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Rollup merge of #94657 - fee1-dead:const_slice_index, r=oli-obk

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Constify `Index{,Mut}` for `[T]`, `str`, and `[T; N]`

Several panic functions were rewired (via `const_eval_select`) to simpler implementations that do not require formatting for compile-time usage.

r? ```@oli-obk```
This commit is contained in:
Matthias Krüger
2022-03-10 12:20:52 +01:00
committed by GitHub
parent 313a668234 4654a91001
commit fe034cb43b
13 changed files with 160 additions and 66 deletions
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10
library/core/src/array/mod.rs
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@@ -276,9 +276,10 @@ impl<'a, T, const N: usize> IntoIterator for &'a mut [T; N] {
}
#[stable(feature = "index_trait_on_arrays", since = "1.50.0")]
impl<T, I, const N: usize> Index<I> for [T; N]
#[rustc_const_unstable(feature = "const_slice_index", issue = "none")]
impl<T, I, const N: usize> const Index<I> for [T; N]
where
[T]: Index<I>,
[T]: ~const Index<I>,
{
type Output = <[T] as Index<I>>::Output;
@@ -289,9 +290,10 @@ where
}
#[stable(feature = "index_trait_on_arrays", since = "1.50.0")]
impl<T, I, const N: usize> IndexMut<I> for [T; N]
#[rustc_const_unstable(feature = "const_slice_index", issue = "none")]
impl<T, I, const N: usize> const IndexMut<I> for [T; N]
where
[T]: IndexMut<I>,
[T]: ~const IndexMut<I>,
{
#[inline]
fn index_mut(&mut self, index: I) -> &mut Self::Output {