[Haskell-cafe] instance for (Show ([(String, Int)] -> Int))

[Henning Thielemann]

On Fri, 24 Dec 2010, Aaron Gray wrote:

> The compiler is requesting an instance declaration for Show :-
> 
>   expr-eval.hs:334:23:
>       No instance for (Show ([(String, Int)] -> Int))
>         arising from a use of `print' at expr-eval.hs:334:23-27
>       Possible fix:
>         add an instance declaration for (Show ([(String, Int)] -> Int))
>       In the first argument of `(.)', namely `print'
>       In the second argument of `(>>=)', namely `print . calc . lexer'
>       In the expression: getContents >>= print . calc . lexer

... maybe 'calc' needs a further argument?