[GHC] #13984: Panic when using a TH splice in a do bind pattern

[GHC]

#13984: Panic when using a TH splice in a do bind pattern
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        Reporter:  mbieleck          |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.2.1-rc3
      Resolution:                    |             Keywords:  panic
                                     |  template-haskell
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):  Phab:D3766
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"36e8bcba08446dbc4e7532ef9db5517c13977bf9/ghc"
 36e8bcba/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="36e8bcba08446dbc4e7532ef9db5517c13977bf9"
 HsPat: Assume that no spliced patterns are irrefutable

 This is a conservative assumption which will limit some uses of spliced
 patterns, but it fixes #13984.

 Test Plan: Validate

 Reviewers: RyanGlScott, AaronFriel, austin

 Reviewed By: RyanGlScott

 Subscribers: rwbarton, thomie

 GHC Trac Issues: #13984

 Differential Revision: https://phabricator.haskell.org/D3766
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13984#comment:8>
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