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Mention when type parameter could be Clone

Browse source 
```
error[E0382]: use of moved value: `t`
  --> $DIR/use_of_moved_value_copy_suggestions.rs:7:9
   |
LL | fn duplicate_t<T>(t: T) -> (T, T) {
   |                   - move occurs because `t` has type `T`, which does not implement the `Copy` trait
...
LL |     (t, t)
   |      -  ^ value used here after move
   |      |
   |      value moved here
   |
help: if `T` implemented `Clone`, you could clone the value
  --> $DIR/use_of_moved_value_copy_suggestions.rs:4:16
   |
LL | fn duplicate_t<T>(t: T) -> (T, T) {
   |                ^ consider constraining this type parameter with `Clone`
...
LL |     (t, t)
   |      - you could clone this value
help: consider restricting type parameter `T`
   |
LL | fn duplicate_t<T: Copy>(t: T) -> (T, T) {
   |                 ++++++
```

The `help` is new. On ADTs, we also extend the output with span labels:

```
error[E0507]: cannot move out of static item `FOO`
  --> $DIR/issue-17718-static-move.rs:6:14
   |
LL |     let _a = FOO;
   |              ^^^ move occurs because `FOO` has type `Foo`, which does not implement the `Copy` trait
   |
note: if `Foo` implemented `Clone`, you could clone the value
  --> $DIR/issue-17718-static-move.rs:1:1
   |
LL | struct Foo;
   | ^^^^^^^^^^ consider implementing `Clone` for this type
...
LL |     let _a = FOO;
   |              --- you could clone this value
help: consider borrowing here
   |
LL |     let _a = &FOO;
   |              +
```
This commit is contained in:
Esteban Küber 2024-04-18 22:18:19 +00:00
parent 4aba2c55e6
commit d68f2a6b71
51 changed files with 640 additions and 86 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

47
compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs
View file

@ -347,7 +347,7 @@ fn suggest_ref_or_clone(
mpi: MovePathIndex,
err: &mut Diag<'tcx>,
in_pattern: &mut bool,
move_spans: UseSpans<'_>,
move_spans: UseSpans<'tcx>,
) {
let move_span = match move_spans {
UseSpans::ClosureUse { capture_kind_span, .. } => capture_kind_span,
@ -491,11 +491,11 @@ fn visit_pat(&mut self, p: &'hir hir::Pat<'hir>) {
..
} = move_spans
{
self.suggest_cloning(err, ty, expr, None);
self.suggest_cloning(err, ty, expr, None, Some(move_spans));
} else if self.suggest_hoisting_call_outside_loop(err, expr) {
// The place where the the type moves would be misleading to suggest clone.
// #121466
self.suggest_cloning(err, ty, expr, None);
self.suggest_cloning(err, ty, expr, None, Some(move_spans));
}
}
if let Some(pat) = finder.pat {
@ -1085,6 +1085,7 @@ pub(crate) fn suggest_cloning(
ty: Ty<'tcx>,
mut expr: &'cx hir::Expr<'cx>,
mut other_expr: Option<&'cx hir::Expr<'cx>>,
use_spans: Option<UseSpans<'tcx>>,
) {
if let hir::ExprKind::Struct(_, _, Some(_)) = expr.kind {
// We have `S { foo: val, ..base }`. In `check_aggregate_rvalue` we have a single
@ -1197,8 +1198,44 @@ pub(crate) fn suggest_cloning(
.all(|field| self.implements_clone(field.ty(self.infcx.tcx, args)))
})
{
let ty_span = self.infcx.tcx.def_span(def.did());
let mut span: MultiSpan = ty_span.into();
span.push_span_label(ty_span, "consider implementing `Clone` for this type");
span.push_span_label(expr.span, "you could clone this value");
err.span_note(
self.infcx.tcx.def_span(def.did()),
span,
format!("if `{ty}` implemented `Clone`, you could clone the value"),
);
} else if let ty::Param(param) = ty.kind()
&& let Some(_clone_trait_def) = self.infcx.tcx.lang_items().clone_trait()
&& let generics = self.infcx.tcx.generics_of(self.mir_def_id())
&& let generic_param = generics.type_param(*param, self.infcx.tcx)
&& let param_span = self.infcx.tcx.def_span(generic_param.def_id)
&& if let Some(UseSpans::FnSelfUse { kind, .. }) = use_spans
&& let CallKind::FnCall { fn_trait_id, self_ty } = kind
&& let ty::Param(_) = self_ty.kind()
&& ty == self_ty
&& [
self.infcx.tcx.lang_items().fn_once_trait(),
self.infcx.tcx.lang_items().fn_mut_trait(),
self.infcx.tcx.lang_items().fn_trait(),
]
.contains(&Some(fn_trait_id))
{
// Do not suggest `F: FnOnce() + Clone`.
false
} else {
true
}
{
let mut span: MultiSpan = param_span.into();
span.push_span_label(
param_span,
"consider constraining this type parameter with `Clone`",
);
span.push_span_label(expr.span, "you could clone this value");
err.span_help(
span,
format!("if `{ty}` implemented `Clone`, you could clone the value"),
);
}
@ -1403,7 +1440,7 @@ pub(crate) fn report_move_out_while_borrowed(
if let Some(expr) = self.find_expr(borrow_span)
&& let Some(ty) = typeck_results.node_type_opt(expr.hir_id)
{
self.suggest_cloning(&mut err, ty, expr, self.find_expr(span));
self.suggest_cloning(&mut err, ty, expr, self.find_expr(span), Some(move_spans));
}
self.buffer_error(err);
}

12
compiler/rustc_borrowck/src/diagnostics/move_errors.rs
View file

@ -447,7 +447,7 @@ fn add_move_hints(&self, error: GroupedMoveError<'tcx>, err: &mut Diag<'_>, span
};
if let Some(expr) = self.find_expr(span) {
self.suggest_cloning(err, place_ty, expr, self.find_expr(other_span));
self.suggest_cloning(err, place_ty, expr, self.find_expr(other_span), None);
}
err.subdiagnostic(
@ -482,7 +482,13 @@ fn add_move_hints(&self, error: GroupedMoveError<'tcx>, err: &mut Diag<'_>, span
};
if let Some(expr) = self.find_expr(use_span) {
self.suggest_cloning(err, place_ty, expr, self.find_expr(span));
self.suggest_cloning(
err,
place_ty,
expr,
self.find_expr(span),
Some(use_spans),
);
}
err.subdiagnostic(
@ -595,7 +601,7 @@ fn add_move_error_details(&self, err: &mut Diag<'_>, binds_to: &[Local]) {
let place_desc = &format!("`{}`", self.local_names[*local].unwrap());
if let Some(expr) = self.find_expr(binding_span) {
self.suggest_cloning(err, bind_to.ty, expr, None);
self.suggest_cloning(err, bind_to.ty, expr, None, None);
}
err.subdiagnostic(

5
tests/ui/associated-types/issue-25700.stderr
View file

@ -12,7 +12,10 @@ note: if `S<()>` implemented `Clone`, you could clone the value
--> $DIR/issue-25700.rs:1:1
|
LL | struct S<T: 'static>(#[allow(dead_code)] Option<&'static T>);
| ^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | drop(t);
| - you could clone this value
error: aborting due to 1 previous error

7
tests/ui/auto-traits/typeck-auto-trait-no-supertraits-2.stderr
View file

@ -23,6 +23,13 @@ LL | fn copy<T: Magic>(x: T) -> (T, T) { (x, x) }
| | value moved here
| move occurs because `x` has type `T`, which does not implement the `Copy` trait
|
help: if `T` implemented `Clone`, you could clone the value
--> $DIR/typeck-auto-trait-no-supertraits-2.rs:8:9
|
LL | fn copy<T: Magic>(x: T) -> (T, T) { (x, x) }
| ^ - you could clone this value
| |
| consider constraining this type parameter with `Clone`
help: consider further restricting this bound
|
LL | fn copy<T: Magic + Copy>(x: T) -> (T, T) { (x, x) }

140
tests/ui/binop/binop-consume-args.stderr
View file

@ -8,6 +8,13 @@ LL | lhs + rhs;
LL | drop(lhs);
| ^^^ value used here after move
|
help: if `A` implemented `Clone`, you could clone the value
--> $DIR/binop-consume-args.rs:5:8
|
LL | fn add<A: Add<B, Output=()>, B>(lhs: A, rhs: B) {
| ^ consider constraining this type parameter with `Clone`
LL | lhs + rhs;
| --- you could clone this value
note: calling this operator moves the left-hand side
--> $SRC_DIR/core/src/ops/arith.rs:LL:COL
help: consider further restricting this bound
@ -26,6 +33,13 @@ LL | drop(lhs);
LL | drop(rhs);
| ^^^ value used here after move
|
help: if `B` implemented `Clone`, you could clone the value
--> $DIR/binop-consume-args.rs:5:30
|
LL | fn add<A: Add<B, Output=()>, B>(lhs: A, rhs: B) {
| ^ consider constraining this type parameter with `Clone`
LL | lhs + rhs;
| --- you could clone this value
help: consider restricting type parameter `B`
|
LL | fn add<A: Add<B, Output=()>, B: Copy>(lhs: A, rhs: B) {
@ -41,6 +55,13 @@ LL | lhs - rhs;
LL | drop(lhs);
| ^^^ value used here after move
|
help: if `A` implemented `Clone`, you could clone the value
--> $DIR/binop-consume-args.rs:11:8
|
LL | fn sub<A: Sub<B, Output=()>, B>(lhs: A, rhs: B) {
| ^ consider constraining this type parameter with `Clone`
LL | lhs - rhs;
| --- you could clone this value
note: calling this operator moves the left-hand side
--> $SRC_DIR/core/src/ops/arith.rs:LL:COL
help: consider further restricting this bound
@ -59,6 +80,13 @@ LL | drop(lhs);
LL | drop(rhs);
| ^^^ value used here after move
|
help: if `B` implemented `Clone`, you could clone the value
--> $DIR/binop-consume-args.rs:11:30
|
LL | fn sub<A: Sub<B, Output=()>, B>(lhs: A, rhs: B) {
| ^ consider constraining this type parameter with `Clone`
LL | lhs - rhs;
| --- you could clone this value
help: consider restricting type parameter `B`
|
LL | fn sub<A: Sub<B, Output=()>, B: Copy>(lhs: A, rhs: B) {
@ -74,6 +102,13 @@ LL | lhs * rhs;
LL | drop(lhs);
| ^^^ value used here after move
|
help: if `A` implemented `Clone`, you could clone the value
--> $DIR/binop-consume-args.rs:17:8
|
LL | fn mul<A: Mul<B, Output=()>, B>(lhs: A, rhs: B) {
| ^ consider constraining this type parameter with `Clone`
LL | lhs * rhs;
| --- you could clone this value
note: calling this operator moves the left-hand side
--> $SRC_DIR/core/src/ops/arith.rs:LL:COL
help: consider further restricting this bound
@ -92,6 +127,13 @@ LL | drop(lhs);
LL | drop(rhs);
| ^^^ value used here after move
|
help: if `B` implemented `Clone`, you could clone the value
--> $DIR/binop-consume-args.rs:17:30
|
LL | fn mul<A: Mul<B, Output=()>, B>(lhs: A, rhs: B) {
| ^ consider constraining this type parameter with `Clone`
LL | lhs * rhs;
| --- you could clone this value
help: consider restricting type parameter `B`
|
LL | fn mul<A: Mul<B, Output=()>, B: Copy>(lhs: A, rhs: B) {
@ -107,6 +149,13 @@ LL | lhs / rhs;
LL | drop(lhs);
| ^^^ value used here after move
|
help: if `A` implemented `Clone`, you could clone the value
--> $DIR/binop-consume-args.rs:23:8
|
LL | fn div<A: Div<B, Output=()>, B>(lhs: A, rhs: B) {
| ^ consider constraining this type parameter with `Clone`
LL | lhs / rhs;
| --- you could clone this value
note: calling this operator moves the left-hand side
--> $SRC_DIR/core/src/ops/arith.rs:LL:COL
help: consider further restricting this bound
@ -125,6 +174,13 @@ LL | drop(lhs);
LL | drop(rhs);
| ^^^ value used here after move
|
help: if `B` implemented `Clone`, you could clone the value
--> $DIR/binop-consume-args.rs:23:30
|
LL | fn div<A: Div<B, Output=()>, B>(lhs: A, rhs: B) {
| ^ consider constraining this type parameter with `Clone`
LL | lhs / rhs;
| --- you could clone this value
help: consider restricting type parameter `B`
|
LL | fn div<A: Div<B, Output=()>, B: Copy>(lhs: A, rhs: B) {
@ -140,6 +196,13 @@ LL | lhs % rhs;
LL | drop(lhs);
| ^^^ value used here after move
|
help: if `A` implemented `Clone`, you could clone the value
--> $DIR/binop-consume-args.rs:29:8
|
LL | fn rem<A: Rem<B, Output=()>, B>(lhs: A, rhs: B) {
| ^ consider constraining this type parameter with `Clone`
LL | lhs % rhs;
| --- you could clone this value
note: calling this operator moves the left-hand side
--> $SRC_DIR/core/src/ops/arith.rs:LL:COL
help: consider further restricting this bound
@ -158,6 +221,13 @@ LL | drop(lhs);
LL | drop(rhs);
| ^^^ value used here after move
|
help: if `B` implemented `Clone`, you could clone the value
--> $DIR/binop-consume-args.rs:29:30
|
LL | fn rem<A: Rem<B, Output=()>, B>(lhs: A, rhs: B) {
| ^ consider constraining this type parameter with `Clone`
LL | lhs % rhs;
| --- you could clone this value
help: consider restricting type parameter `B`
|
LL | fn rem<A: Rem<B, Output=()>, B: Copy>(lhs: A, rhs: B) {
@ -173,6 +243,13 @@ LL | lhs & rhs;
LL | drop(lhs);
| ^^^ value used here after move
|
help: if `A` implemented `Clone`, you could clone the value
--> $DIR/binop-consume-args.rs:35:11
|
LL | fn bitand<A: BitAnd<B, Output=()>, B>(lhs: A, rhs: B) {
| ^ consider constraining this type parameter with `Clone`
LL | lhs & rhs;
| --- you could clone this value
note: calling this operator moves the left-hand side
--> $SRC_DIR/core/src/ops/bit.rs:LL:COL
help: consider further restricting this bound
@ -191,6 +268,13 @@ LL | drop(lhs);
LL | drop(rhs);
| ^^^ value used here after move
|
help: if `B` implemented `Clone`, you could clone the value
--> $DIR/binop-consume-args.rs:35:36
|
LL | fn bitand<A: BitAnd<B, Output=()>, B>(lhs: A, rhs: B) {
| ^ consider constraining this type parameter with `Clone`
LL | lhs & rhs;
| --- you could clone this value
help: consider restricting type parameter `B`
|
LL | fn bitand<A: BitAnd<B, Output=()>, B: Copy>(lhs: A, rhs: B) {
@ -206,6 +290,13 @@ LL | lhs | rhs;
LL | drop(lhs);
| ^^^ value used here after move
|
help: if `A` implemented `Clone`, you could clone the value
--> $DIR/binop-consume-args.rs:41:10
|
LL | fn bitor<A: BitOr<B, Output=()>, B>(lhs: A, rhs: B) {
| ^ consider constraining this type parameter with `Clone`
LL | lhs | rhs;
| --- you could clone this value
note: calling this operator moves the left-hand side
--> $SRC_DIR/core/src/ops/bit.rs:LL:COL
help: consider further restricting this bound
@ -224,6 +315,13 @@ LL | drop(lhs);
LL | drop(rhs);
| ^^^ value used here after move
|
help: if `B` implemented `Clone`, you could clone the value
--> $DIR/binop-consume-args.rs:41:34
|
LL | fn bitor<A: BitOr<B, Output=()>, B>(lhs: A, rhs: B) {
| ^ consider constraining this type parameter with `Clone`
LL | lhs | rhs;
| --- you could clone this value
help: consider restricting type parameter `B`
|
LL | fn bitor<A: BitOr<B, Output=()>, B: Copy>(lhs: A, rhs: B) {
@ -239,6 +337,13 @@ LL | lhs ^ rhs;
LL | drop(lhs);
| ^^^ value used here after move
|
help: if `A` implemented `Clone`, you could clone the value
--> $DIR/binop-consume-args.rs:47:11
|
LL | fn bitxor<A: BitXor<B, Output=()>, B>(lhs: A, rhs: B) {
| ^ consider constraining this type parameter with `Clone`
LL | lhs ^ rhs;
| --- you could clone this value
note: calling this operator moves the left-hand side
--> $SRC_DIR/core/src/ops/bit.rs:LL:COL
help: consider further restricting this bound
@ -257,6 +362,13 @@ LL | drop(lhs);
LL | drop(rhs);
| ^^^ value used here after move
|
help: if `B` implemented `Clone`, you could clone the value
--> $DIR/binop-consume-args.rs:47:36
|
LL | fn bitxor<A: BitXor<B, Output=()>, B>(lhs: A, rhs: B) {
| ^ consider constraining this type parameter with `Clone`
LL | lhs ^ rhs;
| --- you could clone this value
help: consider restricting type parameter `B`
|
LL | fn bitxor<A: BitXor<B, Output=()>, B: Copy>(lhs: A, rhs: B) {
@ -272,6 +384,13 @@ LL | lhs << rhs;
LL | drop(lhs);
| ^^^ value used here after move
|
help: if `A` implemented `Clone`, you could clone the value
--> $DIR/binop-consume-args.rs:53:8
|
LL | fn shl<A: Shl<B, Output=()>, B>(lhs: A, rhs: B) {
| ^ consider constraining this type parameter with `Clone`
LL | lhs << rhs;
| --- you could clone this value
note: calling this operator moves the left-hand side
--> $SRC_DIR/core/src/ops/bit.rs:LL:COL
help: consider further restricting this bound
@ -290,6 +409,13 @@ LL | drop(lhs);
LL | drop(rhs);
| ^^^ value used here after move
|
help: if `B` implemented `Clone`, you could clone the value
--> $DIR/binop-consume-args.rs:53:30
|
LL | fn shl<A: Shl<B, Output=()>, B>(lhs: A, rhs: B) {
| ^ consider constraining this type parameter with `Clone`
LL | lhs << rhs;
| --- you could clone this value
help: consider restricting type parameter `B`
|
LL | fn shl<A: Shl<B, Output=()>, B: Copy>(lhs: A, rhs: B) {
@ -305,6 +431,13 @@ LL | lhs >> rhs;
LL | drop(lhs);
| ^^^ value used here after move
|
help: if `A` implemented `Clone`, you could clone the value
--> $DIR/binop-consume-args.rs:59:8
|
LL | fn shr<A: Shr<B, Output=()>, B>(lhs: A, rhs: B) {
| ^ consider constraining this type parameter with `Clone`
LL | lhs >> rhs;
| --- you could clone this value
note: calling this operator moves the left-hand side
--> $SRC_DIR/core/src/ops/bit.rs:LL:COL
help: consider further restricting this bound
@ -323,6 +456,13 @@ LL | drop(lhs);
LL | drop(rhs);
| ^^^ value used here after move
|
help: if `B` implemented `Clone`, you could clone the value
--> $DIR/binop-consume-args.rs:59:30
|
LL | fn shr<A: Shr<B, Output=()>, B>(lhs: A, rhs: B) {
| ^ consider constraining this type parameter with `Clone`
LL | lhs >> rhs;
| --- you could clone this value
help: consider restricting type parameter `B`
|
LL | fn shr<A: Shr<B, Output=()>, B: Copy>(lhs: A, rhs: B) {

41
tests/ui/binop/binop-move-semantics.stderr
View file

@ -11,6 +11,13 @@ LL | | x;
| |_____value used here after move
| `x` moved due to usage in operator
|
help: if `T` implemented `Clone`, you could clone the value
--> $DIR/binop-move-semantics.rs:5:16
|
LL | fn double_move<T: Add<Output=()>>(x: T) {
| ^ consider constraining this type parameter with `Clone`
LL | x
| - you could clone this value
note: calling this operator moves the left-hand side
--> $SRC_DIR/core/src/ops/arith.rs:LL:COL
help: consider further restricting this bound
@ -51,6 +58,14 @@ LL | x
...
LL | use_mut(n); use_imm(m);
| - borrow later used here
|
help: if `T` implemented `Clone`, you could clone the value
--> $DIR/binop-move-semantics.rs:17:18
|
LL | fn move_borrowed<T: Add<Output=()>>(x: T, mut y: T) {
| ^ consider constraining this type parameter with `Clone`
LL | let m = &x;
| -- you could clone this value
error[E0505]: cannot move out of `y` because it is borrowed
--> $DIR/binop-move-semantics.rs:23:5
@ -65,6 +80,15 @@ LL | y;
| ^ move out of `y` occurs here
LL | use_mut(n); use_imm(m);
| - borrow later used here
|
help: if `T` implemented `Clone`, you could clone the value
--> $DIR/binop-move-semantics.rs:17:18
|
LL | fn move_borrowed<T: Add<Output=()>>(x: T, mut y: T) {
| ^ consider constraining this type parameter with `Clone`
LL | let m = &x;
LL | let n = &mut y;
| ------ you could clone this value
error[E0507]: cannot move out of `*m` which is behind a mutable reference
--> $DIR/binop-move-semantics.rs:30:5
@ -80,12 +104,29 @@ LL | | *n;
|
note: calling this operator moves the left-hand side
--> $SRC_DIR/core/src/ops/arith.rs:LL:COL
help: if `T` implemented `Clone`, you could clone the value
--> $DIR/binop-move-semantics.rs:26:24
|
LL | fn illegal_dereference<T: Add<Output=()>>(mut x: T, y: T) {
| ^ consider constraining this type parameter with `Clone`
...
LL | *m
| -- you could clone this value
error[E0507]: cannot move out of `*n` which is behind a shared reference
--> $DIR/binop-move-semantics.rs:32:5
|
LL | *n;
| ^^ move occurs because `*n` has type `T`, which does not implement the `Copy` trait
|
help: if `T` implemented `Clone`, you could clone the value
--> $DIR/binop-move-semantics.rs:26:24
|
LL | fn illegal_dereference<T: Add<Output=()>>(mut x: T, y: T) {
| ^ consider constraining this type parameter with `Clone`
...
LL | *n;
| -- you could clone this value
error[E0502]: cannot borrow `f` as immutable because it is also borrowed as mutable
--> $DIR/binop-move-semantics.rs:54:5

5
tests/ui/borrowck/borrowck-move-out-of-static-item.stderr
View file

@ -8,7 +8,10 @@ note: if `Foo` implemented `Clone`, you could clone the value
--> $DIR/borrowck-move-out-of-static-item.rs:3:1
|
LL | struct Foo {
| ^^^^^^^^^^
| ^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | test(BAR);
| --- you could clone this value
error: aborting due to 1 previous error

5
tests/ui/borrowck/borrowck-move-subcomponent.stderr
View file

@ -14,7 +14,10 @@ note: if `S` implemented `Clone`, you could clone the value
--> $DIR/borrowck-move-subcomponent.rs:6:1
|
LL | struct S {
| ^^^^^^^^
| ^^^^^^^^ consider implementing `Clone` for this type
...
LL | let pb = &a;
| -- you could clone this value
error: aborting due to 1 previous error

5
tests/ui/borrowck/borrowck-overloaded-call.stderr
View file

@ -34,7 +34,10 @@ note: if `SFnOnce` implemented `Clone`, you could clone the value
--> $DIR/borrowck-overloaded-call.rs:41:1
|
LL | struct SFnOnce {
| ^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | s(" world".to_string());
| - you could clone this value
error: aborting due to 3 previous errors

12
tests/ui/borrowck/clone-on-ref.stderr
View file

@ -32,6 +32,13 @@ LL |
LL | println!("{b}");
| --- borrow later used here
|
help: if `T` implemented `Clone`, you could clone the value
--> $DIR/clone-on-ref.rs:11:8
|
LL | fn bar<T: std::fmt::Display>(x: T) {
| ^ consider constraining this type parameter with `Clone`
LL | let a = &x;
| -- you could clone this value
help: consider further restricting this bound
|
LL | fn bar<T: std::fmt::Display + Clone>(x: T) {
@ -56,7 +63,10 @@ note: if `A` implemented `Clone`, you could clone the value
--> $DIR/clone-on-ref.rs:19:1
|
LL | struct A;
| ^^^^^^^^
| ^^^^^^^^ consider implementing `Clone` for this type
LL | fn qux(x: A) {
LL | let a = &x;
| -- you could clone this value
help: consider annotating `A` with `#[derive(Clone)]`
|
LL + #[derive(Clone)]

5
tests/ui/borrowck/issue-101119.stderr
View file

@ -22,7 +22,10 @@ note: if `State` implemented `Clone`, you could clone the value
--> $DIR/issue-101119.rs:1:1
|
LL | struct State;
| ^^^^^^^^^^^^
| ^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | fill_segment(state);
| ----- you could clone this value
error: aborting due to 1 previous error

5
tests/ui/borrowck/issue-103624.stderr
View file

@ -13,8 +13,11 @@ LL | self.b;
note: if `StructB` implemented `Clone`, you could clone the value
--> $DIR/issue-103624.rs:23:1
|
LL | self.b;
| ------ you could clone this value
...
LL | struct StructB {}
| ^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^ consider implementing `Clone` for this type
error[E0521]: borrowed data escapes outside of method
--> $DIR/issue-103624.rs:14:9

5
tests/ui/borrowck/issue-119915-bad-clone-suggestion.stderr
View file

@ -15,7 +15,10 @@ note: if `Example<E, NoLifetime>` implemented `Clone`, you could clone the value
--> $DIR/issue-119915-bad-clone-suggestion.rs:3:1
|
LL | struct Example<E, FakeParam>(PhantomData<(fn(E), fn(FakeParam))>);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | unsafe { self.change() }
| ---- you could clone this value
error: aborting due to 1 previous error

5
tests/ui/borrowck/issue-17718-static-move.stderr
View file

@ -8,7 +8,10 @@ note: if `Foo` implemented `Clone`, you could clone the value
--> $DIR/issue-17718-static-move.rs:1:1
|
LL | struct Foo;
| ^^^^^^^^^^
| ^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | let _a = FOO;
| --- you could clone this value
help: consider borrowing here
|
LL | let _a = &FOO;

20
tests/ui/borrowck/issue-20801.stderr
View file

@ -23,7 +23,10 @@ note: if `T` implemented `Clone`, you could clone the value
--> $DIR/issue-20801.rs:3:1
|
LL | struct T(u8);
| ^^^^^^^^
| ^^^^^^^^ consider implementing `Clone` for this type
...
LL | let a = unsafe { *mut_ref() };
| ---------- you could clone this value
help: consider removing the dereference here
|
LL - let a = unsafe { *mut_ref() };
@ -40,7 +43,10 @@ note: if `T` implemented `Clone`, you could clone the value
--> $DIR/issue-20801.rs:3:1
|
LL | struct T(u8);
| ^^^^^^^^
| ^^^^^^^^ consider implementing `Clone` for this type
...
LL | let b = unsafe { *imm_ref() };
| ---------- you could clone this value
help: consider removing the dereference here
|
LL - let b = unsafe { *imm_ref() };
@ -57,7 +63,10 @@ note: if `T` implemented `Clone`, you could clone the value
--> $DIR/issue-20801.rs:3:1
|
LL | struct T(u8);
| ^^^^^^^^
| ^^^^^^^^ consider implementing `Clone` for this type
...
LL | let c = unsafe { *mut_ptr() };
| ---------- you could clone this value
help: consider removing the dereference here
|
LL - let c = unsafe { *mut_ptr() };
@ -74,7 +83,10 @@ note: if `T` implemented `Clone`, you could clone the value
--> $DIR/issue-20801.rs:3:1
|
LL | struct T(u8);
| ^^^^^^^^
| ^^^^^^^^ consider implementing `Clone` for this type
...
LL | let d = unsafe { *const_ptr() };
| ------------ you could clone this value
help: consider removing the dereference here
|
LL - let d = unsafe { *const_ptr() };

5
tests/ui/borrowck/move-error-in-promoted-2.stderr
View file

@ -11,7 +11,10 @@ note: if `S` implemented `Clone`, you could clone the value
--> $DIR/move-error-in-promoted-2.rs:3:1
|
LL | struct S;
| ^^^^^^^^
| ^^^^^^^^ consider implementing `Clone` for this type
...
LL | &([S][0],);
| ------ you could clone this value
error: aborting due to 1 previous error

7
tests/ui/borrowck/move-error-snippets.stderr
View file

@ -13,7 +13,12 @@ note: if `A` implemented `Clone`, you could clone the value
--> $DIR/move-error-snippets.rs:9:1
|
LL | struct A;
| ^^^^^^^^
| ^^^^^^^^ consider implementing `Clone` for this type
|
::: $DIR/move-error-snippets-ext.rs:5:17
|
LL | let a = $c;
| -- you could clone this value
= note: this error originates in the macro `aaa` which comes from the expansion of the macro `sss` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider borrowing here
|

10
tests/ui/borrowck/move-in-static-initializer-issue-38520.stderr
View file

@ -8,7 +8,10 @@ note: if `Foo` implemented `Clone`, you could clone the value
--> $DIR/move-in-static-initializer-issue-38520.rs:5:1
|
LL | struct Foo(usize);
| ^^^^^^^^^^
| ^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | static Y: usize = get(*&X);
| --- you could clone this value
error[E0507]: cannot move out of a shared reference
--> $DIR/move-in-static-initializer-issue-38520.rs:13:22
@ -20,7 +23,10 @@ note: if `Foo` implemented `Clone`, you could clone the value
--> $DIR/move-in-static-initializer-issue-38520.rs:5:1
|
LL | struct Foo(usize);
| ^^^^^^^^^^
| ^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | const Z: usize = get(*&X);
| --- you could clone this value
error: aborting due to 2 previous errors

5
tests/ui/box/leak-alloc.stderr
View file

@ -16,7 +16,10 @@ note: if `Alloc` implemented `Clone`, you could clone the value
--> $DIR/leak-alloc.rs:8:1
|
LL | struct Alloc {}
| ^^^^^^^^^^^^
| ^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | let boxed = Box::new_in(10, alloc.by_ref());
| ----- you could clone this value
error: aborting due to 1 previous error

5
tests/ui/derives/deriving-with-repr-packed.stderr
View file

@ -40,7 +40,10 @@ note: if `Y` implemented `Clone`, you could clone the value
--> $DIR/deriving-with-repr-packed.rs:16:1
|
LL | struct Y(usize);
| ^^^^^^^^
| ^^^^^^^^ consider implementing `Clone` for this type
...
LL | struct X(Y);
| - you could clone this value
= note: `#[derive(Debug)]` triggers a move because taking references to the fields of a packed struct is undefined behaviour
= note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

5
tests/ui/error-codes/E0504.stderr
View file

@ -18,7 +18,10 @@ note: if `FancyNum` implemented `Clone`, you could clone the value
--> $DIR/E0504.rs:1:1
|
LL | struct FancyNum {
| ^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | let fancy_ref = &fancy_num;
| ---------- you could clone this value
error: aborting due to 1 previous error

5
tests/ui/error-codes/E0505.stderr
View file

@ -15,7 +15,10 @@ note: if `Value` implemented `Clone`, you could clone the value
--> $DIR/E0505.rs:1:1
|
LL | struct Value {}
| ^^^^^^^^^^^^
| ^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | let _ref_to_val: &Value = &x;
| -- you could clone this value
error: aborting due to 1 previous error

5
tests/ui/error-codes/E0507.stderr
View file

@ -15,7 +15,10 @@ note: if `TheDarkKnight` implemented `Clone`, you could clone the value
--> $DIR/E0507.rs:3:1
|
LL | struct TheDarkKnight;
| ^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | x.borrow().nothing_is_true();
| ---------- you could clone this value
error: aborting due to 1 previous error

5
tests/ui/error-codes/E0508-fail.stderr
View file

@ -11,7 +11,10 @@ note: if `NonCopy` implemented `Clone`, you could clone the value
--> $DIR/E0508-fail.rs:1:1
|
LL | struct NonCopy;
| ^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | let _value = array[0];
| -------- you could clone this value
help: consider borrowing here
|
LL | let _value = &array[0];

5
tests/ui/error-codes/E0508.stderr
View file

@ -11,7 +11,10 @@ note: if `NonCopy` implemented `Clone`, you could clone the value
--> $DIR/E0508.rs:1:1
|
LL | struct NonCopy;
| ^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | let _value = array[0];
| -------- you could clone this value
help: consider borrowing here
|
LL | let _value = &array[0];

5
tests/ui/error-codes/E0509.stderr
View file

@ -11,7 +11,10 @@ note: if `FancyNum` implemented `Clone`, you could clone the value
--> $DIR/E0509.rs:1:1
|
LL | struct FancyNum {
| ^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | let fancy_field = drop_struct.fancy;
| ----------------- you could clone this value
help: consider borrowing here
|
LL | let fancy_field = &drop_struct.fancy;

10
tests/ui/issues/issue-17385.stderr
View file

@ -12,7 +12,10 @@ note: if `X` implemented `Clone`, you could clone the value
--> $DIR/issue-17385.rs:1:1
|
LL | struct X(isize);
| ^^^^^^^^
| ^^^^^^^^ consider implementing `Clone` for this type
...
LL | drop(foo);
| --- you could clone this value
error[E0382]: use of moved value: `e`
--> $DIR/issue-17385.rs:25:11
@ -28,7 +31,10 @@ note: if `Enum` implemented `Clone`, you could clone the value
--> $DIR/issue-17385.rs:3:1
|
LL | enum Enum {
| ^^^^^^^^^
| ^^^^^^^^^ consider implementing `Clone` for this type
...
LL | drop(e);
| - you could clone this value
error: aborting due to 2 previous errors

2
tests/ui/issues/issue-24357.rs
View file

@ -1,10 +1,12 @@
struct NoCopy; //~ NOTE if `NoCopy` implemented `Clone`, you could clone the value
//~^ NOTE consider implementing `Clone` for this type
fn main() {
let x = NoCopy;
//~^ NOTE move occurs because `x` has type `NoCopy`
let f = move || { let y = x; };
//~^ NOTE value moved into closure here
//~| NOTE variable moved due to use in closure
//~| NOTE you could clone this value
let z = x;
//~^ ERROR use of moved value: `x`
//~| NOTE value used here after move

7
tests/ui/issues/issue-24357.stderr
View file

@ -1,5 +1,5 @@
error[E0382]: use of moved value: `x`
--> $DIR/issue-24357.rs:8:12
--> $DIR/issue-24357.rs:10:12
|
LL | let x = NoCopy;
| - move occurs because `x` has type `NoCopy`, which does not implement the `Copy` trait
@ -16,7 +16,10 @@ note: if `NoCopy` implemented `Clone`, you could clone the value
--> $DIR/issue-24357.rs:1:1
|
LL | struct NoCopy;
| ^^^^^^^^^^^^^
| ^^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | let f = move || { let y = x; };
| - you could clone this value
error: aborting due to 1 previous error

8
tests/ui/issues/issue-4335.stderr
View file

@ -7,6 +7,14 @@ LL | id(Box::new(|| *v))
| -- ^^ move occurs because `*v` has type `T`, which does not implement the `Copy` trait
| |
| captured by this `FnMut` closure
|
help: if `T` implemented `Clone`, you could clone the value
--> $DIR/issue-4335.rs:5:10
|
LL | fn f<'r, T>(v: &'r T) -> Box<dyn FnMut() -> T + 'r> {
| ^ consider constraining this type parameter with `Clone`
LL | id(Box::new(|| *v))
| -- you could clone this value
error: aborting due to 1 previous error

5
tests/ui/mir/issue-102389.stderr
View file

@ -8,7 +8,10 @@ note: if `Enum` implemented `Clone`, you could clone the value
--> $DIR/issue-102389.rs:1:1
|
LL | enum Enum { A, B, C }
| ^^^^^^^^^
| ^^^^^^^^^ consider implementing `Clone` for this type
...
LL | array[*inbounds as usize]
| --------- you could clone this value
error: aborting due to 1 previous error

4
tests/ui/moves/borrow-closures-instead-of-move.rs
View file

@ -1,4 +1,4 @@
fn takes_fn(f: impl Fn()) {
fn takes_fn(f: impl Fn()) { //~ HELP if `impl Fn()` implemented `Clone`
loop {
takes_fnonce(f);
//~^ ERROR use of moved value
@ -6,7 +6,7 @@ fn takes_fn(f: impl Fn()) {
}
}
fn takes_fn_mut(m: impl FnMut()) {
fn takes_fn_mut(m: impl FnMut()) { //~ HELP if `impl FnMut()` implemented `Clone`
if maybe() {
takes_fnonce(m);
//~^ HELP consider mutably borrowing

16
tests/ui/moves/borrow-closures-instead-of-move.stderr
View file

@ -15,6 +15,14 @@ LL | fn takes_fnonce(_: impl FnOnce()) {}
| ------------ ^^^^^^^^^^^^^ this parameter takes ownership of the value
| |
| in this function
help: if `impl Fn()` implemented `Clone`, you could clone the value
--> $DIR/borrow-closures-instead-of-move.rs:1:16
|
LL | fn takes_fn(f: impl Fn()) {
| ^^^^^^^^^ consider constraining this type parameter with `Clone`
LL | loop {
LL | takes_fnonce(f);
| - you could clone this value
help: consider borrowing `f`
|
LL | takes_fnonce(&f);
@ -39,6 +47,14 @@ LL | fn takes_fnonce(_: impl FnOnce()) {}
| ------------ ^^^^^^^^^^^^^ this parameter takes ownership of the value
| |
| in this function
help: if `impl FnMut()` implemented `Clone`, you could clone the value
--> $DIR/borrow-closures-instead-of-move.rs:9:20
|
LL | fn takes_fn_mut(m: impl FnMut()) {
| ^^^^^^^^^^^^ consider constraining this type parameter with `Clone`
LL | if maybe() {
LL | takes_fnonce(m);
| - you could clone this value
help: consider mutably borrowing `m`
|
LL | takes_fnonce(&mut m);

8
tests/ui/moves/issue-72649-uninit-in-loop.rs
View file

@ -7,6 +7,10 @@
//~| NOTE if `NonCopy` implemented `Clone`
//~| NOTE if `NonCopy` implemented `Clone`
//~| NOTE if `NonCopy` implemented `Clone`
//~| NOTE consider implementing `Clone` for this type
//~| NOTE consider implementing `Clone` for this type
//~| NOTE consider implementing `Clone` for this type
//~| NOTE consider implementing `Clone` for this type
fn good() {
loop {
@ -21,6 +25,7 @@ fn moved_here_1() {
//~^ NOTE move occurs because `value` has type `NonCopy`, which does not implement the `Copy` trait
let _used = value;
//~^ NOTE value moved here
//~| NOTE you could clone this value
let _used2 = value; //~ ERROR use of moved value: `value`
//~^ NOTE value used here after move
}
@ -32,6 +37,7 @@ fn moved_here_2() {
loop { //~ NOTE inside of this loop
let _used = value;
//~^ NOTE value moved here
//~| NOTE you could clone this value
loop {
let _used2 = value; //~ ERROR use of moved value: `value`
//~^ NOTE value used here after move
@ -45,6 +51,7 @@ fn moved_loop_1() {
loop { //~ NOTE inside of this loop
let _used = value; //~ ERROR use of moved value: `value`
//~^ NOTE value moved here, in previous iteration of loop
//~| NOTE you could clone this value
}
}
@ -56,6 +63,7 @@ fn moved_loop_2() {
loop { //~ NOTE inside of this loop
let _used2 = value; //~ ERROR use of moved value: `value`
//~^ NOTE value moved here, in previous iteration of loop
//~| NOTE you could clone this value
}
}

34
tests/ui/moves/issue-72649-uninit-in-loop.stderr
View file

@ -1,12 +1,12 @@
error[E0382]: use of moved value: `value`
--> $DIR/issue-72649-uninit-in-loop.rs:24:22
--> $DIR/issue-72649-uninit-in-loop.rs:29:22
|
LL | let value = NonCopy{};
| ----- move occurs because `value` has type `NonCopy`, which does not implement the `Copy` trait
LL |
LL | let _used = value;
| ----- value moved here
LL |
...
LL | let _used2 = value;
| ^^^^^ value used here after move
|
@ -14,10 +14,13 @@ note: if `NonCopy` implemented `Clone`, you could clone the value
--> $DIR/issue-72649-uninit-in-loop.rs:5:1
|
LL | struct NonCopy;
| ^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | let _used = value;
| ----- you could clone this value
error[E0382]: use of moved value: `value`
--> $DIR/issue-72649-uninit-in-loop.rs:36:26
--> $DIR/issue-72649-uninit-in-loop.rs:42:26
|
LL | let value = NonCopy{};
| ----- move occurs because `value` has type `NonCopy`, which does not implement the `Copy` trait
@ -34,10 +37,13 @@ note: if `NonCopy` implemented `Clone`, you could clone the value
--> $DIR/issue-72649-uninit-in-loop.rs:5:1
|
LL | struct NonCopy;
| ^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | let _used = value;
| ----- you could clone this value
error[E0382]: use of moved value: `value`
--> $DIR/issue-72649-uninit-in-loop.rs:46:21
--> $DIR/issue-72649-uninit-in-loop.rs:52:21
|
LL | let value = NonCopy{};
| ----- move occurs because `value` has type `NonCopy`, which does not implement the `Copy` trait
@ -51,10 +57,13 @@ note: if `NonCopy` implemented `Clone`, you could clone the value
--> $DIR/issue-72649-uninit-in-loop.rs:5:1
|
LL | struct NonCopy;
| ^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | let _used = value;
| ----- you could clone this value
error[E0382]: use of moved value: `value`
--> $DIR/issue-72649-uninit-in-loop.rs:57:22
--> $DIR/issue-72649-uninit-in-loop.rs:64:22
|
LL | let mut value = NonCopy{};
| --------- move occurs because `value` has type `NonCopy`, which does not implement the `Copy` trait
@ -68,10 +77,13 @@ note: if `NonCopy` implemented `Clone`, you could clone the value
--> $DIR/issue-72649-uninit-in-loop.rs:5:1
|
LL | struct NonCopy;
| ^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | let _used2 = value;
| ----- you could clone this value
error[E0381]: used binding `value` isn't initialized
--> $DIR/issue-72649-uninit-in-loop.rs:65:21
--> $DIR/issue-72649-uninit-in-loop.rs:73:21
|
LL | let value: NonCopy;
| ----- binding declared here but left uninitialized
@ -84,7 +96,7 @@ LL | let value: NonCopy = /* value */;
| +++++++++++++
error[E0381]: used binding `value` isn't initialized
--> $DIR/issue-72649-uninit-in-loop.rs:73:21
--> $DIR/issue-72649-uninit-in-loop.rs:81:21
|
LL | let mut value: NonCopy;
| --------- binding declared here but left uninitialized

5
tests/ui/moves/issue-75904-move-closure-loop.stderr
View file

@ -15,7 +15,10 @@ note: if `NotCopy` implemented `Clone`, you could clone the value
--> $DIR/issue-75904-move-closure-loop.rs:5:1
|
LL | struct NotCopy;
| ^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | a;
| - you could clone this value
error: aborting due to 1 previous error

10
tests/ui/moves/move-fn-self-receiver.stderr
View file

@ -106,7 +106,10 @@ note: if `Foo` implemented `Clone`, you could clone the value
--> $DIR/move-fn-self-receiver.rs:5:1
|
LL | struct Foo;
| ^^^^^^^^^^
| ^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | let ret = mut_foo.use_mut_self();
| ------- you could clone this value
error[E0382]: use of moved value: `rc_foo`
--> $DIR/move-fn-self-receiver.rs:55:5
@ -142,7 +145,10 @@ note: if `Foo` implemented `Clone`, you could clone the value
--> $DIR/move-fn-self-receiver.rs:5:1
|
LL | struct Foo;
| ^^^^^^^^^^
| ^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | foo_add + Foo;
| ------- you could clone this value
note: calling this operator moves the left-hand side
--> $SRC_DIR/core/src/ops/arith.rs:LL:COL

5
tests/ui/moves/move-out-of-array-1.stderr
View file

@ -11,7 +11,10 @@ note: if `D` implemented `Clone`, you could clone the value
--> $DIR/move-out-of-array-1.rs:5:1
|
LL | struct D { _x: u8 }
| ^^^^^^^^
| ^^^^^^^^ consider implementing `Clone` for this type
...
LL | a[i]
| ---- you could clone this value
error: aborting due to 1 previous error

7
tests/ui/moves/moves-based-on-type-no-recursive-stack-closure.stderr
View file

@ -17,6 +17,13 @@ LL | let mut r = R {c: Box::new(f)};
LL | f(&mut r, false)
| ^ value borrowed here after move
|
help: if `F` implemented `Clone`, you could clone the value
--> $DIR/moves-based-on-type-no-recursive-stack-closure.rs:30:16
|
LL | fn conspirator<F>(mut f: F) where F: FnMut(&mut R, bool) {
| ^ consider constraining this type parameter with `Clone`
LL | let mut r = R {c: Box::new(f)};
| - you could clone this value
help: consider mutably borrowing `f`
|
LL | let mut r = R {c: Box::new(&mut f)};

4
tests/ui/moves/use_of_moved_value_copy_suggestions.fixed
View file

@ -3,6 +3,7 @@
fn duplicate_t<T: Copy>(t: T) -> (T, T) {
//~^ HELP consider restricting type parameter `T`
//~| HELP if `T` implemented `Clone`, you could clone the value
(t, t) //~ use of moved value: `t`
}
@ -72,10 +73,11 @@ where
#[rustfmt::skip]
fn existing_colon<T: Copy>(t: T) {
//~^ HELP consider restricting type parameter `T`
//~| HELP if `T` implemented `Clone`, you could clone the value
[t, t]; //~ use of moved value: `t`
}
fn existing_colon_in_where<T>(t: T)
fn existing_colon_in_where<T>(t: T) //~ HELP if `T` implemented `Clone`, you could clone the value
where
T:, T: Copy
//~^ HELP consider further restricting type parameter `T`

4
tests/ui/moves/use_of_moved_value_copy_suggestions.rs
View file

@ -3,6 +3,7 @@
fn duplicate_t<T>(t: T) -> (T, T) {
//~^ HELP consider restricting type parameter `T`
//~| HELP if `T` implemented `Clone`, you could clone the value
(t, t) //~ use of moved value: `t`
}
@ -72,10 +73,11 @@ fn duplicate_custom_4<T: A>(t: S<T>) -> (S<T>, S<T>)
#[rustfmt::skip]
fn existing_colon<T:>(t: T) {
//~^ HELP consider restricting type parameter `T`
//~| HELP if `T` implemented `Clone`, you could clone the value
[t, t]; //~ use of moved value: `t`
}
fn existing_colon_in_where<T>(t: T)
fn existing_colon_in_where<T>(t: T) //~ HELP if `T` implemented `Clone`, you could clone the value
where
T:,
//~^ HELP consider further restricting type parameter `T`

50
tests/ui/moves/use_of_moved_value_copy_suggestions.stderr
View file

@ -1,21 +1,29 @@
error[E0382]: use of moved value: `t`
--> $DIR/use_of_moved_value_copy_suggestions.rs:6:9
--> $DIR/use_of_moved_value_copy_suggestions.rs:7:9
|
LL | fn duplicate_t<T>(t: T) -> (T, T) {
| - move occurs because `t` has type `T`, which does not implement the `Copy` trait
LL |
...
LL | (t, t)
| - ^ value used here after move
| |
| value moved here
|
help: if `T` implemented `Clone`, you could clone the value
--> $DIR/use_of_moved_value_copy_suggestions.rs:4:16
|
LL | fn duplicate_t<T>(t: T) -> (T, T) {
| ^ consider constraining this type parameter with `Clone`
...
LL | (t, t)
| - you could clone this value
help: consider restricting type parameter `T`
|
LL | fn duplicate_t<T: Copy>(t: T) -> (T, T) {
| ++++++
error[E0382]: use of moved value: `t`
--> $DIR/use_of_moved_value_copy_suggestions.rs:11:9
--> $DIR/use_of_moved_value_copy_suggestions.rs:12:9
|
LL | fn duplicate_opt<T>(t: Option<T>) -> (Option<T>, Option<T>) {
| - move occurs because `t` has type `Option<T>`, which does not implement the `Copy` trait
@ -31,7 +39,7 @@ LL | fn duplicate_opt<T: Copy>(t: Option<T>) -> (Option<T>, Option<T>) {
| ++++++
error[E0382]: use of moved value: `t`
--> $DIR/use_of_moved_value_copy_suggestions.rs:16:9
--> $DIR/use_of_moved_value_copy_suggestions.rs:17:9
|
LL | fn duplicate_tup1<T>(t: (T,)) -> ((T,), (T,)) {
| - move occurs because `t` has type `(T,)`, which does not implement the `Copy` trait
@ -47,7 +55,7 @@ LL | fn duplicate_tup1<T: Copy>(t: (T,)) -> ((T,), (T,)) {
| ++++++
error[E0382]: use of moved value: `t`
--> $DIR/use_of_moved_value_copy_suggestions.rs:21:9
--> $DIR/use_of_moved_value_copy_suggestions.rs:22:9
|
LL | fn duplicate_tup2<A, B>(t: (A, B)) -> ((A, B), (A, B)) {
| - move occurs because `t` has type `(A, B)`, which does not implement the `Copy` trait
@ -63,7 +71,7 @@ LL | fn duplicate_tup2<A: Copy, B: Copy>(t: (A, B)) -> ((A, B), (A, B)) {
| ++++++ ++++++
error[E0382]: use of moved value: `t`
--> $DIR/use_of_moved_value_copy_suggestions.rs:26:9
--> $DIR/use_of_moved_value_copy_suggestions.rs:27:9
|
LL | fn duplicate_custom<T>(t: S<T>) -> (S<T>, S<T>) {
| - move occurs because `t` has type `S<T>`, which does not implement the `Copy` trait
@ -79,7 +87,7 @@ LL | fn duplicate_custom<T: Copy + Trait>(t: S<T>) -> (S<T>, S<T>) {
| ++++++++++++++
error[E0382]: use of moved value: `t`
--> $DIR/use_of_moved_value_copy_suggestions.rs:44:9
--> $DIR/use_of_moved_value_copy_suggestions.rs:45:9
|
LL | fn duplicate_custom_1<T>(t: S<T>) -> (S<T>, S<T>) where {
| - move occurs because `t` has type `S<T>`, which does not implement the `Copy` trait
@ -95,7 +103,7 @@ LL | fn duplicate_custom_1<T: Copy + Trait>(t: S<T>) -> (S<T>, S<T>) where {
| ++++++++++++++
error[E0382]: use of moved value: `t`
--> $DIR/use_of_moved_value_copy_suggestions.rs:52:9
--> $DIR/use_of_moved_value_copy_suggestions.rs:53:9
|
LL | fn duplicate_custom_2<T>(t: S<T>) -> (S<T>, S<T>)
| - move occurs because `t` has type `S<T>`, which does not implement the `Copy` trait
@ -111,7 +119,7 @@ LL | T: A + Copy + Trait,
| ++++++++++++++
error[E0382]: use of moved value: `t`
--> $DIR/use_of_moved_value_copy_suggestions.rs:61:9
--> $DIR/use_of_moved_value_copy_suggestions.rs:62:9
|
LL | fn duplicate_custom_3<T>(t: S<T>) -> (S<T>, S<T>)
| - move occurs because `t` has type `S<T>`, which does not implement the `Copy` trait
@ -127,7 +135,7 @@ LL | T: A + Copy + Trait,
| ++++++++++++++
error[E0382]: use of moved value: `t`
--> $DIR/use_of_moved_value_copy_suggestions.rs:69:9
--> $DIR/use_of_moved_value_copy_suggestions.rs:70:9
|
LL | fn duplicate_custom_4<T: A>(t: S<T>) -> (S<T>, S<T>)
| - move occurs because `t` has type `S<T>`, which does not implement the `Copy` trait
@ -143,23 +151,31 @@ LL | fn duplicate_custom_4<T: A + Copy + Trait>(t: S<T>) -> (S<T>, S<T>)
| ++++++++++++++
error[E0382]: use of moved value: `t`
--> $DIR/use_of_moved_value_copy_suggestions.rs:75:9
--> $DIR/use_of_moved_value_copy_suggestions.rs:77:9
|
LL | fn existing_colon<T:>(t: T) {
| - move occurs because `t` has type `T`, which does not implement the `Copy` trait
LL |
...
LL | [t, t];
| - ^ value used here after move
| |
| value moved here
|
help: if `T` implemented `Clone`, you could clone the value
--> $DIR/use_of_moved_value_copy_suggestions.rs:74:19
|
LL | fn existing_colon<T:>(t: T) {
| ^ consider constraining this type parameter with `Clone`
...
LL | [t, t];
| - you could clone this value
help: consider restricting type parameter `T`
|
LL | fn existing_colon<T: Copy>(t: T) {
| ++++
error[E0382]: use of moved value: `t`
--> $DIR/use_of_moved_value_copy_suggestions.rs:83:9
--> $DIR/use_of_moved_value_copy_suggestions.rs:85:9
|
LL | fn existing_colon_in_where<T>(t: T)
| - move occurs because `t` has type `T`, which does not implement the `Copy` trait
@ -169,6 +185,14 @@ LL | [t, t];
| |
| value moved here
|
help: if `T` implemented `Clone`, you could clone the value
--> $DIR/use_of_moved_value_copy_suggestions.rs:80:28
|
LL | fn existing_colon_in_where<T>(t: T)
| ^ consider constraining this type parameter with `Clone`
...
LL | [t, t];
| - you could clone this value
help: consider further restricting type parameter `T`
|
LL | T:, T: Copy

10
tests/ui/nll/issue-21232-partial-init-and-use.stderr
View file

@ -32,7 +32,10 @@ note: if `S<Box<u32>>` implemented `Clone`, you could clone the value
--> $DIR/issue-21232-partial-init-and-use.rs:15:1
|
LL | struct S<Y> {
| ^^^^^^^^^^^
| ^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | let mut s: S<B> = S::new(); drop(s);
| - you could clone this value
error[E0382]: assign to part of moved value: `t`
--> $DIR/issue-21232-partial-init-and-use.rs:116:5
@ -83,7 +86,10 @@ note: if `S<Box<u32>>` implemented `Clone`, you could clone the value
--> $DIR/issue-21232-partial-init-and-use.rs:15:1
|
LL | struct S<Y> {
| ^^^^^^^^^^^
| ^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | let mut s: S<B> = S::new(); drop(s);
| - you could clone this value
error[E0382]: assign to part of moved value: `t`
--> $DIR/issue-21232-partial-init-and-use.rs:142:5

30
tests/ui/nll/move-errors.stderr
View file

@ -8,7 +8,10 @@ note: if `A` implemented `Clone`, you could clone the value
--> $DIR/move-errors.rs:1:1
|
LL | struct A(String);
| ^^^^^^^^
| ^^^^^^^^ consider implementing `Clone` for this type
...
LL | let b = *a;
| -- you could clone this value
help: consider removing the dereference here
|
LL - let b = *a;
@ -28,7 +31,10 @@ note: if `A` implemented `Clone`, you could clone the value
--> $DIR/move-errors.rs:1:1
|
LL | struct A(String);
| ^^^^^^^^
| ^^^^^^^^ consider implementing `Clone` for this type
...
LL | let b = a[0];
| ---- you could clone this value
help: consider borrowing here
|
LL | let b = &a[0];
@ -44,7 +50,10 @@ note: if `A` implemented `Clone`, you could clone the value
--> $DIR/move-errors.rs:1:1
|
LL | struct A(String);
| ^^^^^^^^
| ^^^^^^^^ consider implementing `Clone` for this type
...
LL | let s = **r;
| --- you could clone this value
help: consider removing the dereference here
|
LL - let s = **r;
@ -61,7 +70,10 @@ note: if `A` implemented `Clone`, you could clone the value
--> $DIR/move-errors.rs:1:1
|
LL | struct A(String);
| ^^^^^^^^
| ^^^^^^^^ consider implementing `Clone` for this type
...
LL | let s = *r;
| -- you could clone this value
help: consider removing the dereference here
|
LL - let s = *r;
@ -81,7 +93,10 @@ note: if `A` implemented `Clone`, you could clone the value
--> $DIR/move-errors.rs:1:1
|
LL | struct A(String);
| ^^^^^^^^
| ^^^^^^^^ consider implementing `Clone` for this type
...
LL | let a = [A("".to_string())][0];
| ---------------------- you could clone this value
help: consider borrowing here
|
LL | let a = &[A("".to_string())][0];
@ -126,7 +141,10 @@ note: if `A` implemented `Clone`, you could clone the value
--> $DIR/move-errors.rs:1:1
|
LL | struct A(String);
| ^^^^^^^^
| ^^^^^^^^ consider implementing `Clone` for this type
...
LL | b = *a;
| -- you could clone this value
error[E0508]: cannot move out of type `[B; 1]`, a non-copy array
--> $DIR/move-errors.rs:74:11

10
tests/ui/pattern/bindings-after-at/borrowck-pat-ref-mut-and-ref.stderr
View file

@ -337,7 +337,10 @@ note: if `U` implemented `Clone`, you could clone the value
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:17:5
|
LL | struct U;
| ^^^^^^^^
| ^^^^^^^^ consider implementing `Clone` for this type
...
LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { drop(b); false } => {}
| - you could clone this value
error[E0507]: cannot move out of `b` in pattern guard
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:103:66
@ -350,7 +353,10 @@ note: if `U` implemented `Clone`, you could clone the value
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:17:5
|
LL | struct U;
| ^^^^^^^^
| ^^^^^^^^ consider implementing `Clone` for this type
...
LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { drop(b); false } => {}
| - you could clone this value
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
error[E0507]: cannot move out of `a` in pattern guard

17
tests/ui/suggestions/option-content-move3.rs Normal file
View file

@ -0,0 +1,17 @@
#[derive(Debug, Clone)]
struct NotCopyable;
fn func<F: FnMut() -> H, H: FnMut()>(_: F) {}
fn parse() {
let mut var = NotCopyable;
func(|| {
// Shouldn't suggest `move ||.as_ref()` here
move || { //~ ERROR cannot move out of `var`
let x = var; //~ ERROR cannot move out of `var`
println!("{x:?}");
}
});
}
fn main() {}

35
tests/ui/suggestions/option-content-move3.stderr Normal file
View file

@ -0,0 +1,35 @@
error[E0507]: cannot move out of `var`, a captured variable in an `FnMut` closure
--> $DIR/option-content-move3.rs:11:21
|
LL | let mut var = NotCopyable;
| ------- captured outer variable
...
LL | move || {
| ------- captured by this `FnMut` closure
LL | let x = var;
| ^^^ move occurs because `var` has type `NotCopyable`, which does not implement the `Copy` trait
|
help: consider borrowing here
|
LL | let x = &var;
| +
error[E0507]: cannot move out of `var`, a captured variable in an `FnMut` closure
--> $DIR/option-content-move3.rs:10:9
|
LL | let mut var = NotCopyable;
| ------- captured outer variable
LL | func(|| {
| -- captured by this `FnMut` closure
LL | // Shouldn't suggest `move ||.as_ref()` here
LL | move || {
| ^^^^^^^ `var` is moved here
LL | let x = var;
| ---
| |
| variable moved due to use in closure
| move occurs because `var` has type `NotCopyable`, which does not implement the `Copy` trait
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0507`.

5
tests/ui/union/union-borrow-move-parent-sibling.stderr
View file

@ -54,7 +54,10 @@ note: if `MockVec<u8>` implemented `Clone`, you could clone the value
--> $DIR/union-borrow-move-parent-sibling.rs:25:1
|
LL | struct MockVec<T> {
| ^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | let a = (u.x.0).0;
| --------- you could clone this value
help: consider borrowing here
|
LL | let a = &(u.x.0).0;

10
tests/ui/union/union-move.stderr
View file

@ -20,7 +20,10 @@ note: if `U1` implemented `Clone`, you could clone the value
--> $DIR/union-move.rs:9:1
|
LL | union U1 {
| ^^^^^^^^
| ^^^^^^^^ consider implementing `Clone` for this type
...
LL | move_out(x.f1_nocopy);
| ----------- you could clone this value
error[E0382]: use of moved value: `x`
--> $DIR/union-move.rs:42:18
@ -44,7 +47,10 @@ note: if `U1` implemented `Clone`, you could clone the value
--> $DIR/union-move.rs:9:1
|
LL | union U1 {
| ^^^^^^^^
| ^^^^^^^^ consider implementing `Clone` for this type
...
LL | move_out(x.f2_nocopy);
| ----------- you could clone this value
error[E0509]: cannot move out of type `U2`, which implements the `Drop` trait
--> $DIR/union-move.rs:49:18

34
tests/ui/unop-move-semantics.stderr
View file

@ -33,6 +33,14 @@ LL | !x;
...
LL | use_mut(n); use_imm(m);
| - borrow later used here
|
help: if `T` implemented `Clone`, you could clone the value
--> $DIR/unop-move-semantics.rs:11:18
|
LL | fn move_borrowed<T: Not<Output=T>>(x: T, mut y: T) {
| ^ consider constraining this type parameter with `Clone`
LL | let m = &x;
| -- you could clone this value
error[E0505]: cannot move out of `y` because it is borrowed
--> $DIR/unop-move-semantics.rs:17:6
@ -47,6 +55,15 @@ LL | !y;
| ^ move out of `y` occurs here
LL | use_mut(n); use_imm(m);
| - borrow later used here
|
help: if `T` implemented `Clone`, you could clone the value
--> $DIR/unop-move-semantics.rs:11:18
|
LL | fn move_borrowed<T: Not<Output=T>>(x: T, mut y: T) {
| ^ consider constraining this type parameter with `Clone`
LL | let m = &x;
LL | let n = &mut y;
| ------ you could clone this value
error[E0507]: cannot move out of `*m` which is behind a mutable reference
--> $DIR/unop-move-semantics.rs:24:6
@ -59,6 +76,14 @@ LL | !*m;
|
note: calling this operator moves the value
--> $SRC_DIR/core/src/ops/bit.rs:LL:COL
help: if `T` implemented `Clone`, you could clone the value
--> $DIR/unop-move-semantics.rs:20:24
|
LL | fn illegal_dereference<T: Not<Output=T>>(mut x: T, y: T) {
| ^ consider constraining this type parameter with `Clone`
...
LL | !*m;
| -- you could clone this value
error[E0507]: cannot move out of `*n` which is behind a shared reference
--> $DIR/unop-move-semantics.rs:26:6
@ -68,6 +93,15 @@ LL | !*n;
| ||
| |move occurs because `*n` has type `T`, which does not implement the `Copy` trait
| `*n` moved due to usage in operator
|
help: if `T` implemented `Clone`, you could clone the value
--> $DIR/unop-move-semantics.rs:20:24
|
LL | fn illegal_dereference<T: Not<Output=T>>(mut x: T, y: T) {
| ^ consider constraining this type parameter with `Clone`
...
LL | !*n;
| -- you could clone this value
error: aborting due to 5 previous errors

15
tests/ui/variance/variance-issue-20533.stderr
View file

@ -14,7 +14,10 @@ note: if `AffineU32` implemented `Clone`, you could clone the value
--> $DIR/variance-issue-20533.rs:26:1
|
LL | struct AffineU32(u32);
| ^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | let x = foo(&a);
| -- you could clone this value
error[E0505]: cannot move out of `a` because it is borrowed
--> $DIR/variance-issue-20533.rs:41:14
@ -32,7 +35,10 @@ note: if `AffineU32` implemented `Clone`, you could clone the value
--> $DIR/variance-issue-20533.rs:26:1
|
LL | struct AffineU32(u32);
| ^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | let x = bar(&a);
| -- you could clone this value
error[E0505]: cannot move out of `a` because it is borrowed
--> $DIR/variance-issue-20533.rs:47:14
@ -50,7 +56,10 @@ note: if `AffineU32` implemented `Clone`, you could clone the value
--> $DIR/variance-issue-20533.rs:26:1
|
LL | struct AffineU32(u32);
| ^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | let x = baz(&a);
| -- you could clone this value
error[E0505]: cannot move out of `a` because it is borrowed
--> $DIR/variance-issue-20533.rs:53:14