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Rollup of 5 pull requests #71826
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
@bors r+ rollup=never p=5 |
📌 Commit 18b456b has been approved by |
The job Click to expand the log.
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Successful merges:
slice::fill
: useT
instead of generic arg #71165 (slice::fill
: useT
instead of generic arg)confusable_idents
lint. #71542 (Implementconfusable_idents
lint.)Failed merges:
r? @ghost