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AmbigFDs.hs:10:8: error: [GHC-25897]
• Couldn't match type ‘b1’ with ‘b2’
arising from a functional dependency between constraints:
‘C a b2’
arising from a type ambiguity check for
the type signature for ‘foo’ at AmbigFDs.hs:10:8-35
‘C a b1’
arising from the type signature for:
foo :: forall a b1 b2.
(C a b1, C a b2) =>
a -> Int at AmbigFDs.hs:10:8-35
‘b1’ is a rigid type variable bound by
the type signature for:
foo :: forall a b1 b2. (C a b1, C a b2) => a -> Int
at AmbigFDs.hs:10:8-35
‘b2’ is a rigid type variable bound by
the type signature for:
foo :: forall a b1 b2. (C a b1, C a b2) => a -> Int
at AmbigFDs.hs:10:8-35
• In the ambiguity check for ‘foo’
To defer the ambiguity check to use sites, enable AllowAmbiguousTypes
In the type signature: foo :: (C a b1, C a b2) => a -> Int
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