rust/tests/ui/borrowck/issue-103624.stderr
Esteban Küber d68f2a6b71 Mention when type parameter could be Clone
```
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;
   |              +
```
2024-04-24 22:21:15 +00:00

45 lines
1.5 KiB
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error[E0507]: cannot move out of `self.b`, as `self` is a captured variable in an `Fn` closure
--> $DIR/issue-103624.rs:16:13
|
LL | async fn foo(&self) {
| ----- captured outer variable
LL | let bar = self.b.bar().await;
LL | spawn_blocking(move || {
| ------- captured by this `Fn` closure
LL |
LL | self.b;
| ^^^^^^ move occurs because `self.b` has type `StructB`, which does not implement the `Copy` trait
|
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
|
LL | async fn foo(&self) {
| -----
| |
| `self` is a reference that is only valid in the method body
| let's call the lifetime of this reference `'1`
LL | let bar = self.b.bar().await;
LL | / spawn_blocking(move || {
LL | |
LL | | self.b;
LL | |
LL | | })
| | ^
| | |
| |__________`self` escapes the method body here
| argument requires that `'1` must outlive `'static`
error: aborting due to 2 previous errors
Some errors have detailed explanations: E0507, E0521.
For more information about an error, try `rustc --explain E0507`.