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The previous commit updated `rustfmt.toml` appropriately. This commit is
the outcome of running `x fmt --all` with the new formatting options.
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They're only used for HTML, so it makes more sense for them to live
their.
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Hack: many traits and types in std are re-exported from core or alloc. In
general, rustdoc is capable of recognizing these implementations as being
on local types. However, in at least one case, rustdoc gets confused and
labels an implementation as being on a foreign type. To make sure that
confusion doesn't pass on to the reader, consider all implementations in
std, core, and alloc to be on local types.
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rustdoc: Improve calculation of "Impls on Foreign Types"
The existing code to calculate whether an implementation was on a "Foreign Type" was duplicated across the sidebar generation and the page generation. It also came to the wrong conclusion for some cases where both the trait and the "for" type were re-exports.
This PR extracts the logic into a method of `Impl`, breaks it into a multi-line method so it can be commented, and adds a case for when the trait and the "for" type came from the same crate. This fixes some cases - like the platform-specific integer types (`__m256`, `__m128`, etc). But it doesn't fix all cases. See the screenshots below.
[Before](https://doc.rust-lang.org/nightly/std/clone/trait.Clone.html#foreign-impls):
<img src="https://user-images.githubusercontent.com/220205/171338226-59ce6daf-3d76-4bad-bc8d-72a8259a8f43.png" width=200>
[After](https://rustdoc.crud.net/jsha/implementation-is-on-local-type/std/clone/trait.Clone.html):
<img src="https://user-images.githubusercontent.com/220205/171338147-28308a65-1597-4223-be47-9550062404dd.png" width=200>
The remaining types (`CString`, `NulError`, etc) are all from the `alloc` crate, while the `Clone` trait is from the `core` crate. Since `CString` and `Clone` are both re-exported by `std`, they are logically local to each other, but I couldn't figure out a good way to detect that in this code. I figure this is still a good step forward.
Related: #97610
r? `@camelid`
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It should only ever be a `ResolvedPath`, so this (a) enforces that, and
(b) reduces the size of `Impl`.
I had to update a test because the order of the rendered auto trait impl
bounds changed. I think the order changed because rustdoc sorts auto
trait bounds using their `Debug` output.
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This brings the size of `Item` from
```
[src/librustdoc/lib.rs:103] std::mem::size_of::<Item>() = 680
```
to
```
[src/librustdoc/lib.rs:103] std::mem::size_of::<Item>() = 280
```
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This gives warnings about dead code.
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