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T7194.hs:18:35: error:
• Couldn't match expected type ‘b0’ with actual type ‘F a’
because type variable ‘a’ would escape its scope
This (rigid, skolem) type variable is bound by
the type signature for:
g :: forall a. C (F a) => a -> Int
at T7194.hs:17:18-41
• In the expression: foo y
In the first argument of ‘length’, namely ‘[x, foo y]’
In the expression: length [x, foo y]
• Relevant bindings include
y :: a (bound at T7194.hs:18:20)
g :: a -> Int (bound at T7194.hs:18:18)
x :: b0 (bound at T7194.hs:17:9)
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