This leads to a lot of simplifications, as most code doesn't actually need to know about the specific lifetime/type data; rather, it's concerned with properties like name, index and def_id.

And with one final incanation, the specific kind iterators were banished from ty::Generics, never to be seen again!

Begone lazy lifetime code!

Remove vestigial diverging !-coercion

Such conversions are no longer permitted. Fixes #50350.

r? @nikomatsakis

Update stdsimd module

to include https://github.com/rust-lang-nursery/stdsimd/commit/a19ca1cd91cf97777af8268a6136bd2e4648e189

Rustdoc improvements

Fixes #50658. (last commit)

A lot of small improvements.

r? @QuietMisdreavus

Ensure derive(PartialOrd) is no longer accidentally exponential

Previously, two comparison operations would be generated for each field, each of which could delegate to another derived PartialOrd. Now we use ordering and optional chaining to ensure each pair of fields is only compared once, addressing https://github.com/rust-lang/rust/issues/49650#issuecomment-379467572.

Closes #49505.

r? @Manishearth (sorry for changing it again so soon!)

Close #50755

Update clippy

r? @Manishearth

@bors p=1

typeck: Save the index of private fields

Save the index of all fields regardless of their visibility. Problems
could occur later when attempting to index fields in error recovery if
they are not inserted.

Fixes: #50493

rustc: don't trip an assertion for enums with present but uninhabited variants.

Fixes #50731.

r? @nikomatsakis

Update stdsimd module to include https://github.com/rust-lang-nursery/stdsimd/commit/a19ca1cd91cf97777af8268a6136bd2e4648e189

stabilize macro_lifetime_matcher

This stabilizes `:lifetime` which has completed FCP in #34303.