[GHC] #7268: Explicit type signatures for top level record pattern matches polymorphism fail

[GHC]

#7268: Explicit type signatures for top level record pattern matches polymorphism
fail
----------------------------------------+-----------------------------------
    Reporter:  TristanAllwood           |       Owner:  simonpj                  
        Type:  bug                      |      Status:  new                      
    Priority:  normal                   |   Milestone:  7.8.1                    
   Component:  Compiler (Type checker)  |     Version:  7.4.1                    
    Keywords:                           |          Os:  Unknown/Multiple         
Architecture:  Unknown/Multiple         |     Failure:  GHC rejects valid program
  Difficulty:  Unknown                  |    Testcase:                           
   Blockedby:                           |    Blocking:                           
     Related:                           |  
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Comment(by simonpj@…):

 commit 0452021e726ab44f3866faacf7817ac116bb58db
 {{{
 Author: Simon Peyton Jones <simonpj at microsoft.com>
 Date:   Wed May 15 10:15:47 2013 +0100

     Fix typechecking of pattern bindings that have type signatures (Trac
 #7268)

     Pattern bindings are jolly tricky to typecheck, especially if there
 are
     also type signatures involved.  Trac #7268 pointed out that I'd got it
     wrong; this fixes it.  See Note [Typing patterns in pattern bindings]
 in TcPat.

  compiler/typecheck/TcBinds.lhs |   21 ++++------
  compiler/typecheck/TcPat.lhs   |   81
 +++++++++++++++++++++------------------
  2 files changed, 52 insertions(+), 50 deletions(-)
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7268#comment:3>
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