rustc: Add some more checks to the stability lint #18679
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This commit adds support for linting `extern crate` statements for stability attributes attached to the crate itself. This is likely to be the mechanism used to deny access to experimental crates that are part of the standard distribution. cc rust-lang#18585
This catches uses of unstable traits in
```
trait Foo: UnstableTrait { }
```
and
```
impl UnstableTrait for Foo { }
```
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This catches uses of unstable traits in
and
Builds on an @alexcrichton PR.
r? @aturon