[GHC] #13035: GHC enters a loop when partial type signatures and advanced type level code mix

[GHC]

#13035: GHC enters a loop when partial type signatures and advanced type level code
mix
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        Reporter:  xcmw              |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      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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Comment (by RyanGlScott):

 According to a profiled build of GHC HEAD, `TcRnDriver.tc_rn_src_decls` is
 taking up almost 100% of the time and alloc when compiling the program
 above.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13035#comment:3>
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