[GHC] #13710: panic with boot and -jX

[GHC]

#13710: panic with boot and -jX
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        Reporter:  pacak             |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1-rc2
      Resolution:                    |             Keywords:  hs-boot
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by ezyang):

 This bug is kind of similar to #12063, in that the panic is induced when
 we attempt to use interfaces prior to having checked that everything is
 squared away. The interface usage is probably related to parallel mode.
 I'll take a look.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13710#comment:4>
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