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More move error suggestions to clone

Browse Source 
```
error[E0507]: cannot move out of `val`, a captured variable in an `FnMut` closure
  --> $DIR/issue-87456-point-to-closure.rs:10:28
   |
LL |     let val = String::new();
   |         --- captured outer variable
LL |
LL |     take_mut(|| {
   |              -- captured by this `FnMut` closure
LL |
LL |         let _foo: String = val;
   |                            ^^^ move occurs because `val` has type `String`, which does not implement the `Copy` trait
   |
help: consider borrowing here
   |
LL |         let _foo: String = &val;
   |                            +
help: consider cloning the value if the performance cost is acceptable
   |
LL |         let _foo: String = val.clone();
   |                               ++++++++
```
This commit is contained in:
Esteban Küber 2024-03-13 05:26:03 +00:00
parent 10c2fbec24
commit 065454dd1d
12 changed files with 97 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
compiler/rustc_borrowck/src/diagnostics/move_errors.rs
View File

@ -444,6 +444,10 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
None => "value".to_string(),
};
if let Some(expr) = self.find_expr(span) {
self.suggest_cloning(err, place_ty, expr, span);
}
err.subdiagnostic(
self.dcx(),
crate::session_diagnostics::TypeNoCopy::Label {

2
tests/ui/borrowck/borrowck-issue-2657-2.fixed
View File

@ -5,7 +5,7 @@ fn main() {
match x {
Some(ref y) => {
let _b = y; //~ ERROR cannot move out
let _b = y.clone(); //~ ERROR cannot move out
}
_ => {}
}

5
tests/ui/borrowck/borrowck-issue-2657-2.stderr
View File

@ -9,6 +9,11 @@ help: consider removing the dereference here
LL - let _b = *y;
LL + let _b = y;
|
help: consider cloning the value if the performance cost is acceptable
|
LL - let _b = *y;
LL + let _b = y.clone();
|
error: aborting due to 1 previous error

5
tests/ui/borrowck/borrowck-move-from-unsafe-ptr.stderr
View File

@ -9,6 +9,11 @@ help: consider removing the dereference here
LL - let y = *x;
LL + let y = x;
|
help: consider cloning the value if the performance cost is acceptable
|
LL - let y = *x;
LL + let y = x.clone();
|
error: aborting due to 1 previous error

5
tests/ui/borrowck/borrowck-move-out-of-overloaded-deref.stderr
View File

@ -9,6 +9,11 @@ help: consider removing the dereference here
LL - let _x = *Rc::new("hi".to_string());
LL + let _x = Rc::new("hi".to_string());
|
help: consider cloning the value if the performance cost is acceptable
|
LL - let _x = *Rc::new("hi".to_string());
LL + let _x = Rc::new("hi".to_string()).clone();
|
error: aborting due to 1 previous error

4
tests/ui/borrowck/borrowck-overloaded-index-move-from-vec.stderr
View File

@ -8,6 +8,10 @@ help: consider borrowing here
|
LL | let bad = &v[0];
| +
help: consider cloning the value if the performance cost is acceptable
|
LL | let bad = v[0].clone();
| ++++++++
error: aborting due to 1 previous error

3
tests/ui/borrowck/borrowck-vec-pattern-nesting.rs
View File

@ -47,6 +47,7 @@ fn c() {
//~| NOTE cannot move out of here
//~| NOTE move occurs because
//~| HELP consider borrowing here
//~| HELP consider cloning
}
fn d() {
@ -66,6 +67,7 @@ fn d() {
//~| NOTE cannot move out of here
//~| NOTE move occurs because
//~| HELP consider borrowing here
//~| HELP consider cloning
}
fn e() {
@ -86,6 +88,7 @@ fn e() {
//~| NOTE cannot move out of here
//~| NOTE move occurs because
//~| HELP consider borrowing here
//~| HELP consider cloning
}
fn main() {}

20
tests/ui/borrowck/borrowck-vec-pattern-nesting.stderr
View File

@ -53,9 +53,13 @@ help: consider borrowing here
|
LL | let a = &vec[0];
| +
help: consider cloning the value if the performance cost is acceptable
|
LL | let a = vec[0].clone();
| ++++++++
error[E0508]: cannot move out of type `[Box<isize>]`, a non-copy slice
--> $DIR/borrowck-vec-pattern-nesting.rs:55:11
--> $DIR/borrowck-vec-pattern-nesting.rs:56:11
|
LL | match vec {
| ^^^ cannot move out of here
@ -73,7 +77,7 @@ LL + [
|
error[E0508]: cannot move out of type `[Box<isize>]`, a non-copy slice
--> $DIR/borrowck-vec-pattern-nesting.rs:65:13
--> $DIR/borrowck-vec-pattern-nesting.rs:66:13
|
LL | let a = vec[0];
| ^^^^^^
@ -85,9 +89,13 @@ help: consider borrowing here
|
LL | let a = &vec[0];
| +
help: consider cloning the value if the performance cost is acceptable
|
LL | let a = vec[0].clone();
| ++++++++
error[E0508]: cannot move out of type `[Box<isize>]`, a non-copy slice
--> $DIR/borrowck-vec-pattern-nesting.rs:74:11
--> $DIR/borrowck-vec-pattern-nesting.rs:76:11
|
LL | match vec {
| ^^^ cannot move out of here
@ -106,7 +114,7 @@ LL + [_a, _b, _c] => {}
|
error[E0508]: cannot move out of type `[Box<isize>]`, a non-copy slice
--> $DIR/borrowck-vec-pattern-nesting.rs:85:13
--> $DIR/borrowck-vec-pattern-nesting.rs:87:13
|
LL | let a = vec[0];
| ^^^^^^
@ -118,6 +126,10 @@ help: consider borrowing here
|
LL | let a = &vec[0];
| +
help: consider cloning the value if the performance cost is acceptable
|
LL | let a = vec[0].clone();
| ++++++++
error: aborting due to 8 previous errors

4
tests/ui/borrowck/issue-87456-point-to-closure.stderr
View File

@ -14,6 +14,10 @@ help: consider borrowing here
|
LL | let _foo: String = &val;
| +
help: consider cloning the value if the performance cost is acceptable
|
LL | let _foo: String = val.clone();
| ++++++++
error: aborting due to 1 previous error

4
tests/ui/check-static-values-constraints.stderr
View File

@ -160,6 +160,10 @@ help: consider borrowing here
|
LL | &x
| +
help: consider cloning the value if the performance cost is acceptable
|
LL | x.clone()
| ++++++++
error: aborting due to 17 previous errors

4
tests/ui/issues/issue-40402-ref-hints/issue-40402-1.stderr
View File

@ -8,6 +8,10 @@ help: consider borrowing here
|
LL | let e = &f.v[0];
| +
help: consider cloning the value if the performance cost is acceptable
|
LL | let e = f.v[0].clone();
| ++++++++
error: aborting due to 1 previous error

42
tests/ui/nll/cannot-move-block-spans.stderr
View File

@ -9,6 +9,11 @@ help: consider removing the dereference here
LL - let x = { *r };
LL + let x = { r };
|
help: consider cloning the value if the performance cost is acceptable
|
LL - let x = { *r };
LL + let x = { r.clone() };
|
error[E0507]: cannot move out of `*r` which is behind a shared reference
--> $DIR/cannot-move-block-spans.rs:6:22
@ -21,6 +26,11 @@ help: consider removing the dereference here
LL - let y = unsafe { *r };
LL + let y = unsafe { r };
|
help: consider cloning the value if the performance cost is acceptable
|
LL - let y = unsafe { *r };
LL + let y = unsafe { r.clone() };
|
error[E0507]: cannot move out of `*r` which is behind a shared reference
--> $DIR/cannot-move-block-spans.rs:7:26
@ -33,6 +43,11 @@ help: consider removing the dereference here
LL - let z = loop { break *r; };
LL + let z = loop { break r; };
|
help: consider cloning the value if the performance cost is acceptable
|
LL - let z = loop { break *r; };
LL + let z = loop { break r.clone(); };
|
error[E0508]: cannot move out of type `[String; 2]`, a non-copy array
--> $DIR/cannot-move-block-spans.rs:11:15
@ -47,6 +62,10 @@ help: consider borrowing here
|
LL | let x = { &arr[0] };
| +
help: consider cloning the value if the performance cost is acceptable
|
LL | let x = { arr[0].clone() };
| ++++++++
error[E0508]: cannot move out of type `[String; 2]`, a non-copy array
--> $DIR/cannot-move-block-spans.rs:12:22
@ -61,6 +80,10 @@ help: consider borrowing here
|
LL | let y = unsafe { &arr[0] };
| +
help: consider cloning the value if the performance cost is acceptable
|
LL | let y = unsafe { arr[0].clone() };
| ++++++++
error[E0508]: cannot move out of type `[String; 2]`, a non-copy array
--> $DIR/cannot-move-block-spans.rs:13:26
@ -75,6 +98,10 @@ help: consider borrowing here
|
LL | let z = loop { break &arr[0]; };
| +
help: consider cloning the value if the performance cost is acceptable
|
LL | let z = loop { break arr[0].clone(); };
| ++++++++
error[E0507]: cannot move out of `*r` which is behind a shared reference
--> $DIR/cannot-move-block-spans.rs:17:38
@ -87,6 +114,11 @@ help: consider removing the dereference here
LL - let x = { let mut u = 0; u += 1; *r };
LL + let x = { let mut u = 0; u += 1; r };
|
help: consider cloning the value if the performance cost is acceptable
|
LL - let x = { let mut u = 0; u += 1; *r };
LL + let x = { let mut u = 0; u += 1; r.clone() };
|
error[E0507]: cannot move out of `*r` which is behind a shared reference
--> $DIR/cannot-move-block-spans.rs:18:45
@ -99,6 +131,11 @@ help: consider removing the dereference here
LL - let y = unsafe { let mut u = 0; u += 1; *r };
LL + let y = unsafe { let mut u = 0; u += 1; r };
|
help: consider cloning the value if the performance cost is acceptable
|
LL - let y = unsafe { let mut u = 0; u += 1; *r };
LL + let y = unsafe { let mut u = 0; u += 1; r.clone() };
|
error[E0507]: cannot move out of `*r` which is behind a shared reference
--> $DIR/cannot-move-block-spans.rs:19:49
@ -111,6 +148,11 @@ help: consider removing the dereference here
LL - let z = loop { let mut u = 0; u += 1; break *r; u += 2; };
LL + let z = loop { let mut u = 0; u += 1; break r; u += 2; };
|
help: consider cloning the value if the performance cost is acceptable
|
LL - let z = loop { let mut u = 0; u += 1; break *r; u += 2; };
LL + let z = loop { let mut u = 0; u += 1; break r.clone(); u += 2; };
|
error: aborting due to 9 previous errors