Why Haskell is not yet ready for the mainstream…

2014-07-24

The indecipherability of Haskell error messages

PS C:\Users\rcook> ghci
GHCi, version 7.8.2: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Prelude> 1 2
<interactive>:2:1:
    Could not deduce (Num (a0 -> t))
      arising from the ambiguity check for `it'
    from the context (Num (a -> t), Num a)
      bound by the inferred type for `it': (Num (a -> t), Num a) => t
      at <interactive>:2:1-3
    The type variable `a0' is ambiguous
    When checking that `it'
      has the inferred type `forall a t. (Num (a -> t), Num a) => t'
    Probable cause: the inferred type is ambiguous
Prelude>

Enough said.

Tags: Haskell

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