* src/tr.c (main) [!POSIXLY_CORRECT]: Allow the identity mappings:
[:upper:] to [:upper:] and [:lower:] to [:lower:].
- (main) [POSIXLY_CORRECT]: Give a more specific diagnostic for the
- identity mappings [:upper:] to [:upper:] and [:lower:] to [:lower:].
+ (main) [POSIXLY_CORRECT]: Give a more specific diagnostic for
+ the invalid identity mappings [:upper:] to [:upper:] and [:lower:]
+ to [:lower:].
(class_ok): Update table to reflect that tr now allows these
identity mappings. Suggestion from Risto Kankkunen.