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tcfail121.hs:13:9:
Overlapping instances for Foo [a] arising from a use of ‘op’
Matching instances:
instance [overlappable] Foo a => Foo [a]
-- Defined at tcfail121.hs:9:31
instance [overlapping] Foo [Int] -- Defined at tcfail121.hs:10:30
(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: op x
In an equation for ‘foo’: foo x = op x
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