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tcfail218.hs:16:5:
Overlapping instances for C [a] Bool arising from a use of ‘foo’
Matching instances:
instance C [a] b -- Defined at tcfail218.hs:8:29
instance C [Int] Bool -- Defined at tcfail218.hs:7:29
(The choice depends on the instantiation of ‘a’
To pick the first instance above, use IncoherentInstances
when compiling the other instance declarations)
In the expression: foo
In an equation for ‘x’: x = foo
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