I think we should have a registry of all the clauses that different
(match ...) implementations have. It would be indexed by clause, and for
each clause we'd list which variants of match support it. This would
make it easier understand and compare match implementations and write
portable code.

Would someone like to help me gather and format the data? Sources at least:

SRFI 200 is a good starting point:
https://srfi.schemers.org/srfi-200/srfi-200.html

SRFI 204: https://srfi.schemers.org/srfi-204/srfi-204.html

Racket docs: https://docs.racket-lang.org/reference/match.html

Chibi docs:
http://snow-fort.org/s/gmail.com/alexshinn/chibi/match/0.9.0/index.html

Kawa docs:
https://www.gnu.org/software/kawa/Conditionals.html#idm45230723433200

Gambit source: https://github.com/gambit/gambit/tree/master/lib/_match