[<<][compsci][>>][..]Wed Oct 26 16:33:32 EDT 2011
Notes: - GHC's default behaviour is that exactly one instance must match the constraint it is trying to resolve. - It is fine for there to be a potential of overlap; an error is only reported if a particular constraint matches more than one. - The -fallow-overlapping-instances flag instructs GHC to allow more than one instance to match, provided there is a most specific one [1] http://www.haskell.org/ghc/docs/6.6/html/users_guide/type-extensions.html
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