[GHC] #10182: lookupIfaceGlobal crash with SOURCE import

[GHC]

#10182: lookupIfaceGlobal crash with SOURCE import
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        Reporter:  simonpj           |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.8.4
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Description changed by simonpj:

Old description:

> Try this (in `testsuite/tests/stranal/should_compile`)
> {{{
> bash$ ghc -c T8743.hs-boot
> bash$ ghc -c T8743.hs
> ghc: panic! (the 'impossible' happened)
>   (GHC version 7.8.2 for x86_64-unknown-linux):
>         tcIfaceGlobal (local): not found:
>     main:T8743.$fxToRowMaybe{v r2J}
>     [(r2L, Class ‘main:T8743.ToRow{tc r2L}’),
>      (r2M, Data constructor ‘main:T8743.D:ToRow{d r2M}’),
>      (r2P, Identifier ‘main:T8743.D:ToRow{v r2P}’),
>      (roB, Identifier ‘main:T8743.toRow{v roB}’),
>      (rqT, Coercion axiom ‘main:T8743.NTCo:ToRow{tc rqT}’)]
> }}}
> Something clearly wrong here. It think this happens with prettty much any
> version of GHC.

New description:

 Try this (in `testsuite/tests/stranal/should_compile`)
 {{{
 bash$ ghc -c T8743.hs-boot
 bash$ ghc -c T8743.hs
 ghc: panic! (the 'impossible' happened)
   (GHC version 7.8.2 for x86_64-unknown-linux):
         tcIfaceGlobal (local): not found:
     main:T8743.$fxToRowMaybe{v r2J}
     [(r2L, Class ‘main:T8743.ToRow{tc r2L}’),
      (r2M, Data constructor ‘main:T8743.D:ToRow{d r2M}’),
      (r2P, Identifier ‘main:T8743.D:ToRow{v r2P}’),
      (roB, Identifier ‘main:T8743.toRow{v roB}’),
      (rqT, Coercion axiom ‘main:T8743.NTCo:ToRow{tc rqT}’)]
 }}}
 Something clearly wrong here. It think this happens with prettty much any
 version of GHC.  I found this when poking about in #10181.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10182#comment:1>
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