Add `struct FileTimes` to contain the relevant file timestamps, since
most platforms require setting all of them at once. (This also allows
for future platform-specific extensions such as setting creation time.)

Add `File::set_file_time` to set the timestamps for a `File`.

Implement the `sys` backends for UNIX, macOS (which needs to fall back
to `futimes` before macOS 10.13 because it lacks `futimens`), Windows,
and WASI.

…ctually querying it

Signed-off-by: Yuki Okushi <jtitor@2k36.org>

Arms are about TAIT and RPIT, as the variants clearly show.

…=jsha

Add macro support in jump to definition feature

Fixes rust-lang#91174.

To do so, I check if the span comes from an expansion, and if so, I infer the original macro `DefId` or `Span` depending if it's a defined in the current crate or not.

There is one limitation due to macro expansion though:

```rust
macro_rules! yolo { () => {}}

fn foo() {
    yolo!();
}
```

In `foo`, `yolo!` won't be linked because after expansion, it is replaced by nothing (which seems logical). So I can't get an item from the `Visitor` from which I could tell if its `Span` comes from an expansion.

I added a test for this specific limitation alongside others.

Demo: https://rustdoc.crud.net/imperio/macro-jump-to-def/src/foo/check-source-code-urls-to-def-std.rs.html

As for the empty macro issue that cannot create a jump to definition, you can see it [here](https://rustdoc.crud.net/imperio/macro-jump-to-def/src/foo/check-source-code-urls-to-def-std.rs.html#35).

r? ``@jyn514``

lub: don't bail out due to empty binders

allows for the following to compile. The equivalent code using `struct Wrapper<'upper>(fn(&'upper ());` already compiles on stable.
```rust
let _: fn(&'upper ()) = match v {
    true => lt_in_fn::<'a>(),
    false => lt_in_fn::<'b>(),
};
```
see https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=7034a677190110941223cafac6632f70 for a complete example

r? ``@rust-lang/types``

…impl-nll, r=cjgillot

Give name if anonymous region appears in impl signature

Fixes rust-lang#98170

We probably should remove the two unwraps in [`report_general_error`](https://doc.rust-lang.org/nightly/nightly-rustc/src/rustc_borrowck/diagnostics/region_errors.rs.html#683-685), but I have no idea what to provide if those regions are missing, so I've kept those in. Let me know if I should try harder to remove those.

Support setting file accessed/modified timestamps

Add `struct FileTimes` to contain the relevant file timestamps, since
most platforms require setting all of them at once. (This also allows
for future platform-specific extensions such as setting creation time.)

Add `File::set_file_time` to set the timestamps for a `File`.

Implement the `sys` backends for UNIX, macOS (which needs to fall back
to `futimes` before macOS 10.13 because it lacks `futimens`), Windows,
and WASI.

…rrors

Add a full regression test for rust-lang#73727

Closes rust-lang#73727

This also moves a test to the `issues` directory as it's also tested on the adt_const_params feature.

r? ``@compiler-errors``

Signed-off-by: Yuki Okushi <jtitor@2k36.org>

…t, r=oli-obk

This comment is out dated and misleading, the arm is about TAITs

r? ``@oli-obk``

``@oli-obk`` unsure if you want to add a different comment of some sort.

``@bors`` rollup=always