Commit Graph

5 Commits

Author SHA1 Message Date
Esteban Küber
049c32797b On E0277, point at type that doesn't implement bound
When encountering an unmet trait bound, point at local type that doesn't implement the trait:

```
error[E0277]: the trait bound `Bar<T>: Foo` is not satisfied
  --> $DIR/issue-64855.rs:9:19
   |
LL | pub struct Bar<T>(<Self as Foo>::Type) where Self: ;
   |                   ^^^^^^^^^^^^^^^^^^^ unsatisfied trait bound
   |
help: the trait `Foo` is not implemented for `Bar<T>`
  --> $DIR/issue-64855.rs:9:1
   |
LL | pub struct Bar<T>(<Self as Foo>::Type) where Self: ;
   | ^^^^^^^^^^^^^^^^^
```
2025-08-22 17:55:15 +00:00
Esteban Küber
3f2a63a68b Use trait name instead of full constraint in suggestion message
```
help: consider restricting type parameter `T` with traits `Copy` and `Trait`
   |
LL | fn duplicate_custom<T: Copy + Trait>(t: S<T>) -> (S<T>, S<T>) {
   |                      ++++++++++++++
```

```
help: consider restricting type parameter `V` with trait `Copy`
   |
LL | fn index<'a, K, V: std::marker::Copy>(map: &'a HashMap<K, V>, k: K) -> &'a V {
   |                  +++++++++++++++++++
```
2024-12-07 21:29:58 +00:00
Esteban Küber
d13c34828e reword trait bound suggestion message to include the bounds 2024-12-07 21:26:20 +00:00
Esteban Küber
68253e14ee Don't suggest restricting bound with unstable traits on stable
On nightly, we mention the trait is unstable

```
error[E0277]: the trait bound `T: Unstable` is not satisfied
  --> $DIR/unstable-trait-suggestion.rs:13:9
   |
LL |     foo(t)
   |     --- ^ the trait `Unstable` is not implemented for `T`
   |     |
   |     required by a bound introduced by this call
   |
note: required by a bound in `foo`
  --> $DIR/unstable-trait-suggestion.rs:9:11
   |
LL | fn foo<T: Unstable>(_: T) {}
   |           ^^^^^^^^ required by this bound in `foo`
help: consider restricting type parameter `T` but it is an `unstable` trait
   |
LL | pub fn demo<T: Unstable>(t: T) {
   |              ++++++++++
```

On stable, we don't suggest the trait at all

```
error[E0277]: the trait bound `T: Unstable` is not satisfied
  --> $DIR/unstable-trait-suggestion.rs:13:9
   |
LL |     foo(t)
   |     --- ^ the trait `Unstable` is not implemented for `T`
   |     |
   |     required by a bound introduced by this call
   |
note: required by a bound in `foo`
  --> $DIR/unstable-trait-suggestion.rs:9:11
   |
LL | fn foo<T: Unstable>(_: T) {}
   |           ^^^^^^^^ required by this bound in `foo`
```
2024-12-07 21:10:44 +00:00
Albert Larsan
cf2dff2b1e Move /src/test to /tests 2023-01-11 09:32:08 +00:00