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Auto merge of #86213 - jhpratt:stabilize-const-from_utf8_unchecked, r=JohnTitor 

Stabilize `str::from_utf8_unchecked` as `const`

This stabilizes `unsafe fn str::from_utf8_unchecked` as `const` pending FCP on #75196. By the time FCP finishes, the beta will have already been cut, so I've set 1.55 as the stable-since version.

(should also be +relnotes but I don't have the permission to do that)

r? `@m-ou-se`

Closes #75196
This commit is contained in:
bors 2021-07-04 11:56:55 +00:00
parent 39e20f1ae5 fe7487a79e
commit 308fc2322b
1 changed files with 1 additions and 1 deletions
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2
library/core/src/str/converts.rs
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@ -156,7 +156,7 @@ pub fn from_utf8_mut(v: &mut [u8]) -> Result<&mut str, Utf8Error> {
/// ```
#[inline]
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_unstable(feature = "const_str_from_utf8_unchecked", issue = "75196")]
#[rustc_const_stable(feature = "const_str_from_utf8_unchecked", since = "1.55.0")]
#[rustc_allow_const_fn_unstable(const_fn_transmute)]
pub const unsafe fn from_utf8_unchecked(v: &[u8]) -> &str {
// SAFETY: the caller must guarantee that the bytes `v` are valid UTF-8.