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For completeness, I'd like to have: (define (arg-count->bitmask min-count max-count) ...) where min-count is the minimum number of arguments, and max-count is the maximum number, or -1. (A non-infinite maximum is useful for optional arguments.) That is easy (just a couple of shifts and masks); a little harder are the inverse functions: (define (bitmask->min-count mask) ...) (define (bitmask->max-count mask) ...) I think these are expressible using bitwise-length and bitwise-first-bit-set, but I haven't tried to work it out. -- --Per Bothner per@xxxxxxxxxxx http://per.bothner.com/