Implement RFC 839 for String

rust-lang · Jun 3, 2015 · e3009d3 · e3009d3
1 parent 11de947
commit e3009d3
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diff --git a/src/libcollections/string.rs b/src/libcollections/string.rs
@@ -793,6 +793,13 @@ impl Extend<char> for String {
     }
 }
 
+#[unstable(feature = "extend_ref", reason = "recently added")]
+impl<'a> Extend<&'a char> for String {
+    fn extend<I: IntoIterator<Item=&'a char>>(&mut self, iter: I) {
+        self.extend(iter.into_iter().cloned());
+    }
+}
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<'a> Extend<&'a str> for String {
     fn extend<I: IntoIterator<Item=&'a str>>(&mut self, iterable: I) {

diff --git a/src/libcollectionstest/string.rs b/src/libcollectionstest/string.rs
@@ -365,6 +365,14 @@ fn test_drain() {
     assert_eq!(t, "");
 }
 
+#[test]
+fn test_extend_ref() {
+    let mut a = "foo".to_string();
+    a.extend(&['b', 'a', 'r']);
+
+    assert_eq!(&a, "foobar");
+}
+
 #[bench]
 fn bench_with_capacity(b: &mut Bencher) {
     b.iter(|| {