This is a modified version of the test I added previously. The difference is this version implements a wrapper around std::any::type_name versus core::intrinsics::type_name, in order to show that it works as desired / intended.

Specifically the `#[rustc_const_unstable(feature = "const_type_name")]` attribute, as well as marking the actual function as `const`.

Unsupport the `await!(future)` macro

Unsupport the `await!(future)` "macro" and recognize it in error recovery instead.

The `future.await` syntax has been on nightly since 2019-05-08.
This was 55 days ago which is 1.31 releases ago.

Closes rust-lang#60610.

r? @cramertj

…GuillaumeGomez

Add doc links to liballoc crate page

…=varkor

Turn `INCOMPLETE_FEATURES` into lint

We do this because it is annoying to see the warning when building rustc and because this is better from a "separation of concerns" POV.

The drawback to this change is that this will respect `--cap-lints`.
Also note that this is not a buffered lint so if there are fatal parser errors then the lint will not trigger.

r? @varkor

Use global variable 'environ' to pass environments to rtpSpawn

r? @alexcrichton

…, r=oli-obk

`const fn`-ify `std::any::type_name` as laid out in rust-lang#63084

A test, based on the one I added when I implemented support for the underlying `core::intrinsics::type_name` being allowed in `const fn` contexts, is included.

…-obk

Subslice patterns: Test passing static & dynamic semantics.

Working towards testing coverage for rust-lang#62254.
See https://github.com/rust-lang/rfcs/blob/master/text/2359-subslice-pattern-syntax.md for the RFC.

r? @oli-obk cc @petrochenkov

…r=Mark-Simulacrum

Updated RELEASES.md for 1.37.0

Squashed rust-lang#62653.