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I'm new to Haskell and after starting ghci I tried:
f x = 2 * x
and I obtained:
<interactive>:1:4: parse error on input `='
which I don't understand.
Strangely, it worked well before. I suppose that I have done misconfigured Haskell. Reinstalling ghc6 doesn't solve the problem.
For information, I use Ubuntu 10.4 and the version of ghc6 is 6.12.1-12