ptr::copy: fix docs for the overlapping case #134606
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Some changes occurred to the CTFE machinery cc @rust-lang/wg-const-eval Some changes occurred to the intrinsics. Make sure the CTFE / Miri interpreter cc @rust-lang/miri, @rust-lang/wg-const-eval Some changes occurred to the CTFE / Miri interpreter cc @rust-lang/miri |
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Fixes rust-lang/unsafe-code-guidelines#549
As discussed in that issue, it doesn't make any sense for
copyto read a byte viasrcafter it was already written viadst. The entire point of this method is that is copies correctly even if they overlap, and that requires always reading any given location before writing it.Cc @rust-lang/opsem