/// Basic usage:
///
/// ```
- /// #![feature(result_map_or_else)]
/// let k = 21;
///
/// let x : Result<_, &str> = Ok("foo");
/// assert_eq!(x.map_or_else(|e| k * 2, |v| v.len()), 42);
/// ```
#[inline]
- #[unstable(feature = "result_map_or_else", issue = "53268")]
+ #[stable(feature = "result_map_or_else", since = "1.41.0")]
pub fn map_or_else<U, D: FnOnce(E) -> U, F: FnOnce(T) -> U>(self, default: D, f: F) -> U {
match self {
Ok(t) => f(t),