Commit graph

10 commits

Author SHA1 Message Date
Michael Goulet
91acacf85b Peel off explicit (or implicit) deref before suggesting clone on move error in borrowck 2024-07-26 14:41:56 -04:00
Michael Goulet
e7eae5370e Remove logic to suggest clone of function output 2024-07-26 13:56:06 -04:00
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
Esteban Küber
d97d2fe744 Mention when the type of the moved value doesn't implement Clone 2024-04-11 16:41:42 +00:00
Esteban Küber
a1a3abb08f When possible, suggest cloning the result of a call instead of an argument
```
error[E0505]: cannot move out of `a` because it is borrowed
  --> $DIR/variance-issue-20533.rs:28:14
   |
LL |         let a = AffineU32(1);
   |             - binding `a` declared here
LL |         let x = foo(&a);
   |                     -- borrow of `a` occurs here
LL |         drop(a);
   |              ^ move out of `a` occurs here
LL |         drop(x);
   |              - borrow later used here
   |
help: consider cloning the value if the performance cost is acceptable
   |
LL |         let x = foo(&a).clone();
   |                        ++++++++
```
2024-04-11 16:41:41 +00:00
Esteban Küber
5a7caa3174 Fix accuracy of T: Clone check in suggestion 2024-04-11 16:41:41 +00:00
Esteban Küber
bce78102c3 Account for unops when suggesting cloning 2024-04-11 16:41:41 +00:00
Esteban Küber
fa2fc3ab96 Suggest .clone() when moved while borrowed 2024-04-11 16:41:41 +00:00
Esteban Küber
656db98bd9 Tweak E0597
CC #99430
2023-01-15 19:46:20 +00:00
Albert Larsan
cf2dff2b1e
Move /src/test to /tests 2023-01-11 09:32:08 +00:00
Renamed from src/test/ui/variance/variance-issue-20533.stderr (Browse further)