#16378: bkpcabal01 fails with recent Cabal

#16378: bkpcabal01 fails with recent Cabal
-------------------------------------+-------------------------------------
           Reporter:  bgamari        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  highest        |         Milestone:  8.8.1
          Component:  Compiler       |           Version:  8.6.3
           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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 After bumping `Cabal` on the `ghc-8.8` branch `bkpcabal01` fails:
 {{{
 =====> bkpcabal01(normal) 85 of 6807 [0, 0, 0]
 cd "backpack/cabal/bkpcabal01/bkpcabal01.run" && $MAKE -s --no-print-
 directory bkpcabal01 CLEANUP=1
 Wrong exit code for bkpcabal01()(expected 0 , actual 2 )
 Stdout ( bkpcabal01 ):
 Makefile:9: recipe for target 'bkpcabal01' failed
 Stderr ( bkpcabal01 ):
 Error:
     The following packages are broken because other packages they depend
 on are missing. These broken packages must be rebuilt before they can be
 used.
 planned package bkpcabal01-0.1.0.0 is broken due to missing package
 p-0.1+FBOSaiWyMx9DR2UZVI6wQJ

 }}}

 Anyone know what is going on here?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16378>