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FD3.hs:15:15: error:
• Couldn't match type ‘a’ with ‘(String, a)’
arising from a functional dependency between:
constraint ‘MkA (String, a) a’ arising from a use of ‘mkA’
instance ‘MkA a1 a1’ at FD3.hs:12:10-16
‘a’ is a rigid type variable bound by
the type signature for:
translate :: forall a. (String, a) -> A a
at FD3.hs:14:1-31
• In the expression: mkA a
In an equation for ‘translate’: translate a = mkA a
• Relevant bindings include
a :: (String, a) (bound at FD3.hs:15:11)
translate :: (String, a) -> A a (bound at FD3.hs:15:1)
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