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Constify residual_into_try_type #149135

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Merged
bors merged 1 commit into from
Nov 21, 2025
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Constify residual_into_try_type #149135

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5 changes: 4 additions & 1 deletion library/core/src/ops/try_trait.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -371,11 +371,14 @@ pub const trait Residual<O>: Sized {
/// but importantly not on the contextual type the way it would be if
/// we called `<_ as FromResidual>::from_residual(r)` directly.
#[unstable(feature = "try_trait_v2_residual", issue = "91285")]
#[rustc_const_unstable(feature = "const_try_residual", issue = "91285")]
// needs to be `pub` to avoid `private type` errors
#[expect(unreachable_pub)]
#[inline] // FIXME: force would be nice, but fails -- see #148915
#[lang = "into_try_type"]
pub fn residual_into_try_type<R: Residual<O>, O>(r: R) -> <R as Residual<O>>::TryType {
pub const fn residual_into_try_type<R: [const] Residual<O>, O>(
r: R,
) -> <R as Residual<O>>::TryType {
FromResidual::from_residual(r)
}

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