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make unstable Result::flatten a const fn #130692

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Merged
merged 1 commit into from
Sep 22, 2024
Merged

make unstable Result::flatten a const fn #130692

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1 change: 1 addition & 0 deletions library/core/src/option.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2538,6 +2538,7 @@ impl<T> Option<Option<T>> {
#[stable(feature = "option_flattening", since = "1.40.0")]
#[rustc_const_unstable(feature = "const_option", issue = "67441")]
pub const fn flatten(self) -> Option<T> {
// FIXME(const-hack): could be written with `and_then`
match self {
Some(inner) => inner,
None => None,
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9 changes: 7 additions & 2 deletions library/core/src/result.rs
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Expand Up @@ -1676,8 +1676,13 @@ impl<T, E> Result<Result<T, E>, E> {
/// ```
#[inline]
#[unstable(feature = "result_flattening", issue = "70142")]
pub fn flatten(self) -> Result<T, E> {
self.and_then(convert::identity)
#[rustc_const_unstable(feature = "result_flattening", issue = "70142")]
pub const fn flatten(self) -> Result<T, E> {
// FIXME(const-hack): could be written with `and_then`
match self {
Ok(inner) => inner,
Err(e) => Err(e),
}
}
}

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