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