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Rollup merge of #95753 - ChayimFriedman2:patch-1, r=dtolnay

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Correct safety reasoning in `str::make_ascii_{lower,upper}case()`

I don't understand why the previous comment was used (it was inserted in #66564), but it doesn't explain why these functions are safe, only why `str::as_bytes{_mut}()` are safe.

If someone thinks they make perfect sense, I'm fine with closing this PR.
This commit is contained in:
Dylan DPC 2022-04-07 11:17:16 +02:00 committed by GitHub
commit 6639604bd6
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1 changed files with 2 additions and 2 deletions
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library/core/src/str/mod.rs
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@ -2407,7 +2407,7 @@ impl str {
#[stable(feature = "ascii_methods_on_intrinsics", since = "1.23.0")]
#[inline]
pub fn make_ascii_uppercase(&mut self) {
// SAFETY: safe because we transmute two types with the same layout.
// SAFETY: changing ASCII letters only does not invalidate UTF-8.
let me = unsafe { self.as_bytes_mut() };
me.make_ascii_uppercase()
}
@ -2434,7 +2434,7 @@ impl str {
#[stable(feature = "ascii_methods_on_intrinsics", since = "1.23.0")]
#[inline]
pub fn make_ascii_lowercase(&mut self) {
// SAFETY: safe because we transmute two types with the same layout.
// SAFETY: changing ASCII letters only does not invalidate UTF-8.
let me = unsafe { self.as_bytes_mut() };
me.make_ascii_lowercase()
}