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T4528.hs:9:1:
Can't make a derived instance of ‘Enum (Foo a)’:
‘Foo’ must be an enumeration type
(an enumeration consists of one or more nullary, non-GADT constructors)
In the stand-alone deriving instance for ‘Enum (Foo a)’
T4528.hs:10:1:
Can't make a derived instance of ‘Bounded (Foo a)’:
‘Foo’ must be an enumeration type
(an enumeration consists of one or more nullary, non-GADT constructors)
or
‘Foo’ must have precisely one constructor
In the stand-alone deriving instance for ‘Bounded (Foo a)’
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