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T20666.hs:13:10: error: [GHC-39999]
• Could not deduce ‘Show (T c)’
arising from the superclasses of an instance declaration
from the context: (D d, c ~ S d)
bound by the instance declaration at T20666.hs:13:10-31
Possible fix:
If the constraint looks soluble from a superclass of the instance context,
read 'Undecidable instances and loopy superclasses' in the user manual
• In the instance declaration for ‘C1 c’
T20666.hs:17:10: error: [GHC-39999]
• Could not deduce ‘Show (T c)’
arising from the superclasses of an instance declaration
from the context: (D d, c ~ S d, c' ~ c)
bound by the instance declaration at T20666.hs:17:10-40
Possible fix:
If the constraint looks soluble from a superclass of the instance context,
read 'Undecidable instances and loopy superclasses' in the user manual
• In the instance declaration for ‘C2 c'’
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