Hal Daume <[EMAIL PROTECTED]> writes: > [seq is] useful for: > > debug :: Show a => a -> a > debug x = unsafePerformIO (hPutStrLn stderr (show x)) `seq` x > > (Presumably "trace" is defined similarly) > > One may ask the question: what is seq useful for not in conjunction with > unsafePerformIO, other than efficiency. That, I don't know the answer to.
Of course, this can be defined without seq: > debug :: Show a => a -> a > debug x = unsafePerformIO (hPutStrLn stderr (show x) >> return x) -- Alastair Reid Reid Consulting (UK) Ltd _______________________________________________ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell
