diff --git a/library/core/src/option.rs b/library/core/src/option.rs index 7b9c6e43960..145c7ff5c32 100644 --- a/library/core/src/option.rs +++ b/library/core/src/option.rs @@ -1523,8 +1523,15 @@ impl Option<&T> { /// ``` #[must_use = "`self` will be dropped if the result is not used"] #[stable(feature = "rust1", since = "1.0.0")] - pub fn cloned(self) -> Option { - self.map(|t| t.clone()) + #[rustc_const_unstable(feature = "const_option_cloned", issue = "91582")] + pub const fn cloned(self) -> Option + where + T: ~const Clone, + { + match self { + Some(t) => Some(t.clone()), + None => None, + } } } @@ -1541,9 +1548,17 @@ impl Option<&mut T> { /// let cloned = opt_x.cloned(); /// assert_eq!(cloned, Some(12)); /// ``` + #[must_use = "`self` will be dropped if the result is not used"] #[stable(since = "1.26.0", feature = "option_ref_mut_cloned")] - pub fn cloned(self) -> Option { - self.map(|t| t.clone()) + #[rustc_const_unstable(feature = "const_option_cloned", issue = "91582")] + pub const fn cloned(self) -> Option + where + T: ~const Clone, + { + match self { + Some(t) => Some(t.clone()), + None => None, + } } }