Implement IndexMut for String and str.

[rust.git] / src / libcollections / str.rs

diff --git a/src/libcollections/str.rs b/src/libcollections/str.rs
index 7f86209bd2ac9c514f5def488724cb726fb163c7..711e2887865d9ccf882d08ccc80e6c2adee1e598 100644 (file)
--- a/src/libcollections/str.rs
+++ b/src/libcollections/str.rs
@@ -546,6 +546,14 @@ pub unsafe fn slice_unchecked(&self, begin: usize, end: usize) -> &str {
         core_str::StrExt::slice_unchecked(self, begin, end)
     }
 
+    /// Takes a bytewise mutable slice from a string.
+    ///
+    /// Same as `slice_unchecked`, but works with `&mut str` instead of `&str`.
+    #[stable(feature = "derefmut_for_string", since = "1.2.0")]
+    pub unsafe fn slice_mut_unchecked(&mut self, begin: usize, end: usize) -> &mut str {
+        core_str::StrExt::slice_mut_unchecked(self, begin, end)
+    }
+
     /// Returns a slice of the string from the character range [`begin`..`end`).
     ///
     /// That is, start at the `begin`-th code point of the string and continue