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Rollup merge of #82516 - PoignardAzur:inherent-impl-ty, r=oli-obk

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Add incomplete feature gate for inherent associate types.

Mentored by ``````@oli-obk``````

So far the only change is that instead of giving an automatic error, the following code compiles:

```rust
struct Foo;

impl Foo {
    type Bar = isize;
}
```

The backend work to make it actually usable isn't there yet. In particular, this:

```rust
let x : Foo::Bar;
```

will give you:

```sh
error[E0223]: ambiguous associated type
  --> /$RUSTC_DIR/src/test/ui/assoc-inherent.rs:15:13
   |
LL |     let x : Foo::Bar;
   |             ^^^^^^^^ help: use fully-qualified syntax: `<Foo as Trait>::Bar`
```
This commit is contained in:
Yuki Okushi 2021-03-02 21:23:15 +09:00 • committed by GitHub
commit 5e68c60406
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12 changed files with 89 additions and 45 deletions
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1
compiler/rustc_error_codes/src/error_codes.rs
View file

@ -103,7 +103,6 @@ E0198: include_str!("./error_codes/E0198.md"),
E0199: include_str!("./error_codes/E0199.md"),
E0200: include_str!("./error_codes/E0200.md"),
E0201: include_str!("./error_codes/E0201.md"),
E0202: include_str!("./error_codes/E0202.md"),
E0203: include_str!("./error_codes/E0203.md"),
E0204: include_str!("./error_codes/E0204.md"),
E0205: include_str!("./error_codes/E0205.md"),

15
compiler/rustc_error_codes/src/error_codes/E0202.md
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@ -1,15 +0,0 @@
Inherent associated types were part of [RFC 195] but are not yet implemented.
See [the tracking issue][iss8995] for the status of this implementation.
Erroneous code example:
```compile_fail,E0202
struct Foo;
impl Foo {
type Bar = isize; // error!
}
```
[RFC 195]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
[iss8995]: https://github.com/rust-lang/rust/issues/8995