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GHC/Type system

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= Type system extensions in GHC =
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<span style='font-size: x-large; font-weight: bold'>Type system extensions in GHC</span>
   
 
GHC comes with a rather large collection of type-system extensions (beyond Haskell 98). They are all documented in the [http://www.haskell.org/ghc/docs/latest/html/users_guide/type-extensions.html user manual], but this page is a place to record observations, notes, and suggestions on them.
 
GHC comes with a rather large collection of type-system extensions (beyond Haskell 98). They are all documented in the [http://www.haskell.org/ghc/docs/latest/html/users_guide/type-extensions.html user manual], but this page is a place to record observations, notes, and suggestions on them.
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== Stand-alone deriving clauses ==
 
== Stand-alone deriving clauses ==
   
Bjorn Bringert has recently implemented [[GHC/StandAloneDeriving|"stand-alone deriving" declarations]].
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Bjorn Bringert has recently implemented [[GHC/Stand-alone deriving declarations|"stand-alone deriving" declarations]].
 
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Revision as of 19:09, 1 November 2006

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 observations, notes, and suggestions on them.

1 Overlapping instances

Here an interesting message about the interaction of existential types and overlapping instances.

2 Indexed data types and indexed newtypes

Indexed data types (including associated data types) are a very recent addition to GHC's type system extensions that is not yet included in the user manual. To use the extension, you need to obtain a version of GHC from its source repository.

3 Stand-alone deriving clauses

Bjorn Bringert has recently implemented "stand-alone deriving" declarations.