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copied!<p>I think a more appropriate categorization would be to divide it up by the compiler pipeline:</p> <p><strong>Syntactic extensions</strong></p> <ul> <li>-XMagicHash</li> <li>-XUnicodeSyntax </li> <li>-XNewQualifiedOperators</li> <li>-XViewPatterns</li> <li>-XNPlusKPatterns </li> <li>-XDoRec</li> <li>-XTransformListComp</li> <li>-XNoImplicitPrelude</li> <li>-XPostfixOperators</li> <li>-XTupleSections </li> <li>-XDisambiguateRecordFields</li> <li>-XNamedFieldPuns</li> <li>-XRecordWildCards</li> <li>-XPackageImports</li> <li>-XExplicitForAll</li> <li>-XKindSignatures</li> <li>...</li> </ul> <p><strong>Type System Extensions</strong></p> <ul> <li>-XUnboxedTuples</li> <li>-XLiberalTypeSynonyms</li> <li>-XGADTs</li> <li>-XMultiParamTypeClasses</li> <li>-XFlexibleContexts</li> <li>-XConstrainedClassMethods</li> <li>-XOverlappingInstances and -XIncoherentInstances</li> <li>-XTypeFamilies</li> <li>-XImplicitParams</li> </ul> <p><strong>Cross-cutting extensions</strong></p> <ul> <li>-XTemplateHaskell</li> <li>-XForeignFunctionInterface</li> </ul> <p><strong>Optimizatsions</strong></p> <ul> <li>-fenable-rewrite-rules</li> <li>-fspec-constr</li> <li>-O2</li> </ul> <p><strong>Code Generation Extensions</strong></p> <ul> <li>-fllvm</li> <li>-fasm</li> <li>-fvia-C</li> </ul> <p><strong>Runtime Extensions</strong></p> <ul> <li>-threaded</li> </ul> <p>What do you think? Not every flag is either (a) definable in terms of existing constructions, or (b) a new part of the compiler. It's more subtle.</p> <p>There are many other extensions too, see if you can classify them in this form.</p>

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