std: Stabilize the `str_{mut,box}_extras` feature

Stabilizes

* `<&mut str>::as_bytes_mut`
* `<Box<str>>::into_boxed_bytes`
* `std::str::from_boxed_utf8_unchecked`
* `std::str::from_utf8_mut`
* `std::str::from_utf8_unchecked_mut`

Closes #41119

1 files changed, 3 insertions, 3 deletions

diff --git a/src/libcore/str/mod.rs b/src/libcore/str/mod.rs
index 78d2a526e02..4c99fe97daf 100644
--- a/src/libcore/str/mod.rs
+++ b/src/libcore/str/mod.rs
@@ -301,7 +301,7 @@ pub fn from_utf8(v: &[u8]) -> Result<&str, Utf8Error> {
 }
 
 /// Converts a mutable slice of bytes to a mutable string slice.
-#[unstable(feature = "str_mut_extras", issue = "41119")]
+#[stable(feature = "str_mut_extras", since = "1.20.0")]
 pub fn from_utf8_mut(v: &mut [u8]) -> Result<&mut str, Utf8Error> {
     run_utf8_validation(v)?;
     Ok(unsafe { from_utf8_unchecked_mut(v) })
@@ -382,7 +382,7 @@ pub unsafe fn from_utf8_unchecked(v: &[u8]) -> &str {
 ///
 /// [fromutf8]: fn.from_utf8_unchecked.html
 #[inline]
-#[unstable(feature = "str_mut_extras", issue = "41119")]
+#[stable(feature = "str_mut_extras", since = "1.20.0")]
 pub unsafe fn from_utf8_unchecked_mut(v: &mut [u8]) -> &mut str {
     mem::transmute(v)
 }
@@ -2123,7 +2123,7 @@ pub trait StrExt {
     fn is_char_boundary(&self, index: usize) -> bool;
     #[stable(feature = "core", since = "1.6.0")]
     fn as_bytes(&self) -> &[u8];
-    #[unstable(feature = "str_mut_extras", issue = "41119")]
+    #[stable(feature = "str_mut_extras", since = "1.20.0")]
     unsafe fn as_bytes_mut(&mut self) -> &mut [u8];
     #[stable(feature = "core", since = "1.6.0")]
     fn find<'a, P: Pattern<'a>>(&'a self, pat: P) -> Option<usize>;