许杰友 Jieyou Xu (Joe)
7ad1a3b8d8
implement inherent str constructors implement #131114 this implements - str::from_utf8 - str::from_utf8_mut - str::from_utf8_unchecked - str::from_utf8_unchecked_mut i left `std::str::from_raw_parts` and `std::str::from_raw_parts_mut` out of this as those are unstable and were not mentioned by the tracking issue or the original pull request, but i can add those here as well. i was also unsure of what to do with the `rustc_const_(un)stable` attributes: i removed the `#[rustc_const_stable]` attribute from `str::from_utf8`, `str::from_utf8_unchecked` and `str::from_utf8_unchecked_mut`, and left the`#[rust_const_unstable]` in `str::from_utf8_mut` (btw why is that one not const stable yet with #57349 merged?). is there a way to redirect users to the stable `std::str::from_utf8` instead of only saying "hey this is unstable"? for now i just removed the check for `str::from_utf8` in the test in `tests/ui/suggestions/suggest-std-when-using-type.rs`.
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