Difference between revisions of "GHC/Type system"

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(typo + new topic per SPJ https://ghc.haskell.org/trac/ghc/ticket/13657#comment:1)
(fix link to users guide)
 
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* '''[[GHC/Stand-alone deriving declarations|"Stand-alone deriving" declarations]]'''
 
* '''[[GHC/Stand-alone deriving declarations|"Stand-alone deriving" declarations]]'''
 
* '''[[GHC/TypeSigsAndAmbiguity|Type signatures and ambiguity]]'''
 
* '''[[GHC/TypeSigsAndAmbiguity|Type signatures and ambiguity]]'''
* '''Overlapping instances'''. GHC supports overlapping instances, with carefully specified rules. Make sure you read the [http://www.haskell.org/ghc/docs/latest/html/users_guide/type-class-extensions.html#instance-decls relevant sections of the user manual]. Here is an application note about [[GHC/AdvancedOverlap|advanced use of overlapping instances]], combined with functional dependencies.
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* '''Overlapping instances'''. GHC supports overlapping instances, with carefully specified rules. Make sure you read the [https://downloads.haskell.org/ghc/latest/docs/html/users_guide/glasgow_exts.html#instance-declarations relevant sections of the user manual]. Here is an application note about [[GHC/AdvancedOverlap|advanced use of overlapping instances]], combined with functional dependencies.
 
* '''[[GHC/SuperClass|Super-Class Constraints: Type Families, Type Equalities, FunDep, Overlaps]]'''
 
* '''[[GHC/SuperClass|Super-Class Constraints: Type Families, Type Equalities, FunDep, Overlaps]]'''
 
* '''[[GHC/Coercible|Safe coercions using Coercible]]'''
 
* '''[[GHC/Coercible|Safe coercions using Coercible]]'''

Latest revision as of 06:11, 23 July 2020

Type system extensions in GHC

GHC comes with a rather large collection of type-system extensions (beyond Haskell 98). They are all documented in the user manual, but this page is a place to record user-oriented observations, notes, and suggestions on how to use them.