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T15552a.hs:26:9: error:
• Illegal nested use of type family ‘FirstEntryOfVal’
in the arguments of the type-family application ‘GetEntryOfVal
(FirstEntryOfVal v kvs)’
(Use UndecidableInstances to permit this)
• In the equations for closed type family ‘FirstEntryOfVal’
In the type family declaration for ‘FirstEntryOfVal’
T15552a.hs:26:9: error:
• Illegal nested use of type family ‘FirstEntryOfVal’
in the arguments of the type-family application ‘EntryOfValKey
(FirstEntryOfVal v kvs)’
(Use UndecidableInstances to permit this)
• In the equations for closed type family ‘FirstEntryOfVal’
In the type family declaration for ‘FirstEntryOfVal’
T15552a.hs:26:9: error:
• Illegal nested use of type family ‘FirstEntryOfVal’
in the arguments of the type-family application ‘EntryOfValKey
(FirstEntryOfVal v kvs)’
(Use UndecidableInstances to permit this)
• In the equations for closed type family ‘FirstEntryOfVal’
In the type family declaration for ‘FirstEntryOfVal’
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