Add tracking issue for `String::insert_str`

diff --git a/src/libcollections/string.rs b/src/libcollections/string.rs
index 70b514afd035f1d17d446c0dbbee6f158b1eb950..c06bde6222ac8410fe9ad6ebdd0c4464da9c2059 100644 (file)
--- a/src/libcollections/string.rs
+++ b/src/libcollections/string.rs
@@ -1180,7 +1180,7 @@ unsafe fn insert_bytes(&mut self, idx: usize, bytes: &[u8]) {
     #[inline]
     #[unstable(feature = "insert_str",
                reason = "recent addition",
-               issue = "0")]
+               issue = "35553")]
     pub fn insert_str(&mut self, idx: usize, string: &str) {
         let len = self.len();
         assert!(idx <= len);