[GHC] #9576: -fdefer-type-errors doesn't defer errors from `deriving`

[GHC]

#9576: -fdefer-type-errors doesn't defer errors from `deriving`
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              Reporter:  goldfire    |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.8.3
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"74ae59896e4222a8115f5548845f13495f5bb76e/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="74ae59896e4222a8115f5548845f13495f5bb76e"
 Defer errors in derived instances

 Fixes Trac #9576.  Turned out to be pretty easy.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9576#comment:1>
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