[GHC] #13930: Cabal configure

[GHC]

#13930: Cabal configure
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by bgamari):

 * priority:  normal => high
 * failure:  None/Unknown => Runtime performance bug
 * milestone:   => 8.4.1


Comment:

 The first bad commit here is,
 {{{
 commit 751996e90a964026a3f86853338f10c82db6b610
 Author: Simon Peyton Jones <simonpj at microsoft.com>
 Date:   Fri Apr 7 17:10:07 2017 +0100

     Kill off complications in CoreFVs

     When doing type-in-type, Richard introduce some substantial
     complications in CoreFVs, gathering types and free variables
     of type.  In Trac #13160 we decided that this complication was
     unnecessary, so this patch removes it.

     ...
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13930#comment:3>
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