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T7148.hs:27:40: error:
• Couldn't match type ‘b’ with ‘Tagged a b’
arising from the coercion of the method ‘iso2’
from type ‘forall b. SameType b () -> SameType b b’
to type ‘forall b. SameType b () -> SameType b (Tagged a b)’
‘b’ is a rigid type variable bound by
the deriving clause for ‘IsoUnit (Tagged a b)’ at T7148.hs:27:40-46
• When deriving the instance for (IsoUnit (Tagged a b))
T7148.hs:27:40: error:
• Couldn't match type ‘b’ with ‘Tagged a b’
arising from the coercion of the method ‘iso1’
from type ‘forall b. SameType () b -> SameType b b’
to type ‘forall b. SameType () b -> SameType (Tagged a b) b’
‘b’ is a rigid type variable bound by
the deriving clause for ‘IsoUnit (Tagged a b)’ at T7148.hs:27:40-46
• When deriving the instance for (IsoUnit (Tagged a b))
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