[GHC] #7371: Supporting old GHC versions in our libraries

[GHC]

#7371: Supporting old GHC versions in our libraries
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        Reporter:  igloo             |                   Owner:
            Type:  task              |                  Status:  closed
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Build System      |                 Version:  7.6.1
      Resolution:  fixed             |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Changes (by thomie):

 * status:  new => closed
 * resolution:   => fixed


Comment:

 Not a GHC task. But library maintainers do this by using Travis to test
 their library with several versions of GHC. See for example:
 https://github.com/haskell/filepath/blob/master/.travis.yml

 Phabricator is also configured to be 2 generations older than HEAD.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7371#comment:4>
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