Feature gate: #![feature(option_reference_flattening)]

This is a tracking issue for rust-lang/libs-team#186

This feature lets users of nested referenced options be able to conveniently flatten them into a single option.

Public API

// core::option

impl<'a, T> Option<&'a Option<T>> {
    const fn flatten_ref(self) -> Option<&'a T>;
}

impl<'a, T> Option<&'a mut Option<T>> {
    const fn flatten_ref(self) -> Option<&'a T>;

    const fn flatten_mut(self) -> Option<&'a mut T> {
}

Steps / History

(Remember to update the S-tracking-* label when checking boxes.)

• ACP: Implementing flatten for Option<&Option<T>> and Option<&mut Option<T>>  libs-team#186
• Implementation: Implement flatten for Option<&Option<T>> and Option<&mut Option<T>> #108671
• Final comment period (FCP)¹
• Stabilization PR

Unresolved Questions

• None yet.