closes: rust-lang#98070

- require `TypeErrCtxt` to always result in an error
- move `resolve_regions_and_report_errors` to the `ObligationCtxt`
- merge `process_registered_region_obligations` into `resolve_regions`

It's what all the call sites require.

It's weird and unnecessary.

It is only implemented for `Region`, where it is equivalent to the
inherent `as_var` method.

I'm surprised the compiler doesn't warn about these. It appears having
an `impl` on a struct is enough to avoid a warning about it never being
constructed.

…14,albertlarsan68

Create "suggested tests" tool in `rustbuild`

Not the claimed person in rust-lang#97339 but:
I've done a very rough implementation of this feature in-tree. I'm very new to `rustc` development (outside of docs) so some help would be greatly appreciated. The UI of this new subcommand obviously will change and I need some mentoring with the `--run` flag.

r? `@jyn514`

…s, r=Amanieu

Add creation time support to `FileTimes` on apple and windows

Adds support for setting file creation times on platforms which support changing it directly (currently only Apple and Windows). Based on top of rust-lang#110093 (which was split from this PR).

ACP: rust-lang/libs-team#199 (currently still in progress)

Tracking issue: rust-lang#98245

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

…, r=Mark-Simulacrum

Stabilize IsTerminal

FCP completed in rust-lang#98070 .

closes: rust-lang#98070

…iemjay

Erase lifetimes above `ty::INNERMOST` when probing ambiguous types

Turns out that `TyCtxt::replace_escaping_bound_vars_uncached` only erases bound vars exactly at `ty::INNERMOST`, and not everything above. This regresses the suggestions for non-lifetime binders, but oh well, I don't really care about those.

Fixes rust-lang#110052

…iler-errors

Remove `ToRegionVid`

r? `@compiler-errors`

cleanup our region error API

- require `TypeErrCtxt` to always result in an error, closing rust-lang#108810
- move `resolve_regions_and_report_errors` to the `ObligationCtxt`
- call `process_registered_region_obligations` in `resolve_regions`
- move `resolve_regions` into the `outlives` submodule
- add `#[must_use]` to functions returning lists of errors

r? types