Const unwrap_or

Author: pickfire

library/core/src/option.rs

@@ -386,8 +386,9 @@ impl<T> Option<T> {
     /// assert_eq!(None.unwrap_or("bike"), "bike");
     /// ```
     #[inline]
+    #[rustc_const_unstable(feature = "const_option", issue = "67441")]
     #[stable(feature = "rust1", since = "1.0.0")]
-    pub fn unwrap_or(self, default: T) -> T {
+    pub const fn unwrap_or(self, default: T) -> T {
         match self {
             Some(x) => x,
             None => default,

library/core/src/result.rs

@@ -796,8 +796,9 @@ impl<T, E> Result<T, E> {
     /// assert_eq!(x.unwrap_or(default), default);
     /// ```
     #[inline]
+    #[rustc_const_unstable(feature = "const_result", issue = "67520")]
     #[stable(feature = "rust1", since = "1.0.0")]
-    pub fn unwrap_or(self, default: T) -> T {
+    pub const fn unwrap_or(self, default: T) -> T {
         match self {
             Ok(t) => t,
             Err(_) => default,