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mod71.hs:4:9: error:
• Found hole: _ :: t1
Where: ‘t1’ is a rigid type variable bound by
the inferred type of f :: Num t => (t1 -> t -> t2) -> t2
at mod71.hs:4:1-11
• In the first argument of ‘x’, namely ‘_’
In the expression: x _ 1
In an equation for ‘f’: f x = x _ 1
• Relevant bindings include
x :: t1 -> t -> t2 (bound at mod71.hs:4:3)
f :: (t1 -> t -> t2) -> t2 (bound at mod71.hs:4:1)
Valid substitutions include
undefined :: forall a. GHC.Stack.Types.HasCallStack => a
(imported from ‘Prelude’ at mod71.hs:3:8
(and originally defined in ‘GHC.Err’))
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