rust/tests/ui/union
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
..
auxiliary
unnamed-fields
field_checks.rs
field_checks.stderr
issue-41073.rs
issue-41073.stderr
issue-81199.rs
issue-81199.stderr
issue-99375.rs
projection-as-union-type-error-2.rs
projection-as-union-type-error-2.stderr
projection-as-union-type-error.rs
projection-as-union-type-error.stderr
projection-as-union-type.rs
union-align.rs
union-backcomp.rs
union-basic.rs
union-borrow-move-parent-sibling.rs
union-borrow-move-parent-sibling.stderr Mention when type parameter could be Clone 2024-04-24 22:21:15 +00:00
union-const-codegen.rs
union-const-eval-field.rs
union-const-eval.rs
union-const-pat.rs
union-const-pat.stderr
union-copy.rs
union-copy.stderr
union-deref.rs
union-deref.stderr
union-derive-clone.rs
union-derive-clone.stderr
union-derive-eq.rs
union-derive-eq.stderr
union-derive-rpass.rs
union-derive.rs
union-derive.stderr
union-drop-assign.rs
union-drop.rs
union-empty.rs
union-empty.stderr
union-fields-1.rs
union-fields-1.stderr
union-fields-2.rs
union-fields-2.stderr
union-generic-rpass.rs
union-generic.rs
union-generic.stderr
union-inherent-method.rs
union-lint-dead-code.rs
union-lint-dead-code.stderr
union-macro.rs
union-manuallydrop-rpass.rs
union-move.rs
union-move.stderr Mention when type parameter could be Clone 2024-04-24 22:21:15 +00:00
union-nodrop.rs
union-nonrepresentable.rs
union-nonrepresentable.stderr
union-nonzero.rs
union-overwrite.rs
union-packed.rs
union-pat-refutability.rs
union-repr-c.rs
union-repr-c.stderr
union-sized-field.rs
union-sized-field.stderr
union-suggest-field.rs
union-suggest-field.stderr
union-trait-impl.rs
union-transmute.rs
union-unsafe.rs
union-unsafe.stderr
union-unsized.rs
union-unsized.stderr
union-with-drop-fields.rs
union-with-drop-fields.stderr
unresolved-field-isnt-copy.rs
unresolved-field-isnt-copy.stderr