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256b6fb19a
revert stabilization of const_intrinsic_copy `@rust-lang/wg-const-eval` I don't know what we were thinking when we approved https://github.com/rust-lang/rust/pull/97276... const-eval isn't supposed to be able to mutate anything yet! It's also near impossible to actually call `copy` in const on stable since `&mut` expressions are generally unstable. However, there's one exception... ```rust static mut INT: i32 = unsafe { let val = &mut [1]; // `&mut` on arrays is allowed in `static mut` (val as *mut [i32; 1]).copy_from(&[42], 1); val[0] }; fn main() { unsafe { dbg!(INT); } } ``` Inside `static mut`, we accept some `&mut` since ~forever, to make `static mut FOO: &mut [T] = &mut [...];` work. We reject any attempt to actually write to that mutable reference though... except for the `copy` functions. I think we should revert stabilizing these functions that take `*mut`, and then re-stabilize them together with `ptr.write` once mutable references are stable. (This will likely fail on PowerPC until https://github.com/rust-lang/stdarch/pull/1497 lands. But we'll need a crater run first anyway.) |
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