Personal tools

GHC/Type system

From HaskellWiki

< GHC(Difference between revisions)
Jump to: navigation, search
m (Link, headings)
(+cat)
Line 1: Line 1:
  +
[[Category:GHC|Type system]]
 
<span style='font-size: x-large; font-weight: bold'>Type system extensions in GHC</span>
 
<span style='font-size: x-large; font-weight: bold'>Type system extensions in GHC</span>
   

Revision as of 03:19, 14 January 2007

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.