d68f2a6b71
```
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;
| +
```
89 lines
2.3 KiB
Rust
89 lines
2.3 KiB
Rust
//@ run-rustfix
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#![allow(dead_code)]
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fn duplicate_t<T: Copy>(t: T) -> (T, T) {
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//~^ HELP consider restricting type parameter `T`
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//~| HELP if `T` implemented `Clone`, you could clone the value
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(t, t) //~ use of moved value: `t`
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}
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fn duplicate_opt<T: Copy>(t: Option<T>) -> (Option<T>, Option<T>) {
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//~^ HELP consider restricting type parameter `T`
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(t, t) //~ use of moved value: `t`
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}
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fn duplicate_tup1<T: Copy>(t: (T,)) -> ((T,), (T,)) {
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//~^ HELP consider restricting type parameter `T`
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(t, t) //~ use of moved value: `t`
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}
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fn duplicate_tup2<A: Copy, B: Copy>(t: (A, B)) -> ((A, B), (A, B)) {
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//~^ HELP consider restricting type parameters
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(t, t) //~ use of moved value: `t`
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}
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fn duplicate_custom<T: Copy + Trait>(t: S<T>) -> (S<T>, S<T>) {
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//~^ HELP consider restricting type parameter `T`
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(t, t) //~ use of moved value: `t`
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}
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struct S<T>(T);
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trait Trait {}
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impl<T: Trait + Clone> Clone for S<T> {
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fn clone(&self) -> Self {
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Self(self.0.clone())
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}
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}
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impl<T: Trait + Copy> Copy for S<T> {}
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trait A {}
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trait B {}
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// Test where bounds are added with different bound placements
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fn duplicate_custom_1<T: Copy + Trait>(t: S<T>) -> (S<T>, S<T>) where {
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//~^ HELP consider restricting type parameter `T`
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(t, t) //~ use of moved value: `t`
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}
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fn duplicate_custom_2<T>(t: S<T>) -> (S<T>, S<T>)
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where
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T: A + Copy + Trait,
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//~^ HELP consider further restricting this bound
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{
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(t, t) //~ use of moved value: `t`
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}
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fn duplicate_custom_3<T>(t: S<T>) -> (S<T>, S<T>)
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where
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T: A + Copy + Trait,
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//~^ HELP consider further restricting this bound
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T: B,
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{
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(t, t) //~ use of moved value: `t`
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}
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fn duplicate_custom_4<T: A + Copy + Trait>(t: S<T>) -> (S<T>, S<T>)
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//~^ HELP consider further restricting this bound
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where
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T: B,
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{
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(t, t) //~ use of moved value: `t`
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}
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#[rustfmt::skip]
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fn existing_colon<T: Copy>(t: T) {
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//~^ HELP consider restricting type parameter `T`
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//~| HELP if `T` implemented `Clone`, you could clone the value
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[t, t]; //~ use of moved value: `t`
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}
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fn existing_colon_in_where<T>(t: T) //~ HELP if `T` implemented `Clone`, you could clone the value
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where
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T:, T: Copy
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//~^ HELP consider further restricting type parameter `T`
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{
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[t, t]; //~ use of moved value: `t`
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}
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fn main() {}
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