[GHC] #11604: Build system fails after submodule update

[GHC]

#11604: Build system fails after submodule update
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        Reporter:  niteria           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Build System      |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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@@ -8,0 +8,1 @@
+ git submodule update

New description:

 I got [https://phabricator.haskell.org/P100 this] error after updating the
 transformers submodule with `git submodule update --remote
 libraries/transformers`.

 Steps to repro:
 {{{
 git checkout 426a25c719f74054758eaaf15daf5760f8d068fb
 git submodule update
 make clean && make distclean && ./boot && ./configure && make
 git submodule update --remote libraries/transformers
 make
 }}}

--

Comment (by niteria):

 They were in sync with `426a25c719f74054758eaaf15daf5760f8d068fb`, the
 state you get after
 {{{
 git checkout 426a25c719f74054758eaaf15daf5760f8d068fb
 git submodule update
 }}}

 I'll update the repro to reflect that.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11604#comment:2>
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