On Wed, Mar 26, 2003 at 07:40:30AM -0800, Andy Moran wrote:
On Wednesday 26 March 2003 07:23 am, David Roundy wrote:
I would try using Debug.Trace.trace. It takes a string and an expression, and returns the expressions while outputting the string to stderr (I think). You can choose your own mnemonics to prevent the truncation problem.
Thanks for the hint! I like trace, strongly reminiscent of the good old technique of sprinkling printfs around. :) It turned out the problem was running sequence on an infinite list of type [Maybe a]. In retrospect obvious, but sort of hard to notice (especially since the infinite list is created in a different module from the sequence call. Fortunately, in this case it is safe to just truncate the list to some large size (since the function in question is only used in the quickChecking code, and not in the actual code). -- David Roundy http://civet.berkeley.edu/droundy/