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Extend support of _ in type parameters #68071

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Jan 10, 2020
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@estebank estebank commented Jan 9, 2020

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r? @matthewjasper

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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jan 9, 2020
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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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estebank commented Jan 9, 2020

r? @Centril

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Centril commented Jan 9, 2020

r=me with ^-- addressed + comments in private

@Centril Centril added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jan 9, 2020
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estebank commented Jan 9, 2020

@bors r=Centril

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bors commented Jan 9, 2020

📌 Commit 6e04cf0 has been approved by Centril

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jan 9, 2020
Centril added a commit to Centril/rust that referenced this pull request Jan 10, 2020
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 added a commit to Centril/rust that referenced this pull request Jan 10, 2020
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.
bors added a commit that referenced this pull request Jan 10, 2020
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
@bors bors merged commit 6e04cf0 into rust-lang:master Jan 10, 2020
Dylan-DPC-zz pushed a commit to Dylan-DPC-zz/rust that referenced this pull request Feb 28, 2020
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
```
bors added a commit that referenced this pull request Feb 28, 2020
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
```
@estebank estebank deleted the ice-67995 branch November 9, 2023 05:17
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ICE: Returning impl Trait with placeholder type parameter
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