[GHC] #10946: Typed hole inside typed Template Haskell bracket causes panic

[GHC]

#10946: Typed hole inside typed Template Haskell bracket causes panic
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        Reporter:  jstolarek         |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.4.1
       Component:  Template Haskell  |              Version:  7.10.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash                              |            Test Case:  th/T10946
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 So in f64f7c36ef9395da1cc7b686aaf1b019204cd0fc, we added a test case for
 this that was marked as `expect_broken`. However, that program now loops
 infinitely on GHC HEAD!

 {{{
 $ inplace/bin/ghc-stage2 --interactive
 GHCi, version 8.5.20180305: http://www.haskell.org/ghc/  :? for help
 Loaded GHCi configuration from /home/rgscott/.ghci
 λ> :set -XTemplateHaskell
 λ> m :: a -> a; m x = $$([||_||]) -- Loops infinitely
 ^CInterrupted.
 }}}

 Should we disable the test case entirely in the meantime?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10946#comment:9>
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