Rollup of 6 pull requests
Successful merges:
- #51143 (Specify that packed types must derive, not implement, Copy)
- #51226 (Make Layout's align a NonZeroUsize)
- #51297 (Fix run button style)
- #51306 (impl Default for &mut str)
- #51312 (Clarify the difference between get_mut and into_mut for OccupiedEntry)
- #51313 (use type name in E0599 enum variant suggestion)
Failed merges:
Clarify the difference between get_mut and into_mut for OccupiedEntry
The examples for both hash_map::OccupiedEntry::get_mut and
hash_map::OccupiedEntry::into_mut were almost identical. This led to some
confusion over the difference, namely why you would ever use get_mut when
into_mut gives alonger lifetime. Reddit thread:
https://www.reddit.com/r/rust/comments/8a5swr/why_does_hashmaps
This commit adds two lines and a comment to the example, to show that the
entry object can be re-used after calling get_mut.
Closes https://github.com/rust-lang/rust/issues/49745
Make Layout's align a NonZeroUsize
This PR makes the `Layout`'s align field a `NonZeroUsize` since it cannot ever be zero, not even while building a `Layout`. It also contains some drive-by minor cleanups over the docs and the code, like updating the documented error types, or using the `size()` and `align()` methods instead of accessing the fields directly (the latter was required for the `NonZeroUsize` change anyways).
r? @SimonSapin
cc @Amanieu
The examples for both hash_map::OccupiedEntry::get_mut and
hash_map::OccupiedEntry::into_mut were almost identical. This led
to some confusion over the difference, namely why you would ever
use get_mut when into_mut gives alonger lifetime. Reddit thread:
https://www.reddit.com/r/rust/comments/8a5swr/why_does_hashmaps
This commit adds two lines and a comment to the example, to show
that the entry object can be re-used after calling get_mut.
Fix typos of ‘ambiguous’
I had trouble finding this code because of the typo after it was [referenced in a tweet](https://twitter.com/bstrie/status/1002751044605153280). Also fixes an identical but unrelated typo in a comment.
Add as_nanos function to Duration
Duration has historically lacked a way to get the actual number of nanoseconds it contained as a normal Rust type because u64 was of insufficient range, and f64 of insufficient precision. The u128 type solves both issues, so I propose adding an `as_nanos` function to expose the capability.
Fix building rustc on and for musl hosts.
This fixes all problems I had when trying to compile rustc on a musl-based distribution (with `crt-static = false` in `config.toml`).
This is a fixed version of what ended up being #50105, making it possible to compile rustc on musl targets.
The differences to the old (now merged and subsequently reverted) pull request are:
- The commit (6d9154a830) that caused the regression for which the original commits were reverted in #50709 is left out. This means the corresponding bug #36710 is still not fixed with `+crt-static`.
- The test for issue 36710 is skipped for musl targets (until the issue is properly fixed).
- Building cargo-vendor if `crt-static = false` is needed was broken (cargo-vendor links to some shared libraries if they exist on the system and this produces broken binaries with `+crt-static`)
CC @alexcrichton
