At Fri, 22 Feb 2013 00:50:27 +0300, Dmitry Cherkassov wrote: > I don't use ``pair?'' though. > > Is there a simple method to find out what function calls (or macroexpands > to) it?
You could try the macro stepper or `raco expand' to see expanded code. You might even resort to `raco decompile' to see more precisely the code that runs. The culprit might be `for' on a list without `in-list'. For example, (for ([i '(1 2 3)]) i) triggers to a higher-order use of `pair?', while (for ([i (in-list '(1 2 3))]) i) doesn't. Unfortunately, though, `pair?' doesn't actually show up in the former expansion, since it comes back from `make-sequence'. Similarly, `for' on an integer without `in-range' triggers a higher-order use of `values' via `make-sequence'. ____________________ Racket Users list: http://lists.racket-lang.org/users
