[GHC] #9900: Support pattern synonyms in GHCi

[GHC]

#9900: Support pattern synonyms in GHCi
-------------------------------------+-------------------------------------
              Reporter:  cactus      |            Owner:  cactus
                  Type:  feature     |           Status:  new
  request                            |        Milestone:  7.8.4
              Priority:  normal      |          Version:  7.8.3
             Component:  GHCi        |         Keywords:  PatternSynonyms
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:  9915
       Type of failure:  GHC         |  Related Tickets:  #8749, #7253
  rejects valid program              |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------

Comment (by cactus):

 I have a fix for this on the `wip/T9900` branch, but I'm waiting for
 instructions on how to trigger a Harbourmaster build on the branch before
 merging it to `master`.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9900#comment:6>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler