[GHC] #15254: Cabal submodule bump is needed

[GHC]

#15254: Cabal submodule bump is needed
-------------------------------------+-------------------------------------
        Reporter:                    |                Owner:  (none)
  quasicomputational                 |
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.5
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by mpickering):

 I have also observed this error with HEAD.

 Related
 https://github.com/snowleopard/hadrian/issues/609#issuecomment-396080601

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15254#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler