[shawn_w]

I think you got your wires crossed. R5 and R7 only have `syntax-rules` macros. R6 has both (`syntax-rule` can be trivially defined as a `syntax-case` macro).

R6 having `syntax-case` macros is one of the more controversial things about it; a surprising number of implementers don't care for them.

[ashton314]

I found the relevant documentation and you are absolutely correct and I was mistaken. Thank you for setting me straight.

https://www.scheme.com/tspl4/syntax.html#./syntax:h3