-O Bug

[Axel Krauth]

Hi!

Compiling the program

>main =
>  do
>  _ <- compute "_"
>  return ()
>
>compute :: String -> String
>compute ("hd"++_) = "_"

with 

ghc -c Bug.lhs

results in the obvious errors
but compiling with

ghc -O -c Bug.lhs

rather results in

<<loop>>

which looks to me like a bug in ghc.
I tried this with
ghc 4.08,4.08.1 and egcs 1.1.2 on solaris and linux

bye,
Axel
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>main =
>  do
>  _ <- compute "_"
>  return ()
>
>compute :: String -> String
>compute ("hd"++_) = "_"
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