char fix

library/core/src/char/convert.rs

@@ -21,6 +21,7 @@ pub(super) const fn from_u32(i: u32) -> Option<char> {
 /// Converts a `u32` to a `char`, ignoring validity. See [`char::from_u32_unchecked`].
 #[inline]
 #[must_use]
+#[cfg_attr(not(bootstrap), allow(redundant_transmutation))]
 pub(super) const unsafe fn from_u32_unchecked(i: u32) -> char {
     // SAFETY: the caller must guarantee that `i` is a valid char value.
     unsafe {
@@ -247,7 +248,7 @@ const fn char_try_from_u32(i: u32) -> Result<char, CharTryFromError> {
         Err(CharTryFromError(()))
     } else {
         // SAFETY: checked that it's a legal unicode value
-        Ok(unsafe { transmute(i) })
+        Ok(unsafe { char::from_u32_unchecked(i) })
     }
 }