[GHC] #9867: PatternSynonyms + ScopedTypeVariables triggers an internal error

[GHC]

#9867: PatternSynonyms + ScopedTypeVariables triggers an internal error
-------------------------------------+-------------------------------------
        Reporter:  antalsz           |                   Owner:  cactus
            Type:  bug               |                  Status:  merge
        Priority:  normal            |               Milestone:
       Component:  Compiler (Type    |                 Version:  7.8.3
  checker)                           |                Keywords:
      Resolution:                    |  PatternSynonyms
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash                              |               Test Case:
      Blocked By:                    |  patsyn/should_compile/T9867
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
Changes (by simonpj):

 * status:  new => merge
 * testcase:   => patsyn/should_compile/T9867


Comment:

 Fixed by
 {{{
 commit 3ea40e38a7ae03c05cb79485fb04a3f00c632793
 Author: Simon Peyton Jones <simonpj at microsoft.com>
 Date:   Mon Jan 19 09:06:21 2015 +0000

     Fix the 'builder' code for pattern synonyms with type signatures

     See Note [Type signatures and the builder expression] for the details

  compiler/typecheck/TcPatSyn.hs |  144
 ++++++++++++++++++++++------------------
  1 file changed, 79 insertions(+), 65 deletions(-)
 }}}
 and follow up wibble
 {{{
 commit 9a1458266b8fa349c9fb58889825d899a762fa27
 Author: Simon Peyton Jones <simonpj at microsoft.com>
 Date:   Mon Jan 19 10:20:39 2015 +0000

     Add missing argument in Match, a merge bug (apologies)

  compiler/typecheck/TcPatSyn.hs |    4 ++--
  1 file changed, 2 insertions(+), 2 deletions(-)
 }}}
 We could consider merging this to 7.10.  It isn't huge, but let's do it if
 it's easy.

 Simon

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9867#comment:8>
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