[GHC] #14411: `make fasttest` exits successfully even in presence of failures

[GHC]

#14411: `make fasttest` exits successfully even in presence of failures
-------------------------------------+-------------------------------------
           Reporter:  Fuuzetsu       |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Build System   |           Version:  8.2.1
           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:
-------------------------------------+-------------------------------------
 {{{
 ./boot
 ./configure
 make
 make fasttest
 …
 }}}

 I have seen on OSX that even when tests failed, `make fasttest` exited
 successfully. I have informed Ben at the time and this ticket is just to
 track progress.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14411>
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