RustHermit and HermitCore is able to run on aarch64 and x86_64.
In the future these operating systems will also support RISC-V.
Consequently, the dependency to a specific target should be removed.
Building hermit-abi fails if the architecture isn't supported.

No functional changes intended.

This updates the test case to use llvm-nm instead of the system nm.
This fixes an instance over at the experimental build of rustc with HEAD LLVM:
https://buildkite.com/llvm-project/rust-llvm-integrate-prototype/builds/8380#ef6f41b5-8595-49a6-be37-0eff80e0ccb5
It is related to rust-lang#94001.

The issue is that this test uses the system nm, which may not be recent
enough to understand the update to uwtable. This replaces the test to
use the llvm-nm that should be recent enough (consistent with the LLVM
sources we use to build rustc).

Co-authored-by: Jubilee Young <workingjubilee@gmail.com>

The optimization was proposed by @falk-hueffner in https://rust-lang.zulipchat.com/#narrow/stream/219381-t-libs/topic/Micro-optimizing.20char.3A.3Afrom_u32/near/272146171,  and I simplified it a bit and added an explanation of why the optimization is correct.

92d20c4 removed no-variants special
case from try_destructure_const with expectation that this case would be
handled gracefully when read_discriminant returns an error.

Alas in that case read_discriminant succeeds while returning a
non-existing variant, so the special case is still necessary.

…=scottmcm

Stabilize pin_static_ref.

FCP finished here: rust-lang#78186 (comment)

Closes rust-lang#78186

…mulacrum

Release notes for 1.59

cc `@rust-lang/release`
r? `@cuviper`

…iplett

core: Implement ASCII trim functions on byte slices

Hi ````````@rust-lang/libs!```````` This is a feature that I wished for when implementing serial protocols with microcontrollers. Often these protocols may contain leading or trailing whitespace, which needs to be removed. Because oftentimes drivers will operate on the byte level, decoding to unicode and checking for unicode whitespace is unnecessary overhead.

This PR adds three new methods to byte slices:

- `trim_ascii_start`
- `trim_ascii_end`
- `trim_ascii`

I did not find any pre-existing discussions about this, which surprises me a bit. Maybe I'm missing something, and this functionality is already possible through other means? There's rust-lang/rfcs#2547 ("Trim methods on slices"), but that has a different purpose.

As per the [std dev guide](https://std-dev-guide.rust-lang.org/feature-lifecycle/new-unstable-features.html), this is a proposed implementation without any issue / RFC. If this is the wrong process, please let me know. However, I thought discussing code is easier than discussing a mere idea, and hacking on the stdlib was fun.

Tracking issue: rust-lang#94035

…acro, r=notriddle

rustdoc: Avoid duplicating macros in sidebar

Fixes rust-lang#93912.

cc ``````@jsha`````` (for the GUI test)
r? ``````@camelid``````

removing architecture requirements for RustyHermit

RustHermit and HermitCore is able to run on aarch64 and x86_64. In the future these operating systems will also support RISC-V. Consequently, the dependency to a specific target should be removed.

The build process of `hermit-abi` fails if the architecture isn't supported.

…=Mark-Simulacrum

adapt static-nobundle test to use llvm-nm

No functional changes intended.

This updates the test case to use llvm-nm instead of the system nm.
This fixes an instance over at the experimental build of rustc with HEAD LLVM:
https://buildkite.com/llvm-project/rust-llvm-integrate-prototype/builds/8380#ef6f41b5-8595-49a6-be37-0eff80e0ccb5
It is related to rust-lang#94001.

The issue is that this test uses the system nm, which may not be recent
enough to understand the update to uwtable. This replaces the test to
use the llvm-nm that should be recent enough (consistent with the LLVM
sources we use to build rustc).

…ed-value, r=oli-obk

Fix rustdoc const computed value

Fixes rust-lang#85088.

It looks like this now (instead of hexadecimal):

![Screenshot from 2022-02-17 17-55-39](https://user-images.githubusercontent.com/3050060/154532115-0f9861a0-406f-4c9c-957f-32bedd8aca7d.png)

r? ````@oli-obk````

Fix pretty printing of enums without variants

92d20c4 removed no-variants special case from `try_destructure_const` with expectation that this case would be handled gracefully when `read_discriminant` returns an error.

Alas in that case `read_discriminant` succeeds while returning a non-existing variant, so the special case is still necessary.

Fixes rust-lang#94073.

r? ````@oli-obk````

…cjgillot

Add module-level docs for `rustc_middle::query`

Optimize char_try_from_u32

The optimization was proposed by ```````@falk-hueffner``````` in https://rust-lang.zulipchat.com/#narrow/stream/219381-t-libs/topic/Micro-optimizing.20char.3A.3Afrom_u32/near/272146171,  and I simplified it a bit and added an explanation of why the optimization is correct. The generated code is 2 instructions shorter and uses 2 registers instead of 4 on x86.

document rustc_middle::mir::Field

cc rust-lang#94025

…otriddle

Fix miniz_oxide types showing up in std docs

Fixes rust-lang#90526.

Thanks to ```````@camelid,``````` I rediscovered `doc(masked)`, allowing us to prevent `miniz_oxide` type to show up in std docs.

r? ```````@notriddle```````

rustc_typeck: adopt let else in more places

Continuation of rust-lang#89933, rust-lang#91018, rust-lang#91481, rust-lang#93046, rust-lang#93590, rust-lang#94011.

I have extended my clippy lint to also recognize tuple passing and match statements. The diff caused by fixing it is way above 1 thousand lines. Thus, I split it up into multiple pull requests to make reviewing easier. This PR handles rustc_typeck.

Adopt let else in more places

Continuation of rust-lang#89933, rust-lang#91018, rust-lang#91481, rust-lang#93046, rust-lang#93590, rust-lang#94011.

I have extended my clippy lint to also recognize tuple passing and match statements. The diff caused by fixing it is way above 1 thousand lines. Thus, I split it up into multiple pull requests to make reviewing easier. This is the biggest of these PRs and handles the changes outside of rustdoc, rustc_typeck, rustc_const_eval, rustc_trait_selection, which were handled in PRs rust-lang#94139, rust-lang#94142, rust-lang#94143, rust-lang#94144.