Rollup of 5 pull requests#71826
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When encountering a binary operation involving a type parameter that has no bindings, suggest adding the appropriate bound.
When encountering a projection that isn't satisfied by a type parameter, suggest constraining the type parameter.
…ropriate syntax When encountering `where <A as Foo>::Bar = B`, it is possible that `Bar` is an associated type. If so, suggest `where A: Foo<Bar = B>`. CC rust-lang#20041.
This also tests for the ICE in rust-lang#71734
Provide suggestions for type parameters missing bounds for associated types
When implementing the binary operator traits it is easy to forget to restrict the `Output` associated type. `rustc` now accounts for different cases to lead users in the right direction to add the necessary restrictions. The structured suggestions in the following output are new:
```
error: equality constraints are not yet supported in `where` clauses
--> $DIR/missing-bounds.rs:37:33
|
LL | impl<B: Add> Add for E<B> where <B as Add>::Output = B {
| ^^^^^^^^^^^^^^^^^^^^^^ not supported
|
= note: see issue rust-lang#20041 <rust-lang#20041> for more information
help: if `Output` is an associated type you're trying to set, use the associated type binding syntax
|
LL | impl<B: Add> Add for E<B> where B: Add<Output = B> {
| ^^^^^^^^^^^^^^^^^
error[E0308]: mismatched types
--> $DIR/missing-bounds.rs:11:11
|
7 | impl<B> Add for A<B> where B: Add {
| - this type parameter
...
11 | A(self.0 + rhs.0)
| ^^^^^^^^^^^^^^ expected type parameter `B`, found associated type
|
= note: expected type parameter `B`
found associated type `<B as std::ops::Add>::Output`
help: consider further restricting this bound
|
7 | impl<B> Add for A<B> where B: Add + std::ops::Add<Output = B> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0369]: cannot add `B` to `B`
--> $DIR/missing-bounds.rs:31:21
|
31 | Self(self.0 + rhs.0)
| ------ ^ ----- B
| |
| B
|
help: consider restricting type parameter `B`
|
27 | impl<B: std::ops::Add<Output = B>> Add for D<B> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
```
That output is given for the following cases:
```rust
struct A<B>(B);
impl<B> Add for A<B> where B: Add {
type Output = Self;
fn add(self, rhs: Self) -> Self {
A(self.0 + rhs.0) //~ ERROR mismatched types
}
}
struct D<B>(B);
impl<B> Add for D<B> {
type Output = Self;
fn add(self, rhs: Self) -> Self {
Self(self.0 + rhs.0) //~ ERROR cannot add `B` to `B`
}
}
struct E<B>(B);
impl<B: Add> Add for E<B> where <B as Add>::Output = B {
type Output = Self;
fn add(self, rhs: Self) -> Self {
Self(self.0 + rhs.0)
}
}
```
`slice::fill`: use `T` instead of generic arg implements rust-lang#70758 (comment) As the discussion in rust-lang#70758 has shifted, I now use `T` instead of `&T`.
…chenkov Implement `confusable_idents` lint. This collects all identifier symbols into `ParseSession` and examines them within the non-ascii-idents lint. The skeleton generation part needs to be added to `unicode-security` crate. Will update this PR when the crate is updated. r? @petrochenkov EDIT: also included the `concat_idents` part.
Decode qualifs for associated const defaults Fixes rust-lang#71734. We encode qualifs for associated constants, but never expected to decode the qualifs for defaulted associated consts. Fix this, and test that associated const defaults have the correct qualifs cross-crate. r? @tmandry
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@bors r+ rollup=never p=5 |
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📌 Commit 18b456b has been approved by |
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Successful merges:
slice::fill: useTinstead of generic arg #71165 (slice::fill: useTinstead of generic arg)confusable_identslint. #71542 (Implementconfusable_identslint.)Failed merges:
r? @ghost