scheme@(guile-user)> (use-modules (srfi srfi-19)) scheme@(guile-user)> (time-difference (make-time time-tai 0 1) (make-time time-utc 0 1)) $1 = #<time type: time-duration nanosecond: 0 second: 0>
SRFI-19 is explicit that it "is an error" if the arguments to time-difference are of different time types, and correspondingly the Guile documentation says the arguments "must be" of the same type. It would be very easy for time-difference to detect and signal this error. It's not absolutely a bug that it currently doesn't, but it would be a useful improvement if it did. -zefram
