[GHC] #16113: T14740 fails in debugged compiler

[GHC]

#16113: T14740 fails in debugged compiler
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           Reporter:  bgamari        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  high           |         Milestone:  8.8.1
          Component:  Compiler       |           Version:  8.6.3
  (Type checker)                     |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 {{{#!patch
 --- parser/should_fail/T14740.run/T14740.stderr.normalised      2018-12-30
 16:06:27.120170052 +0000
 +++ parser/should_fail/T14740.run/T14740.comp.stderr.normalised 2018-12-30
 16:06:27.120170052 +0000
 @@ -1,4 +1,5 @@
 +ghc: panic! (the 'impossible' happened)
 +  (GHC version 8.7.20181230 for x86_64-unknown-linux):
 +       ASSERT failed! file compiler/types/TyCoRep.hs, line 911

 -T14740.hs:5:7:
 -     Expecting a lifted type, but ‘(# #)’ is unlifted
 -     In the type signature: x :: ((# #)) => ()
 +Please report this as a GHC bug:  https://www.haskell.org/ghc/reportabug
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16113>
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