[GHC] #16071: GHC is stuck (runs indefinitely) compiling a module

[GHC]

#16071: GHC is stuck (runs indefinitely) compiling a module
-------------------------------------+-------------------------------------
           Reporter:  dirtypaw       |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.6.3
           Keywords:                 |  Operating System:  Windows
       Architecture:  x86_64         |   Type of failure:  Building GHC
  (amd64)                            |  failed
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 Compiling
 [https://github.com/agda/agda/commit/e68360b16af7865519bef77c21c66ff88139ea7e
 Agda] with ghc-8.6.3 using stack, ghc is stuck at
 [https://github.com/agda/agda/blob/master/src/full/Agda/Syntax/Internal.hs
 this module] (runs for 20+ min with no progress).

 It looks like a regression in ghc-8.6.3 on Windows as Agda is successfully
 built with ghc-8.6.2 on the same machine, and Agda build with ghc-8.6.3 is
 generally supported (see [https://github.com/agda/agda/issues/3442 this
 issue]).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16071>
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