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nachf :: Integer -> Integer
nachf n = n + 1

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:load meinefkt.hs

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Prelude> :load test.hs
[1 of 1] Compiling Main             ( test.hs, interpreted )
Ok, modules loaded: Main.
*Main> succ
succ  succ
*Main> succ 5

<interactive>:4:1:
    Ambiguous occurrence `succ'
    It could refer to either `Main.succ', defined at test.hs:2:1
                          or `Prelude.succ',
                             imported from `Prelude' at test.hs:1:1
                             (and originally defined in `GHC.Enum')