Matthias Krüger 0392e2996e

Rollup merge of #108954 - notriddle:notriddle/notable-trait-generic, r=camelid ...

rustdoc: handle generics better when matching notable traits

This commit makes the `clean::Type::is_same` non-commutative (renaming it `is_doc_subtype_of`), so that a generic `impl` matches a concrete return, but a generic return does not match a concrete `impl`. It makes slice and vector Write for `u8` not match on every generic return value.

Fixes #100322

Fixes #55082

Preview:

* https://notriddle.com/rustdoc-demo-html-3/notable-trait-generic/std/vec/struct.Vec.html#method.new
* https://notriddle.com/rustdoc-demo-html-3/notable-trait-generic/std/vec/struct.Vec.html#method.from-12
* https://notriddle.com/rustdoc-demo-html-3/notable-trait-generic/std/iter/trait.Iterator.html#method.intersperse_with
* https://notriddle.com/rustdoc-demo-html-3/notable-trait-generic/std/string/struct.String.html#method.as_bytes

2023-03-22 22:44:39 +01:00

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