Add stability attribute

weiznich · weiznich · commit 0cde1cbb10b0 · 2018-08-09T12:48:55.000+02:00
diff --git a/src/libcore/option.rs b/src/libcore/option.rs
@@ -1064,6 +1064,7 @@ impl<T> From<T> for Option<T> {
     }
 }
 
+#[stable(feature = "option_ref_from_ref_option", since = "1.30.0")]
 impl<'a, T> From<&'a Option<T>> for Option<&'a T> {
     fn from(o: &'a Option<T>) -> Option<&'a T> {
         o.as_ref()

Original file line number	Diff line number	Diff line change
`@@ -1064,6 +1064,7 @@ impl<T> From<T> for Option<T> {`
`1064`	`1064`	`}`
`1065`	`1065`	`}`
`1066`	`1066`
	`1067`	`+#[stable(feature = "option_ref_from_ref_option", since = "1.30.0")]`
`1067`	`1068`	`impl<'a, T> From<&'a Option<T>> for Option<&'a T> {`
`1068`	`1069`	`fn from(o: &'a Option<T>) -> Option<&'a T> {`
`1069`	`1070`	`o.as_ref()`