based on the grammar snippet posted earlier, it looks as though
the compiler is correct.  a case label in C is not so different from a label
(thus duff's device is allowed), and as i understood the snippet,
declarations can't be labelled.  might make you wonder why they
bothered, and indeed, i do wonder.  i think they should leave the language alone.
(and if they were going to do more than tinker,
they might have added something significant, such as tuples.)