Tracking issue for const Option functions · Issue #67441 · rust-lang/rust

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Description

Current candidates with feature = const_option:

impl<T> Option<T> {
    pub const fn as_mut(&mut self) -> Option<&mut T>;
    pub const fn expect(self, msg: &str) -> T;
    pub const fn unwrap(self) -> T;
    pub const unsafe fn unwrap_unchecked(self) -> T;
    pub const fn take(&mut self) -> Option<T>;
    pub const fn replace(&mut self, value: T) -> Option<T>;
}

impl<T> Option<&T> {
    pub const fn copied(self) -> Option<T>
    where
        T: Copy;
}

impl<T> Option<&mut T> {
    pub const fn copied(self) -> Option<T>
    where
        T: Copy;
}

impl<T, E> Option<Result<T, E>> {
    pub const fn transpose(self) -> Result<Option<T>, E>
}

impl<T> Option<Option<T>> {
    pub const fn flatten(self) -> Option<T>;
}

See also the meta-tracking issue for const fns, #57563.

Blocked on:

• Tracking issue for &mut T in const contexts (const_mut_refs) #57349
• Tracking Issue for const_replace #83164

Also see the corresponding Result tracking issue: #82814.