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T7869.hs:3:12: error:
• Couldn't match type ‘b1’ with ‘b’
Expected: [a1] -> b1
Actual: [a] -> b
‘b1’ is a rigid type variable bound by
an expression type signature:
forall a1 b1. [a1] -> b1
at T7869.hs:3:20-27
‘b’ is a rigid type variable bound by
the inferred type of f :: [a] -> b
at T7869.hs:3:1-27
• In the expression: f x
In the expression: (\ x -> f x) :: [a] -> b
In an equation for ‘f’: f = (\ x -> f x) :: [a] -> b
• Relevant bindings include f :: [a] -> b (bound at T7869.hs:3:1)
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