Most pages include the item type in the title such as "Struct
std::vec::Vec". However it is missing from the pages for foreign
functions, type definitions, macros, statics and constants. This adds them
so for example, instead of a title of "std::u32::MAX" it is "Constant
std::u32::MAX" to match the others.

Closes rust-lang#35668

…by `Q`.

Fix rust-lang#36278. Fix rust-lang#36294.

Instead of listing every field it will now show missing `a`, `z`, `b`, and 1 other field

…dturner

Update the wording for E0063. This will truncate the fields to 3.

Instead of listing every field it will now show missing `a`, `z`, `b`, and 1 other field
This is for rust-lang#35218 as part of rust-lang#35233

r? @jonathandturner

…bnik

rustdoc: Add missing item types to page titles

Most pages include the item type in the title such as "Struct std::vec::Vec". However it is missing from the pages for foreign functions, type definitions, macros, statics and constants. This adds them so for example, instead of a title of "std::u32::MAX" it is "Constant std::u32::MAX" to match the others.

[before](https://doc.rust-lang.org/nightly/std/u32/constant.MAX.html) [after](https://ollie27.github.io/rust_doc_test/std/u32/constant.MAX.html)
[before](https://doc.rust-lang.org/nightly/std/io/type.Result.html) [after](https://ollie27.github.io/rust_doc_test/std/io/type.Result.html)

Previous discussions: rust-lang#34345, rust-lang#35003

…=GuillaumeGomez

Add doc example for `std::time::Instant::elapsed`.

None

doc: we got coercion going on here, so no need to be this explicit

Fixed typo in nomicon

Handle `ReEmpty` for `impl Trait`

Closes rust-lang#35668

r? @eddyb

…hton

Use LLVM_COMPONENTS to run tests just for supported targets

This is already done for simd-ffi test, but not for atomic-lock-free test.

Fix rust-lang#35023.

…eddyb

When sizing DST, don't double-count nested struct prefixes.

When computing size of `struct P<T>(Q<T>)`, don't double-count prefix added by `Q`

Fix rust-lang#36278. Fix rust-lang#36294.

Allow setting --docdir

This will allow setting `--docdir` during configure, this is useful because not all linux distributions install documentation to `/usr/share/doc`.  For example in Slackware documentation is installed to `/usr/doc/$PRGNAM-$VERSION` and `/usr/share/doc` is a symlink to `/usr/doc`.

To use this `./configure --docdir=/usr/doc/$PRGNAM-$VERSION` can be used.