Make Option::as_mut const

2021-10-17 00:02:42 +09:00
parent 7fbd4ce276
commit 00dba3a693
2 changed files with 10 additions and 1 deletions
--- a/library/core/src/option.rs
+++ b/library/core/src/option.rs
@@ -646,7 +646,8 @@ impl<T> Option<T> {
    /// ```
    #[inline]
    #[stable(feature = "rust1", since = "1.0.0")]
-    pub fn as_mut(&mut self) -> Option<&mut T> {
+    #[rustc_const_unstable(feature = "const_option", issue = "67441")]
+    pub const fn as_mut(&mut self) -> Option<&mut T> {
        match *self {
            Some(ref mut x) => Some(x),
            None => None,