Extend support of _ in type parameters
#68071
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- Account for `impl Trait<_>`.
- Provide a reasonable `Span` for empty `Generics` in `impl`s.
- Account for `fn foo<_>(_: _) {}` to suggest `fn foo<T>(_: T) {}`.
- Fix rust-lang#67995.
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r=me with ^-- addressed + comments in private |
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Extend support of `_` in type parameters
- Account for `impl Trait<_>`.
- Provide a reasonable `Span` for empty `Generics` in `impl`s.
- Account for `fn foo<_>(_: _) {}` to suggest `fn foo<T>(_: T) {}`.
- Fix rust-lang#67995. Follow up to rust-lang#67597.
Centril
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Extend support of `_` in type parameters
- Account for `impl Trait<_>`.
- Provide a reasonable `Span` for empty `Generics` in `impl`s.
- Account for `fn foo<_>(_: _) {}` to suggest `fn foo<T>(_: T) {}`.
- Fix rust-lang#67995. Follow up to rust-lang#67597.
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Rollup of 6 pull requests Successful merges: - #66463 (Point at opaque and closure type definitions in type errors) - #67501 (Reduce special treatment for zsts) - #67820 (Parse the syntax described in RFC 2632) - #67922 (rustc_ast_lowering: misc cleanup & rustc dep reductions) - #68071 (Extend support of `_` in type parameters) - #68073 (expect `fn` after `const unsafe` / `const extern`) Failed merges: r? @ghost
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Account for bounds and asociated items when denying `_` Fix rust-lang#68801, rust-lang#69204. Follow up to rust-lang#67597 and rust-lang#68071. Output for the original ICE report: ``` Checking vinoteca v5.0.0 (/Users/ekuber/workspace/vinoteca) error[E0121]: the type placeholder `_` is not allowed within types on item signatures --> src/producers.rs:43:70 | 43 | pub fn top<Table: diesel::Table + diesel::query_dsl::InternalJoinDsl<_, diesel::query_source::joins::Inner, _>>(table: Table, limit: usize, connection: DbConn) -> RestResult<Vec<TopWineType>> { | ^ not allowed in type signatures ^ not allowed in type signatures error: aborting due to previous error ```
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Account for bounds and asociated items when denying `_` Fix #68801, #69204. Follow up to #67597 and #68071. Output for the original ICE report: ``` Checking vinoteca v5.0.0 (/Users/ekuber/workspace/vinoteca) error[E0121]: the type placeholder `_` is not allowed within types on item signatures --> src/producers.rs:43:70 | 43 | pub fn top<Table: diesel::Table + diesel::query_dsl::InternalJoinDsl<_, diesel::query_source::joins::Inner, _>>(table: Table, limit: usize, connection: DbConn) -> RestResult<Vec<TopWineType>> { | ^ not allowed in type signatures ^ not allowed in type signatures error: aborting due to previous error ```
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impl Trait<_>.Spanfor emptyGenericsinimpls.fn foo<_>(_: _) {}to suggestfn foo<T>(_: T) {}._in item signatures #67597.