We should also ask Alex Shinn to bring his implementation in line with the other (and previous) implementation. There is a simple change necessary here:

https://github.com/ashinn/chibi-scheme/blob/master/lib/init-7.scm#L731

Just change "compare" into "eq?", which is bound-identifier=? in the syntactic closures implementation, Chibi is using. (I made the change locally, and all tests continue to pass.)