[breaking-change] std: change `encode_utf{8,16}()` to take a buffer and return a slice

They panic if the buffer is too small.

1 files changed, 4 insertions, 3 deletions

diff --git a/src/libcollections/string.rs b/src/libcollections/string.rs
index cff0308d4af..e4930ae3572 100644
--- a/src/libcollections/string.rs
+++ b/src/libcollections/string.rs
@@ -975,7 +975,7 @@ impl String {
     pub fn push(&mut self, ch: char) {
         match ch.len_utf8() {
             1 => self.vec.push(ch as u8),
-            _ => self.vec.extend_from_slice(ch.encode_utf8().as_slice()),
+            _ => self.vec.extend_from_slice(ch.encode_utf8(&mut [0;4]).as_bytes()),
         }
     }
 
@@ -1131,10 +1131,11 @@ impl String {
         let len = self.len();
         assert!(idx <= len);
         assert!(self.is_char_boundary(idx));
-        let bits = ch.encode_utf8();
+        let mut bits = [0; 4];
+        let bits = ch.encode_utf8(&mut bits).as_bytes();
 
         unsafe {
-            self.insert_bytes(idx, bits.as_slice());
+            self.insert_bytes(idx, bits);
         }
     }