytes_impl(self, b: &mut [u8; 8]) {
-        let ([position_bytes, meta_bytes],[])= b.as_chunks_mut::<4>() else { panic!() };
+        let ([position_bytes, meta_bytes], []) = b.as_chunks_mut::<4>() else { panic!() };
 
         let position = self.position.get();
         let position: u32 = position.try_into().unwrap();
@@ -346,7 +346,7 @@ impl<T> FixedSizeEncoding for LazyArray<T> {
 
     #[inline]
     fn from_bytes(b: &[u8; 8]) -> Self {
-        let ([position_bytes, meta_bytes],[])= b.as_chunks::<4>() else { panic!() };
+        let ([position_bytes, meta_bytes], []) = b.as_chunks::<4>() else { panic!() };
         if *meta_bytes == [0; 4] {
             return Default::default();
         }
@@ -365,7 +365,7 @@ impl<T> FixedSizeEncoding for Option<LazyArray<T>> {
 
     #[inline]
     fn from_bytes(b: &[u8; 8]) -> Self {
-        let ([position_bytes, meta_bytes],[])= b.as_chunks::<4>() else { panic!() };
+        let ([position_bytes, meta_bytes], []) = b.as_chunks::<4>() else { panic!() };
         LazyArray::from_bytes_impl(position_bytes, meta_bytes)
     }
 

compiler/rustc_middle/src/ty/consts/int.rs

@@ -418,7 +418,7 @@ impl TryFrom<ScalarInt> for char {
 
     #[inline]
     fn try_from(int: ScalarInt) -> Result<Self, Self::Error> {
-        let Ok(bits) = int.to_bits(Size::from_bytes(std::mem::size_of::<char>())) else  {
+        let Ok(bits) = int.to_bits(Size::from_bytes(std::mem::size_of::<char>())) else {
             return Err(CharTryFromScalarInt);
         };
         match char::from_u32(bits.try_into().unwrap()) {

compiler/rustc_middle/src/ty/mod.rs

@@ -2713,12 +2713,16 @@ pub fn impl_method_has_trait_impl_trait_tys(self, def_id: DefId) -> bool {
             return false;
         }
 
-        let Some(item) = self.opt_associated_item(def_id) else { return false; };
+        let Some(item) = self.opt_associated_item(def_id) else {
+            return false;
+        };
         if item.container != ty::AssocItemContainer::ImplContainer {
             return false;
         }
 
-        let Some(trait_item_def_id) = item.trait_item_def_id else { return false; };
+        let Some(trait_item_def_id) = item.trait_item_def_id else {
+            return false;
+        };
 
         return !self
             .associated_types_for_impl_traits_in_associated_fn(trait_item_def_id)

compiler/rustc_middle/src/ty/util.rs

@@ -358,7 +358,8 @@ pub fn calculate_dtor(
             }
 
             let Some(item_id) = self.associated_item_def_ids(impl_did).first() else {
-                self.sess.delay_span_bug(self.def_span(impl_did), "Drop impl without drop function");
+                self.sess
+                    .delay_span_bug(self.def_span(impl_did), "Drop impl without drop function");
                 return;
             };
 

compiler/rustc_mir_build/src/build/custom/parse.rs

@@ -241,9 +241,7 @@ fn parse_block_def(&self, expr_id: ExprId) -> PResult<BasicBlockData<'tcx>> {
             });
         }
 
-        let Some(trailing) = block.expr else {
-            return Err(self.expr_error(expr_id, "terminator"))
-        };
+        let Some(trailing) = block.expr else { return Err(self.expr_error(expr_id, "terminator")) };
         let span = self.thir[trailing].span;
         let terminator = self.parse_terminator(trailing)?;
         data.terminator = Some(Terminator {

compiler/rustc_mir_build/src/build/custom/parse/instruction.rs

@@ -78,7 +78,7 @@ fn parse_match(&self, arms: &[ArmId], span: Span) -> PResult<SwitchTargets> {
                 span,
                 item_description: "no arms".to_string(),
                 expected: "at least one arm".to_string(),
-            })
+            });
         };
 
         let otherwise = &self.thir[*otherwise];
@@ -87,7 +87,7 @@ fn parse_match(&self, arms: &[ArmId], span: Span) -> PResult<SwitchTargets> {
                 span: otherwise.span,
                 item_description: format!("{:?}", otherwise.pattern.kind),
                 expected: "wildcard pattern".to_string(),
-            })
+            });
         };
         let otherwise = self.parse_block(otherwise.body)?;
 
@@ -100,7 +100,7 @@ fn parse_match(&self, arms: &[ArmId], span: Span) -> PResult<SwitchTargets> {
                     span: arm.pattern.span,
                     item_description: format!("{:?}", arm.pattern.kind),
                     expected: "constant pattern".to_string(),
-                })
+                });
             };
             values.push(value.eval_bits(self.tcx, self.param_env, arm.pattern.ty));
             targets.push(self.parse_block(arm.body)?);

compiler/rustc_mir_build/src/build/expr/as_place.rs

@@ -175,11 +175,8 @@ fn to_upvars_resolved_place_builder<'tcx>(
     projection: &[PlaceElem<'tcx>],
 ) -> Option<PlaceBuilder<'tcx>> {
     let Some((capture_index, capture)) =
-        find_capture_matching_projections(
-            &cx.upvars,
-            var_hir_id,
-            &projection,
-        ) else {
+        find_capture_matching_projections(&cx.upvars, var_hir_id, &projection)
+    else {
         let closure_span = cx.tcx.def_span(closure_def_id);
         if !enable_precise_capture(closure_span) {
             bug!(
@@ -189,10 +186,7 @@ fn to_upvars_resolved_place_builder<'tcx>(
                 projection
             )
         } else {
-            debug!(
-                "No associated capture found for {:?}[{:#?}]",
-                var_hir_id, projection,
-            );
+            debug!("No associated capture found for {:?}[{:#?}]", var_hir_id, projection,);
         }
         return None;
     };

compiler/rustc_mir_build/src/build/matches/mod.rs

@@ -607,9 +607,11 @@ pub(crate) fn place_into_pattern(
                     // };
                     // ```
                     if let Some(place) = initializer.try_to_place(self) {
-                        let LocalInfo::User(BindingForm::Var(
-                            VarBindingForm { opt_match_place: Some((ref mut match_place, _)), .. },
-                        )) = **self.local_decls[local].local_info.as_mut().assert_crate_local() else {
+                        let LocalInfo::User(BindingForm::Var(VarBindingForm {
+                            opt_match_place: Some((ref mut match_place, _)),
+                            ..
+                        })) = **self.local_decls[local].local_info.as_mut().assert_crate_local()
+                        else {
                             bug!("Let binding to non-user variable.")
                         };
                         *match_place = Some(place);

compiler/rustc_mir_build/src/build/matches/test.rs

@@ -88,7 +88,8 @@ pub(super) fn add_cases_to_switch<'pat>(
         switch_ty: Ty<'tcx>,
         options: &mut FxIndexMap<ConstantKind<'tcx>, u128>,
     ) -> bool {
-        let Some(match_pair) = candidate.match_pairs.iter().find(|mp| mp.place == *test_place) else {
+        let Some(match_pair) = candidate.match_pairs.iter().find(|mp| mp.place == *test_place)
+        else {
             return false;
         };
 
@@ -126,7 +127,8 @@ pub(super) fn add_variants_to_switch<'pat>(
         candidate: &Candidate<'pat, 'tcx>,
         variants: &mut BitSet<VariantIdx>,
     ) -> bool {
-        let Some(match_pair) = candidate.match_pairs.iter().find(|mp| mp.place == *test_place) else {
+        let Some(match_pair) = candidate.match_pairs.iter().find(|mp| mp.place == *test_place)
+        else {
             return false;
         };
 

compiler/rustc_mir_build/src/check_unsafety.rs

@@ -712,9 +712,7 @@ pub fn thir_check_unsafety(tcx: TyCtxt<'_>, def: LocalDefId) {
         return;
     }
 
-    let Ok((thir, expr)) = tcx.thir_body(def) else {
-        return
-    };
+    let Ok((thir, expr)) = tcx.thir_body(def) else { return };
     let thir = &thir.borrow();
     // If `thir` is empty, a type error occurred, skip this body.
     if thir.exprs.is_empty() {

compiler/rustc_mir_build/src/thir/pattern/check_match.rs

@@ -942,7 +942,9 @@ fn maybe_point_at_variant<'a, 'p: 'a, 'tcx: 'a>(
 /// This analysis is *not* subsumed by NLL.
 fn check_borrow_conflicts_in_at_patterns<'tcx>(cx: &MatchVisitor<'_, '_, 'tcx>, pat: &Pat<'tcx>) {
     // Extract `sub` in `binding @ sub`.
-    let PatKind::Binding { name, mode, ty, subpattern: Some(box ref sub), .. } = pat.kind else { return };
+    let PatKind::Binding { name, mode, ty, subpattern: Some(box ref sub), .. } = pat.kind else {
+        return;
+    };
 
     let is_binding_by_move = |ty: Ty<'tcx>| !ty.is_copy_modulo_regions(cx.tcx, cx.param_env);
 

compiler/rustc_mir_dataflow/src/impls/mod.rs

@@ -321,7 +321,9 @@ fn statement_effect(
 
         // Mark all places as "maybe init" if they are mutably borrowed. See #90752.
         for_each_mut_borrow(statement, location, |place| {
-            let LookupResult::Exact(mpi) = self.move_data().rev_lookup.find(place.as_ref()) else { return };
+            let LookupResult::Exact(mpi) = self.move_data().rev_lookup.find(place.as_ref()) else {
+                return;
+            };
             on_all_children_bits(self.tcx, self.body, self.move_data(), mpi, |child| {
                 trans.gen(child);
             })
@@ -343,7 +345,9 @@ fn terminator_effect(
         }
 
         for_each_mut_borrow(terminator, location, |place| {
-            let LookupResult::Exact(mpi) = self.move_data().rev_lookup.find(place.as_ref()) else { return };
+            let LookupResult::Exact(mpi) = self.move_data().rev_lookup.find(place.as_ref()) else {
+                return;
+            };
             on_all_children_bits(self.tcx, self.body, self.move_data(), mpi, |child| {
                 trans.gen(child);
             })

compiler/rustc_mir_transform/src/copy_prop.rs

@@ -76,9 +76,11 @@ fn fully_moved_locals(ssa: &SsaLocals, body: &Body<'_>) -> BitSet<Local> {
     let mut fully_moved = BitSet::new_filled(body.local_decls.len());
 
     for (_, rvalue, _) in ssa.assignments(body) {
-        let (Rvalue::Use(Operand::Copy(place) | Operand::Move(place)) | Rvalue::CopyForDeref(place))
-            = rvalue
-        else { continue };
+        let (Rvalue::Use(Operand::Copy(place) | Operand::Move(place))
+        | Rvalue::CopyForDeref(place)) = rvalue
+        else {
+            continue;
+        };
 
         let Some(rhs) = place.as_local() else { continue };
         if !ssa.is_ssa(rhs) {

compiler/rustc_mir_transform/src/dataflow_const_prop.rs

@@ -281,7 +281,7 @@ fn handle_switch_int(
 
             let FlatSet::Elem(choice) = discr_value else {
                 // Do nothing if we don't know which branch will be taken.
-                return
+                return;
             };
 
             if target.value.map(|n| n == choice).unwrap_or(!handled) {