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Rollup merge of #91804 - woppopo:const_clone, r=oli-obk

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Make some `Clone` impls `const`

Tracking issue: #91805
`Clone::clone_from` and some impls (Option, Result) bounded on `~const Drop`.

```rust
// core::clone
impl const Clone for INTEGER
impl const Clone for FLOAT
impl const Clone for bool
impl const Clone for char
impl const Clone for !
impl<T: ?Sized> const Clone for *const T
impl<T: ?Sized> const Clone for *mut T
impl<T: ?Sized> const Clone for &T

// core::option
impl<T> const Clone for Option<T>
where
    T: ~const Clone + ~const Drop

// core::result
impl<T, E> const Clone for Result<T, E>
where
    T: ~const Clone + ~const Drop,
    E: ~const Clone + ~const Drop,

// core::convert
impl const Clone for Infallible

// core::ptr
impl<T: ?Sized> const Clone for NonNull<T>
impl<T: ?Sized> const Clone for Unique<T>
```
This commit is contained in:
Matthias Krüger
2022-03-09 23:14:09 +01:00
committed by GitHub
parent 10dccdc7fc 662024478d
commit c0259626b6
7 changed files with 33 additions and 11 deletions
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library/core/src/lib.rs
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@@ -104,6 +104,7 @@
#![feature(const_caller_location)]
#![feature(const_cell_into_inner)]
#![feature(const_char_convert)]
#![feature(const_clone)]
#![feature(const_discriminant)]
#![feature(const_eval_select)]
#![feature(const_float_bits_conv)]