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Language extensions

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(List of language extensions by name)
(List of language extensions by name)
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* [[KindSignatures]]
 
* [[KindSignatures]]
 
* [[Multi-parameter type class|MultiParamTypeClasses]] : Enable multiple type parameters in type classes.
 
* [[Multi-parameter type class|MultiParamTypeClasses]] : Enable multiple type parameters in type classes.
  +
* [[Monomorphism restriction|NoMonomorphismRestriction]]
 
* [[Overlapping instance|OverlappingInstances]]
 
* [[Overlapping instance|OverlappingInstances]]
 
* [[Rank-N types|Rank2Types]]
 
* [[Rank-N types|Rank2Types]]
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* [[Scoped type variables|ScopedTypeVariables]]
 
* [[Scoped type variables|ScopedTypeVariables]]
 
* [[Template Haskell|TemplateHaskell]]
 
* [[Template Haskell|TemplateHaskell]]
  +
* [http://www.haskell.org/ghc/docs/latest/html/users_guide/syntax-extns.html#tuple-sections TupleSections] : Allow tuples to be partially applied.
 
* [[GHC/Type families|TypeFamilies]]
 
* [[GHC/Type families|TypeFamilies]]
 
* [[Undecidable instance|UndecidableInstances]]
 
* [[Undecidable instance|UndecidableInstances]]
  +
* [http://www.haskell.org/ghc/docs/latest/html/users_guide/syntax-extns.html#view-patterns ViewPatterns]
   
   

Revision as of 20:30, 11 November 2012

Language extensions are used to enable language features in Haskell that may seem useful in certain cases. They can be used to loosen restrictions in the type system or add completely new language constructs to Haskell.

They can be enabled using the LANGUAGE pragma or (in GHC) using the flag -X. The LANGUAGE pragma should be preferred here.

Before just using the language extension that fits your need, think about when it is useful and what risk it may bring to your program.

List of language extensions by name

This list is far from complete and needs extension.