Hi, Please bear with a very basic question. I am trying to 'learn me a Haskell for great good' using Hutton's book and some online tutorials. I started off with Hugs and recently used GHC (to use the 'let a = .." syntax interactively, which Hugs doesn't allow perhaps). There's a simple issue I am having with GHC. sum[1..100000] works fine on Hugs, however, the same in GHCi generates a stack overflow exception. I am trying to figure out what's going on. Prelude> sum[1..100000] 5000050000 Prelude> sum[1..1000000] *** Exception: stack overflow Prelude> ________________________ Hugs> sum[1..10000] 50005000 Hugs> sum[1..100000] 5000050000 Hugs> Thanks in anticipation. Best regards, Vishal Belsare ps: please excuse if the question is too uncool for the list. I come from an economics background; the markets are bad, I am depressed and to add to my pain, GHC refuses to let me know sum[1..100000] -- Firstly, I propose for myself the rule that the obviousness of a proposition does not free me from the obligation to continue searching for a proof of it, at least until I clearly realize that absolutely no proof could ever be required, and why. ~ Bernhard Bolzano