old:
    ascii::bench_ascii_escape_display_mixed      17.97µs/iter +/- 204.00ns
    ascii::bench_ascii_escape_display_no_escape 545.00ns/iter   +/- 6.00ns
new:
    ascii::bench_ascii_escape_display_mixed      4.99µs/iter +/- 56.00ns
    ascii::bench_ascii_escape_display_no_escape 91.00ns/iter  +/- 1.00ns

…tc_infer using callback.

Pass each obligation to an fn callback with its respective inference context. This avoids needing to keep around copies of obligations or inference contexts.

Specify usability of inspect_typeck in comment.

…ecked

Fix rust-lang#119633.

Fix rust-lang#119652.

Fix rust-lang#119652.

…lacrum,dtolnay

Added NonZeroXxx::from_mut(_unchecked)?

ACP: rust-lang/libs-team#129
Tracking issue: rust-lang#106290

…imulacrum

optimize EscapeAscii's Display  and CStr's Debug

```
old:
    ascii::bench_ascii_escape_display_mixed      17.97µs/iter +/- 204.00ns
    ascii::bench_ascii_escape_display_no_escape 545.00ns/iter   +/- 6.00ns
new:
    ascii::bench_ascii_escape_display_mixed      4.99µs/iter +/- 56.00ns
    ascii::bench_ascii_escape_display_no_escape 91.00ns/iter  +/- 1.00ns
```

…wesleywiser

Stabilize single-field offset_of

This PR stabilizes offset_of for a single field. There has been some further discussion at rust-lang#106655 about whether this is advisable; I'm opening the PR anyway so that the code is available.

Expose Obligations created during type inference.

This PR is a first pass at exposing the trait obligations generated and solved for during the type-check progress. Exposing these obligations allows for rustc plugins to use the public interface for proof trees (provided by the next gen trait solver).

The changes proposed track *all* obligations during the type-check process, this is desirable to not only look at the trees of failed obligations, but also those of successfully proved obligations. This feature is placed behind an unstable compiler option `track-trait-obligations` which should be used together with the `next-solver` option. I should note that the main interface is the function `inspect_typeck` made public in `rustc_hir_typeck/src/lib.rs` which allows the caller to provide a callback granting access to the `FnCtxt`.

r? `@lcnr`

Avoid ICEs in trait names without `dyn`

Check diagnostic is error before downgrading. Fix rust-lang#119633.

 Account for traits using self-trait by name without `dyn`. Fix rust-lang#119652.

…acrum

Teach tidy about line/col information for malformed features

This makes it significantly easier to find the specific feature, since you can now just click it in the command line of your IDE

SMIR: Make the remaining "private" fields actually private

Turns out we have already created a trait that allows us to make the fields private: https://doc.rust-lang.org/nightly/nightly-rustc/stable_mir/ty/trait.IndexedVal.html

fixes rust-lang/project-stable-mir#56

r? `@celinval`

`single_use_lifetimes`: Don't suggest deleting lifetimes with bounds

Closes rust-lang#117965

```
9 |     pub fn get<'b: 'a>(&'b self) -> &'a str {
  |                ^^       -- ...is used only here
  |                |
  |                this lifetime...
```

In this example, I think the `&'b self` can be replaced with the bound itself, yielding `&'a self`, but this would require a deeper refactor. Happy to do as a follow-on PR if desired.

…es-even, r=cuviper

Stabilize `round_ties_even`

Closes  rust-lang#96710

`@rustbot` label -T-libs T-libs-api

…moting, r=aliemjay

Don't use `ReErased` to detect type test promotion failed

Using `ReErased` here is convenient because it implicitly stores the state that we are explicitly recording with the `failed` variable now, but I also think it adds a tiny bit of complexity that is not worth it.

r? `@aliemjay`