Rollup of 12 pull requests
Successful merges:
- #59928 (Make deprecation lint `ambiguous_associated_items` deny-by-default)
- #60220 (report fatal errors during doctest parsing)
- #60373 (Tidy: ensure lang features are sorted by since)
- #60388 (Disallow non-explicit elided lifetimes in async fn)
- #60393 ( Do not suggest incorrect syntax on pattern type error due to borrow)
- #60401 (Rename `RUST_LOG` to `RUSTC_LOG`)
- #60409 (Require a trait in the bounds of existential types)
- #60455 (Resolve match arm ty when arms diverge)
- #60457 (Const prop refactoring)
- #60467 (Avoid repeated interning of static strings.)
- #60478 (minor compiler doc tweaks)
- #60501 (Propagate mutability from arguments to local bindings in async fn)
Failed merges:
r? @ghost
Avoid repeated interning of static strings.
`file_metadata_raw` interns the strings `"<unknown>"` and `""` very
frequently. This commit avoids that, which reduces the number of symbols
interned significantly and reduces instruction counts by up to 0.5% on
some workloads.
Const prop refactoring
This is rebased on top of #60428 so only the top commit is new.
This is the refactoring to remove the `mir` field from `ConstPropagator` which is necessary before we can begin to actually propagate constants.
r? @oli-obk
Make `std::fs::copy` attempt to create copy-on-write clones of files on MacOS
The behaviour of MacOS now matches Linux which uses `copy_file_range` to perform CoW file copies where available and supported by the underlying filesystem.
`find_attr_val(&line, "since")` returns `Some(", issue = ")` when
`line` is set to the following line:
```
[unstable(feature = "checked_duration_since", issue = "58402")]
```
Make `find_attr_val` use regex that is a little bit more
precise (requires `=` after key name).
It still does not handle all cases (e.g., extra leading chars in key
name, or escaped quotes in value), but is good enough for now.
Currently, we deal with escape sequences twice: once when we lex a
string, and a second time when we unescape literals. This PR aims to
remove this duplication, by introducing a new `unescape` mode as a
single source of truth for character escaping rules
`file_metadata_raw` interns the strings `"<unknown>"` and `""` very
frequently. This commit avoids that, which reduces the number of symbols
interned significantly and reduces instruction counts by up to 0.5% on
some workloads.
