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tcfail218.hs:10:5:
Overlapping instances for C [a] b arising from a use of ‛foo’
Matching instances:
instance [incoherent] C [a] b -- Defined at tcfail218.hs:5:10
instance C [Int] b -- Defined at Tcfail218_Help.hs:7:10
(The choice depends on the instantiation of ‛a, b’
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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