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readFail003.hs:4:27: error:
• Couldn't match expected type ‘(a, [a1], [a2])’
with actual type ‘a’
• In the expression: a
In a pattern binding:
~(a, b, c)
| nullity b = a
| nullity c = a
| otherwise = a
where
nullity = null
• Relevant bindings include
a :: a (bound at readFail003.hs:4:3)
b :: [a1] (bound at readFail003.hs:4:5)
c :: [a2] (bound at readFail003.hs:4:7)
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