[GHC] #15281: GHC 8.6.1 can't be bootstrapped with GHC 8.2.1

[GHC]

#15281: GHC 8.6.1 can't be bootstrapped with GHC 8.2.1
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  high              |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D4863
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by bgamari):

 * status:  new => patch
 * differential:   => Phab:D4863


Comment:

 Phab:D4863 adds a `configure` check to avoid confusion due to this.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15281#comment:1>
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