[GHC] #10407: git head no longer builds with ghc < 7.10

[GHC]

#10407: git head no longer builds with ghc < 7.10
-------------------------------------+-------------------------------------
              Reporter:  erikd       |             Owner:  erikd
                  Type:  bug         |            Status:  new
              Priority:  normal      |         Milestone:
             Component:  Compiler    |           Version:  7.11
              Keywords:              |  Operating System:  Unknown/Multiple
          Architecture:              |   Type of failure:  Building GHC
  Unknown/Multiple                   |  failed
             Test Case:              |        Blocked By:
              Blocking:              |   Related Tickets:
Differential Revisions:              |
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 Building git head after commit 4fffbc34c0 with ghc-7.8 or ghc-7.6 I get:

 {{{
 compiler/typecheck/TcInteract.hs:2034:13:
     Not in scope: ‘<$>’
     Perhaps you meant one of these:
       ‘TcM.<$>’ (imported from TcRnMonad),
       ‘<+>’ (imported from Outputable),
       ‘TcM.<*>’ (imported from TcRnMonad)

 compiler/typecheck/TcInteract.hs:2034:29:
     Not in scope: ‘<$>’
     Perhaps you meant one of these:
       ‘TcM.<$>’ (imported from TcRnMonad),
       ‘<+>’ (imported from Outputable),
       ‘TcM.<*>’ (imported from TcRnMonad)
 }}}

 The `<$>` operator is only available by default in ghc 7.10 and later.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10407>
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