I guess this transformation is what I'm looking for:
(transform
(list
stuff ...
(if test
(list yes ...)
(list no ...))
more ...))
=>
(if test
(transform (list stuff ... yes ... more ...))
(transform (list stuff ... no ... more ...)))
but of course you can't put anything after the ... in the same list in a
syntax-rules pattern, not to mention there's no indication which ellipses
correspond to what. I don't know how flattening using syntax-rules is even
possible...
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