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drvfail011.hs:8:1: error:
• No instance for (Eq a) arising from a use of ‘==’
Possible fix: add (Eq a) to the context of the instance declaration
• In the expression: a1 == b1
In an equation for ‘==’: (==) (T1 a1) (T1 b1) = ((a1 == b1))
When typechecking the code for ‘==’
in a derived instance for ‘Eq (T a)’:
To see the code I am typechecking, use -ddump-deriv
In the instance declaration for ‘Eq (T a)’
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