This allows the bootstrap cache path to be set by the
`RUSTC_BOOTSTRAP_CACHE` environment variable.

Setting the bootstrap cache path to an external location can help to
speed up builds in cases where the build directory is not kept between
builds, e.g. in CI or other automated build systems.

Setting the bootstrap cache path to an external location can help to
speed up builds in cases where the build directory is not kept between
builds, e.g. in CI or other automated build systems.

… into queries

This makes it easier to see that the call to `in_scope` returns both the then
block and the else block. The rather confusing `unpack!` step is confined to
its own separate line.

(This patch reindents several lines, so using "ignore whitespace" is
recommended in order to focus on the actual changes.)

The `TraitPredicate` no longer has constness as we have desugared it to work with the type system through const generics instead.

Co-authored-by: Onur Özkan <onurozkan.dev@outlook.com>

…t, r=petrochenkov

Fix redundant import errors for preload extern crate

Fixes rust-lang#121915

Add an option to have an external download/bootstrap cache

Follow up from rust-lang#116697 to address rust-lang#116697 (review)

…chenkov

loongarch: add frecipe and relax target feature

This PR adds `frecipe` and `relax` target features to LoongArch:

* frecipe - Support frecipe.{s/d} and frsqrte.{s/d} instructions..
* relax - Enable Linker relaxation.

Do not try to format removed files

If you removed a file, `x fmt` would confusingly print
```
formatting modified file path/to/file.rs
```
and pass it to the formatting logic. Filter out files with `D` (removed) status

…astorino

Uplift some feeding out of `associated_type_for_impl_trait_in_impl` and into queries

This PR moves the `type_of` and `generics_of` query feeding out of `associated_type_for_impl_trait_in_impl`, since eagerly feeding results in query cycles due to a subtle interaction with `resolve_bound_vars`.

Fixes rust-lang#122019

r? spastorino

Make the lowering of `thir::ExprKind::If` easier to follow

This targets a few code patterns that I found very confusing when I first tried to understand what this code is doing.

No functional changes. I recommend looking at the changes individually, with whitespace hidden.

Add missing PartialOrd trait implementation doc for array

Analogously to vectors and slices, this PR documents the lexicographic sorting of PartialOrd as rustdoc comment on the trait implementation of PartialOrd for arrays.
Associated issue: rust-lang#122073.

…, r=compiler-errors

remove outdated fixme comment

The `TraitPredicate` no longer has constness as we have desugared it to work with the type system through const generics instead.

Note why we're using a new thread in `test_get_os_named_thread`

``@RalfJung`` expressed some "surprise and confusion" about why we're spawning a new thread in this test. Hopefully this comment will help future readers.