[GHC] #13239: Phabricator upgrade broke the ticket custom field

[GHC]

#13239: Phabricator upgrade broke the ticket custom field
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           Reporter:  mpickering     |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           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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 We have one custom field which should also appear in commit messages when
 running "arc diff".

 Since the upgrade on 07/02/2017, the field no longer appears when running
 "arc diff".

 The upgrade path is detailed in this upstream task.

 https://secure.phabricator.com/T12085

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13239>
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