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# How to write extension descriptions
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For pros & cons, please include how difficult this feature is to implement, how much it is used, whether it is a convenience or the only way to get a particular feature, whether any formal description exists, etc.
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Use this template:
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```wiki
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= Overlapping Instances =
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[[PageOutline]]
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See also ExtensionDescriptionHowto.
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== Brief Explanation ==
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== References ==
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* [http://www.haskell.org/ghc/docs/latest/html/users_guide/type-extensions.html#instance-overlap Section on overlapping instances] in the GHC User's Guide.
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== Pros ==
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* Pro
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* Pro
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== Cons ==
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* Con
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* Con
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``` |
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\ No newline at end of file |