Overlap6.hs:15:7:
Couldn't match type ‘x’ with ‘And x 'True’
‘x’ is a rigid type variable bound by
the type signature for: g :: Proxy x -> Proxy (And x 'True)
at Overlap6.hs:14:6
Expected type: Proxy (And x 'True)
Actual type: Proxy x
In the expression: x
In an equation for ‘g’: g x = x
Relevant bindings include
x :: Proxy x (bound at Overlap6.hs:15:3)
g :: Proxy x -> Proxy (And x 'True) (bound at Overlap6.hs:15:1)