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make `OsString::new` and `PathBuf::new` unstably const
Since #129041, `String::into_bytes` is `const`, which allows making `OsString::new` and `PathBuf::new` unstably const now.
Not sure what the exact process for this is; does it need an ACP?
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Clarify WTF-8 safety docs
This PR is a follow-up to PR #140159, which clarifies ~~two things~~:
- the WTF-8 safety comment [was confusing](https://github.com/rust-lang/rust/pull/140159#discussion_r2082766965), either surrogate condition is actually sufficient for safety, both are not required
- ~~the private `os_str::Slice` type name is easily confused with `std::slice`~~
~~Happy to bikeshed the `OsSlice` name, other alternatives are `OsStrSlice` and `StrSlice`. Now it's got a distinct name from `std::slice`, it's easy to search and replace.~~
cc ``@thaliaarchi`` ``@workingjubilee``
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Communicate the safety invariants of these methods with `unsafe fn`
rather than privacy.
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The WTF-8 version of `OsString` tracks whether it is known to be valid
UTF-8 with its `is_known_utf8` field. Specialize `From<AsRef<OsStr>>` so
this can be set for UTF-8 string types.
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When concatenating two WTF-8 strings, surrogate pairs at the boundaries
need to be joined. However, since UTF-8 strings cannot contain surrogate
halves, this check can be skipped when one string is UTF-8. Specialize
`OsString::push` to use a more efficient concatenation in this case.
Unfortunately, a specialization for `T: AsRef<str>` conflicts with
`T: AsRef<OsStr>`, so stamp out string types with a macro.
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Signed-off-by: crystalstall <crystalruby@qq.com>
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Since the stabilization in #127679 has reached stage0, 1.82-beta, we can
start using `&raw` freely, and even the soft-deprecated `ptr::addr_of!`
and `ptr::addr_of_mut!` can stop allowing the unstable feature.
I intentionally did not change any documentation or tests, but the rest
of those macro uses are all now using `&raw const` or `&raw mut` in the
standard library.
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The previous commit updated `rustfmt.toml` appropriately. This commit is
the outcome of running `x fmt --all` with the new formatting options.
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Now that #90435 seems to have been resolved.
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#126333
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Document overrides of `clone_from()` in core/std
As mentioned in https://github.com/rust-lang/rust/pull/96979#discussion_r1379502413
Specifically, when an override doesn't just forward to an inner type, document the behavior and that it's preferred over simply assigning a clone of source. Also, change instances where the second parameter is "other" to "source".
I reused some of the wording over and over for similar impls, but I'm not sure that the wording is actually *good*. Would appreciate feedback about that.
Also, now some of these seem to provide pretty specific guarantees about behavior (e.g. will reuse the exact same allocation iff the len is the same), but I was basing it off of the docs for [`Box::clone_from`](https://doc.rust-lang.org/1.75.0/std/boxed/struct.Box.html#method.clone_from-1) - I'm not sure if providing those strong guarantees is actually good or not.
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Specifically, when an override doesn't just forward to an inner type,
document the behavior and that it's preferred over simply assigning
a clone of source. Also, change instances where the second parameter is
"other" to "source".
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Add `display` method to `OsStr`
Add `display` method to `OsStr` for lossy display of an `OsStr` which may contain invalid unicode.
Invalid Unicode sequences are replaced with `U+FFFD REPLACEMENT CHARACTER`.
This change also makes the `std::ffi::os_str` module public (see https://github.com/rust-lang/libs-team/issues/326#issuecomment-1894160023).
- ACP: https://github.com/rust-lang/libs-team/issues/326
- Tracking issue: #120048
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Help with common API confusion, like asking for `push` when the data structure really has `append`.
```
error[E0599]: no method named `size` found for struct `Vec<{integer}>` in the current scope
--> $DIR/rustc_confusables_std_cases.rs:17:7
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LL | x.size();
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help: you might have meant to use `len`
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LL | x.len();
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help: there is a method with a similar name
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LL | x.resize();
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```
#59450
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On Windows and UEFI this improves performance and error messaging.
On other platforms we optimize the fast path a bit more.
This also prepares for later relaxing the checks on certain platforms.
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Add `display` method to `OsStr` for lossy display of an `OsStr` which may contain invalid unicode.
Invalid Unicode sequences are replaced with `U+FFFD REPLACEMENT CHARACTER`.
This change also makes the `std::ffi::os_str` module public.
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Closes #111544
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Allow limited access to `OsString` bytes
This extends #109698 to allow no-cost conversion between `Vec<u8>` and `OsString` as suggested in feedback from `os_str_bytes` crate in #111544.
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This extends #109698 to allow no-cost conversion between `Vec<u8>` and `OsString`
as suggested in feedback from `os_str_bytes` crate in #111544.
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