Implement From for more types on Cow

1 files changed, 7 insertions, 0 deletions

diff --git a/src/liballoc/vec.rs b/src/liballoc/vec.rs
index b184404c15b..be4c80c85d9 100644
--- a/src/liballoc/vec.rs
+++ b/src/liballoc/vec.rs
@@ -2285,6 +2285,13 @@ impl<'a, T: Clone> From<Vec<T>> for Cow<'a, [T]> {
     }
 }
 
+#[stable(feature = "cow_from_vec_ref", since = "1.28.0")]
+impl<'a, T: Clone> From<&'a Vec<T>> for Cow<'a, [T]> {
+    fn from(v: &'a Vec<T>) -> Cow<'a, [T]> {
+        Cow::Borrowed(v.as_slice())
+    }
+}
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<'a, T> FromIterator<T> for Cow<'a, [T]> where T: Clone {
     fn from_iter<I: IntoIterator<Item = T>>(it: I) -> Cow<'a, [T]> {