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module Main where
-- GHC 4.04
-- I've been having problems getting GHC to compile some code I'm working
-- on with optimisation (-O) turned on. Compilation is fine without -O
-- specified. Through a process of elimination I've managed to reproduce
-- the problemin the following (much simpler) piece of code:
import Data.List (groupBy)
test es =
concat (groupBy eq (zip [0..(length es) - 1] es))
where
eq a b = (fst a) == (fst b)
main = putStr (show (test [1,2,3,4]))
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