[GHC] #15692: GHC panic from pattern synonyms + deferred type errors

[GHC]

#15692: GHC panic from pattern synonyms + deferred type errors
-------------------------------------+-------------------------------------
        Reporter:  Iceland_jack      |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.6.1
      Resolution:                    |             Keywords:
                                     |  PatternSynonyms
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by RyanGlScott):

 * cc: simonpj (added)


Comment:

 Somewhat ironically, commit 149d7912eb84a24861b021c13d2ee61b44de5856 (`Fix
 error recovery for pattern synonyms`) introduced this.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15692#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler