On Dec 17, 2015, at 8:15 AM, George Karachalias
What do you think? I have already implemented a first patch with two options: If the number of guards is small run the check and say nothing. If not, check for 2 possible flags: -fwarn-pattern-guards ==> Give it your best -fwarn-ignore-pattern-guards ==> Do not run the check on the cases with many guards without a warning None of the two enabled? ==> Give a warning of the form:
T783.hs:4:1: warning: Pattern match checking failed for an equation for foo due to the big number of guards (Use -fwarn-ignore-pattern-guards if you want to hide this message or -fwarn-pattern-guards if you want the checker to run no matter what) I don't have much comment on your implementation techniques, as I don't know this end of the operation well enough to have an opinion.
For the point above: what if both flags are enabled? Richard