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sellout/gist:9d26d5c0613404eeb362

Created May 7, 2014 03:49
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gistfile1.txt
class Foo a where
class Bar a where
instance Foo a => Bar a where
instance (Foo a, Foo b) => Bar (a, b) where
-- line 7 col 10:
-- Overlapping instance: Bar a already defined
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