[GHC] #15140: GHC 8.4.2 installation crash with Stack

[GHC]

#15140: GHC 8.4.2 installation crash with Stack
------------------------------------------+------------------------------
        Reporter:  fpanahi                |                Owner:  (none)
            Type:  bug                    |               Status:  new
        Priority:  normal                 |            Milestone:  8.6.1
       Component:  Build System           |              Version:  8.4.2
      Resolution:                         |             Keywords:
Operating System:  Windows                |         Architecture:  x86
 Type of failure:  Installing GHC failed  |            Test Case:
      Blocked By:                         |             Blocking:
 Related Tickets:                         |  Differential Rev(s):
       Wiki Page:                         |
------------------------------------------+------------------------------

Comment (by fpanahi):

 I reported to https://github.com/commercialhaskell/stack/issues, issue
 #4020.

 Sorry, I am new in Haskell, and don't know how to do it without Stack.
 Do I need to rollback in some way?

 Thanks for your help.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15140#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler