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holes2.hs:3:5: Warning:
No instance for (Show a0) arising from a use of ‛show’
The type variable ‛a0’ is ambiguous
Note: there are several potential instances:
instance Show Double -- Defined in ‛GHC.Float’
instance Show Float -- Defined in ‛GHC.Float’
instance (Integral a, Show a) => Show (GHC.Real.Ratio a)
-- Defined in ‛GHC.Real’
...plus 24 others
In the expression: show _
In an equation for ‛f’: f = show _
holes2.hs:3:10: Warning:
Found hole ‛_’ with type: a0
Where: ‛a0’ is an ambiguous type variable
Relevant bindings include f :: String (bound at holes2.hs:3:1)
In the first argument of ‛show’, namely ‛_’
In the expression: show _
In an equation for ‛f’: f = show _
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