[GHC] #5462: Deriving clause for arbitrary classes

[GHC]

#5462: Deriving clause for arbitrary classes
-------------------------------------+-------------------------------------
              Reporter:  simonpj     |            Owner:  dreixel
                  Type:  feature     |           Status:  new
  request                            |        Milestone:  ⊥
              Priority:  normal      |          Version:  7.2.1
             Component:  Compiler    |         Keywords:  Generics
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:  #7346
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------

Comment (by rwbarton):

 Can't we determine the context for the derived instance from the contexts
 of the default method type signatures?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5462#comment:29>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler