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by dekhn 714 days ago
It appears to be a GNU C extension: https://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html but I couldn't find the history of the extension. I believe it is not in standard C (not sure about clang).
2 comments
nj5rq 714 days ago
I just tried it, and it works with clang version 17.0.6.
link
astrange 714 days ago
Clang supports almost all GNU C extensions. Maybe not nested functions because they need executable stacks.
link