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Extend const_convert to rest of blanket core::convert impls #92382

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Jan 15, 2022
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Extend const_convert to rest of blanket core::convert impls #92382

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25 changes: 15 additions & 10 deletions library/core/src/convert/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -485,9 +485,10 @@ pub trait TryFrom<T>: Sized {

// As lifts over &
#[stable(feature = "rust1", since = "1.0.0")]
impl<T: ?Sized, U: ?Sized> AsRef<U> for &T
#[rustc_const_unstable(feature = "const_convert", issue = "88674")]
impl<T: ?Sized, U: ?Sized> const AsRef<U> for &T
where
T: AsRef<U>,
T: ~const AsRef<U>,
{
fn as_ref(&self) -> &U {
<T as AsRef<U>>::as_ref(*self)
Expand All @@ -496,9 +497,10 @@ where

// As lifts over &mut
#[stable(feature = "rust1", since = "1.0.0")]
impl<T: ?Sized, U: ?Sized> AsRef<U> for &mut T
#[rustc_const_unstable(feature = "const_convert", issue = "88674")]
impl<T: ?Sized, U: ?Sized> const AsRef<U> for &mut T
where
T: AsRef<U>,
T: ~const AsRef<U>,
{
fn as_ref(&self) -> &U {
<T as AsRef<U>>::as_ref(*self)
Expand All @@ -515,9 +517,10 @@ where

// AsMut lifts over &mut
#[stable(feature = "rust1", since = "1.0.0")]
impl<T: ?Sized, U: ?Sized> AsMut<U> for &mut T
#[rustc_const_unstable(feature = "const_convert", issue = "88674")]
impl<T: ?Sized, U: ?Sized> const AsMut<U> for &mut T
where
T: AsMut<U>,
T: ~const AsMut<U>,
{
fn as_mut(&mut self) -> &mut U {
(*self).as_mut()
Expand Down Expand Up @@ -571,9 +574,10 @@ impl<T> const From<!> for T {

// TryFrom implies TryInto
#[stable(feature = "try_from", since = "1.34.0")]
impl<T, U> TryInto<U> for T
#[rustc_const_unstable(feature = "const_convert", issue = "88674")]
impl<T, U> const TryInto<U> for T
where
U: TryFrom<T>,
U: ~const TryFrom<T>,
{
type Error = U::Error;

Expand All @@ -585,9 +589,10 @@ where
// Infallible conversions are semantically equivalent to fallible conversions
// with an uninhabited error type.
#[stable(feature = "try_from", since = "1.34.0")]
impl<T, U> TryFrom<U> for T
#[rustc_const_unstable(feature = "const_convert", issue = "88674")]
impl<T, U> const TryFrom<U> for T
where
U: Into<T>,
U: ~const Into<T>,
{
type Error = Infallible;

Expand Down