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

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merged 1 commit into from
Jan 15, 2022

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clarfonthey
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@clarfonthey clarfonthey commented Dec 29, 2021

This adds constness to all the blanket impls in core::convert under the existing const_convert feature, tracked by #88674.

Existing impls under that feature:

impl<T> const From<T> for T;
impl<T, U> const Into<U> for T where U: ~const From<T>;

impl<T> const ops::Try for Option<T>;
impl<T> const ops::FromResidual for Option<T>;

impl<T, E> const ops::Try for Result<T, E>;
impl<T, E, F> const ops::FromResidual<Result<convert::Infallible, E>> for Result<T, F> where F: ~const From<E>;

Additional impls:

impl<T: ?Sized, U: ?Sized> const AsRef<U> for &T where T: ~const AsRef<U>;
impl<T: ?Sized, U: ?Sized> const AsRef<U> for &mut T where T: ~const AsRef<U>;
impl<T: ?Sized, U: ?Sized> const AsMut<U> for &mut T where T: ~const AsMut<U>;

impl<T, U> const TryInto<U> for T where U: ~const TryFrom<T>;
impl<T, U> const TryFrom<U> for T where U: ~const Into<T>;

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r? @scottmcm

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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Dec 29, 2021
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This seems reasonable, given than it's only available unstable.

@bors r+

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bors commented Jan 11, 2022

📌 Commit b1b873f has been approved by scottmcm

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jan 11, 2022
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request Jan 14, 2022
Extend const_convert to rest of blanket core::convert impls

This adds constness to all the blanket impls in `core::convert` under the existing `const_convert` feature, tracked by rust-lang#88674.

Existing impls under that feature:

```rust
impl<T> const From<T> for T;
impl<T, U> const Into<U> for T where U: ~const From<T>;

impl<T> const ops::Try for Option<T>;
impl<T> const ops::FromResidual for Option<T>;

impl<T, E> const ops::Try for Result<T, E>;
impl<T, E, F> const ops::FromResidual<Result<convert::Infallible, E>> for Result<T, F> where F: ~const From<E>;
```

Additional impls:

```rust
impl<T: ?Sized, U: ?Sized> const AsRef<U> for &T where T: ~const AsRef<U>;
impl<T: ?Sized, U: ?Sized> const AsRef<U> for &mut T where T: ~const AsRef<U>;
impl<T: ?Sized, U: ?Sized> const AsMut<U> for &mut T where T: ~const AsMut<U>;

impl<T, U> const TryInto<U> for T where U: ~const TryFrom<T>;
impl<T, U> const TryFrom<U> for T where U: ~const Into<T>;
```
bors added a commit to rust-lang-ci/rust that referenced this pull request Jan 15, 2022
…askrgr

Rollup of 9 pull requests

Successful merges:

 - rust-lang#92191 (Prefer projection candidates instead of param_env candidates for Sized predicates)
 - rust-lang#92382 (Extend const_convert to rest of blanket core::convert impls)
 - rust-lang#92625 (Add `#[track_caller]` to `mirbug`)
 - rust-lang#92684 (Export `tcp::IntoIncoming`)
 - rust-lang#92743 (Use pre-interned symbols in a couple of places)
 - rust-lang#92838 (Clean up some links in RELEASES)
 - rust-lang#92868 (librustdoc: Address some clippy lints)
 - rust-lang#92875 (Make `opt_const_param_of` work in the presence of `GenericArg::Infer`)
 - rust-lang#92891 (Add myself to .mailmap)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 1d9ab77 into rust-lang:master Jan 15, 2022
@rustbot rustbot added this to the 1.60.0 milestone Jan 15, 2022
@clarfonthey clarfonthey deleted the const_convert branch January 15, 2022 07:42
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5 participants