[GHC] #7989: "No constructor has all these fields" message can be improved

[GHC]

#7989: "No constructor has all these fields" message can be improved
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    Reporter:  akio              |       Owner:                  
        Type:  feature request   |      Status:  patch           
    Priority:  normal            |   Milestone:                  
   Component:  Compiler          |     Version:  7.7             
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  Other           
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Comment(by aljee@…):

 commit d67b99347f5af146b699b1df174687a4de08fa1a
 {{{
 Author: Takano Akio <aljee at hyper.cx>
 Date:   Mon Jun 17 18:42:09 2013 +0900

     Improve "No data constructor has all these fields" message (#7989)

  compiler/typecheck/TcExpr.lhs |   55
 ++++++++++++++++++++++++++++++++++++++---
  1 files changed, 51 insertions(+), 4 deletions(-)
 }}}

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7989#comment:10>
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