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make Result::copied unstably const #130090

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merged 3 commits into from
Sep 9, 2024
Merged

make Result::copied unstably const #130090

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03e0c8e
make Result::copied unstably const
RalfJung Sep 7, 2024
3de6838
add some FIXME(const-hack)
RalfJung Sep 8, 2024
f7b4f4a
Option, Result: put the &mut variants of 'copied' under the same feat…
RalfJung Sep 8, 2024
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10 changes: 8 additions & 2 deletions library/core/src/result.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1535,11 +1535,17 @@ impl<T, E> Result<&T, E> {
/// ```
#[inline]
#[stable(feature = "result_copied", since = "1.59.0")]
pub fn copied(self) -> Result<T, E>
#[rustc_const_unstable(feature = "const_result", issue = "82814")]
pub const fn copied(self) -> Result<T, E>
where
T: Copy,
{
self.map(|&t| t)
// FIXME: this implementation, which sidesteps using `Result::map` since it's not const
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// ready yet, should be reverted when possible to avoid code repetition
match self {
Ok(&v) => Ok(v),
Err(e) => Err(e),
}
}

/// Maps a `Result<&T, E>` to a `Result<T, E>` by cloning the contents of the
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