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Add stability attribute

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Georg Semmler 2018-08-09 12:48:55 +02:00
parent ef519c1de5
commit 0cde1cbb10
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src/libcore/option.rs
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@ -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> { impl<'a, T> From<&'a Option<T>> for Option<&'a T> {
fn from(o: &'a Option<T>) -> Option<&'a T> { fn from(o: &'a Option<T>) -> Option<&'a T> {
o.as_ref() o.as_ref()