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T19977b.hs:21:5: error:
• Could not deduce ‘C a’ arising from a use of ‘h’
from the context: D a
bound by the type signature for:
g :: forall a. D a => a
at T19977b.hs:20:1-13
Possible fix:
add (C a) to the context of
the type signature for:
g :: forall a. D a => a
• In the expression: h
In an equation for ‘g’: g = h
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