rust/tests/ui/borrowck/issue-54499-field-mutation-of-moved-out.stderr
Esteban Küber 11061831f7 Mention type that could be Clone but isn't in more cases
When encountering a moved value of a type that isn't `Clone` because of unmet obligations, but where all the unmet predicates reference crate-local types, mention them and suggest cloning, as we do in other cases already:

```
error[E0507]: cannot move out of `foo`, a captured variable in an `Fn` closure
  --> f111.rs:14:25
   |
13 | fn do_stuff(foo: Option<Foo>) {
   |             --- captured outer variable
14 |     require_fn_trait(|| async {
   |                      -- ^^^^^ `foo` is moved here
   |                      |
   |                      captured by this `Fn` closure
15 |         if foo.map_or(false, |f| f.foo()) {
   |            ---
   |            |
   |            variable moved due to use in coroutine
   |            move occurs because `foo` has type `Option<Foo>`, which does not implement the `Copy` trait
   |
note: if `Foo` implemented `Clone`, you could clone the value
  --> f111.rs:4:1
   |
4  | struct Foo;
   | ^^^^^^^^^^ consider implementing `Clone` for this type
...
15 |         if foo.map_or(false, |f| f.foo()) {
   |            --- you could clone this value
```
2025-07-25 18:34:10 +00:00

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error[E0594]: cannot assign to `t.0`, as `t` is not declared as mutable
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:13:9
|
LL | t.0 = S(1);
| ^^^^^^^^^^ cannot assign
|
help: consider changing this to be mutable
|
LL | let mut t: Tuple = (S(0), 0);
| +++
error[E0382]: assign to part of moved value: `t`
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:13:9
|
LL | let t: Tuple = (S(0), 0);
| - move occurs because `t` has type `(S, i32)`, which does not implement the `Copy` trait
LL | drop(t);
| - value moved here
LL | t.0 = S(1);
| ^^^^^^^^^^ value partially assigned here after move
error[E0594]: cannot assign to `t.1`, as `t` is not declared as mutable
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:16:9
|
LL | t.1 = 2;
| ^^^^^^^ cannot assign
|
help: consider changing this to be mutable
|
LL | let mut t: Tuple = (S(0), 0);
| +++
error[E0594]: cannot assign to `u.0`, as `u` is not declared as mutable
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:24:9
|
LL | u.0 = S(1);
| ^^^^^^^^^^ cannot assign
|
help: consider changing this to be mutable
|
LL | let mut u: Tpair = Tpair(S(0), 0);
| +++
error[E0382]: assign to part of moved value: `u`
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:24:9
|
LL | let u: Tpair = Tpair(S(0), 0);
| - move occurs because `u` has type `Tpair`, which does not implement the `Copy` trait
LL | drop(u);
| - value moved here
LL | u.0 = S(1);
| ^^^^^^^^^^ value partially assigned here after move
|
note: if `Tpair` implemented `Clone`, you could clone the value
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:6:1
|
LL | struct Tpair(S, i32);
| ^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | drop(u);
| - you could clone this value
error[E0594]: cannot assign to `u.1`, as `u` is not declared as mutable
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:27:9
|
LL | u.1 = 2;
| ^^^^^^^ cannot assign
|
help: consider changing this to be mutable
|
LL | let mut u: Tpair = Tpair(S(0), 0);
| +++
error[E0594]: cannot assign to `v.x`, as `v` is not declared as mutable
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:35:9
|
LL | v.x = S(1);
| ^^^^^^^^^^ cannot assign
|
help: consider changing this to be mutable
|
LL | let mut v: Spair = Spair { x: S(0), y: 0 };
| +++
error[E0382]: assign to part of moved value: `v`
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:35:9
|
LL | let v: Spair = Spair { x: S(0), y: 0 };
| - move occurs because `v` has type `Spair`, which does not implement the `Copy` trait
LL | drop(v);
| - value moved here
LL | v.x = S(1);
| ^^^^^^^^^^ value partially assigned here after move
|
note: if `Spair` implemented `Clone`, you could clone the value
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:7:1
|
LL | struct Spair { x: S, y: i32 }
| ^^^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | drop(v);
| - you could clone this value
error[E0594]: cannot assign to `v.y`, as `v` is not declared as mutable
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:38:9
|
LL | v.y = 2;
| ^^^^^^^ cannot assign
|
help: consider changing this to be mutable
|
LL | let mut v: Spair = Spair { x: S(0), y: 0 };
| +++
error: aborting due to 9 previous errors
Some errors have detailed explanations: E0382, E0594.
For more information about an error, try `rustc --explain E0382`.