[GHC] #9010: TemplateHaskell leads to an "unknown symbol" error

[GHC]

#9010: TemplateHaskell leads to an "unknown symbol" error
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        Reporter:  Feuerbach         |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      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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Comment (by rwbarton):

 I could not reproduce this on Debian Linux. Does "... and build `play`
 manually" mean something other than...?

 {{{
 cabal sandbox init
 cabal install hs-opencv-binding/
 cabal install play/
 }}}

 Also I seriously doubt that lens is required, can you try simplifying
 `makeLenses ''MyRecord` to just a `return []`?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9010#comment:8>
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