[GHC] #7347: Existential data constructors should not be promoted

[GHC]

#7347: Existential data constructors should not be promoted
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    Reporter:  simonpj           |       Owner:                  
        Type:  bug               |      Status:  new             
    Priority:  normal            |   Milestone:                  
   Component:  Compiler          |     Version:  7.6.1           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Comment(by simonpj@…):

 commit 8019bc2cb7b2883bdf0da49ccdc52ecc9e2ad2fc
 {{{
 Author: Simon Peyton Jones <simonpj at microsoft.com>
 Date:   Fri Oct 19 12:53:21 2012 +0100

     Only promote *non-existential* data constructors

     I don't konw how this was left out before; Trac #7347.

     In fixing this I did the usual round of refactoring.  In particular, I
     cached the fact that a DataCon can be promoted in the DataCon
     itself (the dcPromoted field).

  compiler/basicTypes/DataCon.lhs |   69
 ++++++++++++++++++++------------------
  compiler/iface/TcIface.lhs      |    4 +-
  compiler/prelude/TysWiredIn.lhs |    6 ++--
  compiler/types/TyCon.lhs        |    2 +-
  4 files changed, 42 insertions(+), 39 deletions(-)
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7347#comment:8>
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