diff options
| -rw-r--r-- | library/core/src/str/mod.rs | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/library/core/src/str/mod.rs b/library/core/src/str/mod.rs index 6bfa6a5e015..82208c4deaa 100644 --- a/library/core/src/str/mod.rs +++ b/library/core/src/str/mod.rs @@ -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() } |