[GHC] #13657: Documentation: Functional dependencies by other means

[GHC]

#13657: Documentation: Functional dependencies by other means
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        Reporter:  AntC              |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Documentation     |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Documentation     |  Unknown/Multiple
  bug                                |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  10431             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by AntC):

 Replying to [comment:1 simonpj]:
 > We could add it to the user manual.

 (I still think the User Manual doesn't really explain the difference
 between SuperClass constraints vs Instance constraints.)

 >
 > But alternatively, and perhaps better, we have
 [https://wiki.haskell.org/GHC GHC's collaborative documentation pages].

 OK. I've transplanted the ticket's text to an added section under "Type
 system extensions" [https://wiki.haskell.org/GHC/SuperClass SuperClass].
 (Strewth! Changing the markup style was fiddly.) And added some of the
 materials from the original ghc-users thread.

 >
 > (The contents page itself could do with some editing work too!)

 Yes, it's a bit of a rag-bag. I guess there's plenty of material on idioms
 and techniques around the web on blogs these days. But that's often
 related to older versions of GHC; and is difficult to search. (I did have
 a quick squiz for stuff on SuperClass constraints, but I don't think this
 ticket is repeating anything 'obvious'.)

 What does GHC HQ see as the 'organising principle' for the collaborative
 doo-hickeys?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13657#comment:2>
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