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T11347.hs:6:41: error: [GHC-10283]
• Couldn't match representation of type ‘a’ with that of ‘b’
arising from the coercion of the method ‘unsafe’
from type ‘Id1 a -> Discern (Id1 a) b’
to type ‘Id2 a -> Discern (Id2 a) b’
‘a’ is a rigid type variable bound by
the deriving clause for ‘UnsafeCast b (Id2 a)’
at T11347.hs:6:41-52
‘b’ is a rigid type variable bound by
the deriving clause for ‘UnsafeCast b (Id2 a)’
at T11347.hs:6:41-52
• When deriving the instance for (UnsafeCast b (Id2 a))
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