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# Hackage Experiment
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Isaac ran an experiment on all the packages uploaded to [ http://hackage.haskell.org](http://hackage.haskell.org). This table summarizes the various packages' use of extensions.
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TODO[ Upload more packages](http://hackage.haskell.org/trac/hackage/wiki/CabalPackages) and re-run this experiment.
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<table><tr><th> Extension </th>
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<th> times used
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</th></tr>
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<tr><th>CPP?</th>
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<th> 7
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</th></tr>
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<tr><th>[ExistentialQuantification](existential-quantification)</th>
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<th> 1
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</th></tr>
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<tr><th>[ForeignFunctionInterface](foreign-function-interface)</th>
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<th> 2
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</th></tr>
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<tr><th>[FunctionalDependencies](functional-dependencies)</th>
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<th> 1
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</th></tr>
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<tr><th>[MultiParamTypeClasses](multi-param-type-classes)</th>
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<th> 1
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</th></tr>
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<tr><th>[OverlappingInstances](overlapping-instances)</th>
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<th> 8
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</th></tr>
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<tr><th>TemplateHaskell?</th>
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<th> 1
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</th></tr>
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<tr><th>[TypeSynonymInstances](type-synonym-instances)</th>
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<th> 1
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</th></tr></table>
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errors in 4 packages:
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- haspr-0.3.0
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- hasp-0.3.0
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- hsp-0.2
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- haskelldb-0.9 |
