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Do not recomment cloning explicit &mut expressions

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This commit is contained in:
Esteban Küber 2024-03-13 16:35:58 +00:00
parent 5a7caa3174
commit 7f7f6792f1
3 changed files with 5 additions and 24 deletions
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5
compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs
View File

@ -1033,6 +1033,11 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
while let hir::ExprKind::AddrOf(.., inner) | hir::ExprKind::Unary(hir::UnOp::Deref, inner) =
&inner_expr.kind
{
if let hir::ExprKind::AddrOf(_, hir::Mutability::Mut, _) = inner_expr.kind {
// We assume that `&mut` refs are desired for their side-effects, so cloning the
// value wouldn't do what the user wanted.
return;
}
inner_expr = inner;
}
if inner_expr.span.lo() != expr.span.lo() {

12
tests/ui/borrowck/borrowck-overloaded-index-move-index.stderr
View File

@ -11,12 +11,6 @@ LL | println!("{}", f[s]);
...
LL | use_mut(rs);
| -- borrow later used here
|
help: consider cloning the value if the performance cost is acceptable
|
LL - let rs = &mut s;
LL + let rs = s.clone();
|
error[E0505]: cannot move out of `s` because it is borrowed
--> $DIR/borrowck-overloaded-index-move-index.rs:53:7
@ -31,12 +25,6 @@ LL | f[s] = 10;
...
LL | use_mut(rs);
| -- borrow later used here
|
help: consider cloning the value if the performance cost is acceptable
|
LL - let rs = &mut s;
LL + let rs = s.clone();
|
error[E0382]: use of moved value: `s`
--> $DIR/borrowck-overloaded-index-move-index.rs:53:7

12
tests/ui/nll/polonius/polonius-smoke-test.stderr
View File

@ -27,12 +27,6 @@ LL | let z = x;
| ^ move out of `x` occurs here
LL | y
| - returning this value requires that `*x` is borrowed for `'1`
|
help: consider cloning the value if the performance cost is acceptable
|
LL - let y = &mut *x;
LL + let y = x.clone();
|
error[E0505]: cannot move out of `s` because it is borrowed
--> $DIR/polonius-smoke-test.rs:42:5
@ -46,12 +40,6 @@ LL | s;
| ^ move out of `s` occurs here
LL | tmp;
| --- borrow later used here
|
help: consider cloning the value if the performance cost is acceptable
|
LL - let r = &mut *s;
LL + let r = s.clone();
|
error: aborting due to 4 previous errors