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tcfail153.hs:6:7: error:
• Couldn't match type ‘a’ with ‘Bool’
Expected: [a]
Actual: [Bool]
‘a’ is a rigid type variable bound by
the type signature for:
f :: forall a. a -> [a]
at tcfail153.hs:5:1-13
• In the expression: g x
In an equation for ‘f’:
f x
= g x
where
g y = if y then [] else [...]
• Relevant bindings include
x :: a (bound at tcfail153.hs:6:3)
f :: a -> [a] (bound at tcfail153.hs:6:1)
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