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Rollup merge of #93046 - est31:let_else, r=davidtwco

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Use let_else in even more places

Followup of #89933, #91018, #91481.
This commit is contained in:
Matthias Krüger 2022-01-21 22:03:17 +01:00 committed by GitHub
parent 1f3a2dd0b1 b2dd1377c7
commit ab19d4a515
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GPG key ID: 4AEE18F83AFDEB23
9 changed files with 134 additions and 140 deletions
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2
compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs
View file

@ -1493,7 +1493,7 @@ fn generator_layout_and_saved_local_names<'tcx>(
let state_arg = mir::Local::new(1);
for var in &body.var_debug_info {
let place = if let mir::VarDebugInfoContents::Place(p) = var.value { p } else { continue };
let mir::VarDebugInfoContents::Place(place) = &var.value else { continue };
if place.local != state_arg {
continue;
}

1
compiler/rustc_codegen_llvm/src/lib.rs
View file

@ -7,6 +7,7 @@
#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
#![feature(bool_to_option)]
#![feature(crate_visibility_modifier)]
#![feature(let_else)]
#![feature(extern_types)]
#![feature(nll)]
#![recursion_limit = "256"]

1
compiler/rustc_interface/src/lib.rs
View file

@ -1,5 +1,6 @@
#![feature(bool_to_option)]
#![feature(box_patterns)]
#![feature(let_else)]
#![feature(internal_output_capture)]
#![feature(thread_spawn_unchecked)]
#![feature(nll)]

94
compiler/rustc_interface/src/util.rs
View file

@ -717,57 +717,57 @@ fn run<R, F: FnOnce(&mut Self) -> R>(&mut self, is_const: bool, action: F) -> R
}
fn should_ignore_fn(ret_ty: &ast::FnRetTy) -> bool {
if let ast::FnRetTy::Ty(ref ty) = ret_ty {
fn involves_impl_trait(ty: &ast::Ty) -> bool {
match ty.kind {
ast::TyKind::ImplTrait(..) => true,
ast::TyKind::Slice(ref subty)
| ast::TyKind::Array(ref subty, _)
| ast::TyKind::Ptr(ast::MutTy { ty: ref subty, .. })
| ast::TyKind::Rptr(_, ast::MutTy { ty: ref subty, .. })
| ast::TyKind::Paren(ref subty) => involves_impl_trait(subty),
ast::TyKind::Tup(ref tys) => any_involves_impl_trait(tys.iter()),
ast::TyKind::Path(_, ref path) => {
path.segments.iter().any(|seg| match seg.args.as_deref() {
None => false,
Some(&ast::GenericArgs::AngleBracketed(ref data)) => {
data.args.iter().any(|arg| match arg {
ast::AngleBracketedArg::Arg(arg) => match arg {
ast::GenericArg::Type(ty) => involves_impl_trait(ty),
ast::GenericArg::Lifetime(_)
| ast::GenericArg::Const(_) => false,
},
ast::AngleBracketedArg::Constraint(c) => match c.kind {
ast::AssocConstraintKind::Bound { .. } => true,
ast::AssocConstraintKind::Equality { ref term } => {
match term {
Term::Ty(ty) => involves_impl_trait(ty),
// FIXME(...): This should check if the constant
// involves a trait impl, but for now ignore.
Term::Const(_) => false,
}
let ast::FnRetTy::Ty(ref ty) = ret_ty else {
return false;
};
fn involves_impl_trait(ty: &ast::Ty) -> bool {
match ty.kind {
ast::TyKind::ImplTrait(..) => true,
ast::TyKind::Slice(ref subty)
| ast::TyKind::Array(ref subty, _)
| ast::TyKind::Ptr(ast::MutTy { ty: ref subty, .. })
| ast::TyKind::Rptr(_, ast::MutTy { ty: ref subty, .. })
| ast::TyKind::Paren(ref subty) => involves_impl_trait(subty),
ast::TyKind::Tup(ref tys) => any_involves_impl_trait(tys.iter()),
ast::TyKind::Path(_, ref path) => {
path.segments.iter().any(|seg| match seg.args.as_deref() {
None => false,
Some(&ast::GenericArgs::AngleBracketed(ref data)) => {
data.args.iter().any(|arg| match arg {
ast::AngleBracketedArg::Arg(arg) => match arg {
ast::GenericArg::Type(ty) => involves_impl_trait(ty),
ast::GenericArg::Lifetime(_) | ast::GenericArg::Const(_) => {
false
}
},
ast::AngleBracketedArg::Constraint(c) => match c.kind {
ast::AssocConstraintKind::Bound { .. } => true,
ast::AssocConstraintKind::Equality { ref term } => {
match term {
Term::Ty(ty) => involves_impl_trait(ty),
// FIXME(...): This should check if the constant
// involves a trait impl, but for now ignore.
Term::Const(_) => false,
}
},
})
}
Some(&ast::GenericArgs::Parenthesized(ref data)) => {
any_involves_impl_trait(data.inputs.iter())
|| ReplaceBodyWithLoop::should_ignore_fn(&data.output)
}
})
}
_ => false,
}
},
})
}
Some(&ast::GenericArgs::Parenthesized(ref data)) => {
any_involves_impl_trait(data.inputs.iter())
|| ReplaceBodyWithLoop::should_ignore_fn(&data.output)
}
})
}
_ => false,
}
fn any_involves_impl_trait<'a, I: Iterator<Item = &'a P<ast::Ty>>>(mut it: I) -> bool {
it.any(|subty| involves_impl_trait(subty))
}
involves_impl_trait(ty)
} else {
false
}
fn any_involves_impl_trait<'a, I: Iterator<Item = &'a P<ast::Ty>>>(mut it: I) -> bool {
it.any(|subty| involves_impl_trait(subty))
}
involves_impl_trait(ty)
}
fn is_sig_const(sig: &ast::FnSig) -> bool {

31
compiler/rustc_mir_build/src/build/matches/mod.rs
View file

@ -1347,23 +1347,22 @@ fn test_candidates_with_or(
let mut otherwise = None;
for match_pair in match_pairs {
if let PatKind::Or { ref pats } = *match_pair.pattern.kind {
let or_span = match_pair.pattern.span;
let place = match_pair.place;
first_candidate.visit_leaves(|leaf_candidate| {
self.test_or_pattern(
leaf_candidate,
&mut otherwise,
pats,
or_span,
place.clone(),
fake_borrows,
);
});
} else {
let PatKind::Or { ref pats } = &*match_pair.pattern.kind else {
bug!("Or-patterns should have been sorted to the end");
}
};
let or_span = match_pair.pattern.span;
let place = match_pair.place;
first_candidate.visit_leaves(|leaf_candidate| {
self.test_or_pattern(
leaf_candidate,
&mut otherwise,
pats,
or_span,
place.clone(),
fake_borrows,
);
});
}
let remainder_start = otherwise.unwrap_or_else(|| self.cfg.start_new_block());

7
compiler/rustc_mir_build/src/build/matches/test.rs
View file

@ -88,11 +88,8 @@ pub(super) fn add_cases_to_switch<'pat>(
switch_ty: Ty<'tcx>,
options: &mut FxIndexMap<&'tcx ty::Const<'tcx>, u128>,
) -> bool {
let match_pair = match candidate.match_pairs.iter().find(|mp| mp.place == *test_place) {
Some(match_pair) => match_pair,
_ => {
return false;
}
let Some(match_pair) = candidate.match_pairs.iter().find(|mp| mp.place == *test_place) else {
return false;
};
match *match_pair.pattern.kind {

4
compiler/rustc_resolve/src/late/diagnostics.rs
View file

@ -1171,9 +1171,7 @@ fn smart_resolve_context_dependent_help(
ident: Symbol,
kind: &AssocItemKind,
) -> Option<Symbol> {
let module = if let Some((module, _)) = self.current_trait_ref {
module
} else {
let Some((module, _)) = &self.current_trait_ref else {
return None;
};
if ident == kw::Underscore {

73
compiler/rustc_resolve/src/late/lifetimes.rs
View file

@ -1000,46 +1000,45 @@ 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 {
if let hir::GenericArg::Lifetime(lifetime) = lifetime {
self.visit_lifetime(lifetime);
let hir::GenericArg::Lifetime(lifetime) = lifetime else {
continue
};
self.visit_lifetime(lifetime);
// Check for predicates like `impl for<'a> Trait<impl OtherTrait<'a>>`
// and ban them. Type variables instantiated inside binders aren't
// 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();
if let Some(Region::LateBound(_, _, def_id, _)) = def {
if let Some(def_id) = def_id.as_local() {
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().get_parent_node(hir_id);
// FIXME(cjgillot) Can this check be replaced by
// `let parent_is_item = parent_id.is_owner();`?
let parent_is_item =
if let Some(parent_def_id) = parent_id.as_owner() {
matches!(
self.tcx.hir().krate().owners.get(parent_def_id),
Some(Some(_)),
)
} else {
false
};
// Check for predicates like `impl for<'a> Trait<impl OtherTrait<'a>>`
// and ban them. Type variables instantiated inside binders aren't
// 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(Region::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().get_parent_node(hir_id);
// FIXME(cjgillot) Can this check be replaced by
// `let parent_is_item = parent_id.is_owner();`?
let parent_is_item = if let Some(parent_def_id) = parent_id.as_owner() {
matches!(self.tcx.hir().krate().owners.get(parent_def_id), Some(Some(_)),)
} else {
false
};
if !parent_is_item {
if !self.trait_definition_only {
struct_span_err!(
self.tcx.sess,
lifetime.span,
E0657,
"`impl Trait` can only capture lifetimes \
bound at the fn or impl level"
)
.emit();
}
self.uninsert_lifetime_on_error(lifetime, def.unwrap());
}
}
if !parent_is_item {
if !self.trait_definition_only {
struct_span_err!(
self.tcx.sess,
lifetime.span,
E0657,
"`impl Trait` can only capture lifetimes \
bound at the fn or impl level"
)
.emit();
}
self.uninsert_lifetime_on_error(lifetime, def.unwrap());
}
}

61
compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
View file

@ -840,39 +840,38 @@ fn suggest_remove_reference(
};
for refs_remaining in 0..refs_number {
if let ty::Ref(_, inner_ty, _) = suggested_ty.kind() {
suggested_ty = inner_ty;
let ty::Ref(_, inner_ty, _) = suggested_ty.kind() else {
break;
};
suggested_ty = inner_ty;
let new_obligation = self.mk_trait_obligation_with_new_self_ty(
obligation.param_env,
trait_ref,
suggested_ty,
let new_obligation = self.mk_trait_obligation_with_new_self_ty(
obligation.param_env,
trait_ref,
suggested_ty,
);
if self.predicate_may_hold(&new_obligation) {
let sp = self
.tcx
.sess
.source_map()
.span_take_while(span, |c| c.is_whitespace() || *c == '&');
let remove_refs = refs_remaining + 1;
let msg = if remove_refs == 1 {
"consider removing the leading `&`-reference".to_string()
} else {
format!("consider removing {} leading `&`-references", remove_refs)
};
err.span_suggestion_short(
sp,
&msg,
String::new(),
Applicability::MachineApplicable,
);
if self.predicate_may_hold(&new_obligation) {
let sp = self
.tcx
.sess
.source_map()
.span_take_while(span, |c| c.is_whitespace() || *c == '&');
let remove_refs = refs_remaining + 1;
let msg = if remove_refs == 1 {
"consider removing the leading `&`-reference".to_string()
} else {
format!("consider removing {} leading `&`-references", remove_refs)
};
err.span_suggestion_short(
sp,
&msg,
String::new(),
Applicability::MachineApplicable,
);
break;
}
} else {
break;
}
}