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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 a => (t1 -> a -> t) -> t
at mod71.hs:4:1
Relevant bindings include
x :: t1 -> a -> t (bound at mod71.hs:4:3)
f :: (t1 -> a -> t) -> t (bound at mod71.hs:4:1)
In the first argument of ‘x’, namely ‘_’
In the expression: x _ 1
In an equation for ‘f’: f x = x _ 1
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