[GHC] #12775: T3424 hangs with -fregs-graph

[GHC]

#12775: T3424 hangs with -fregs-graph
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           Reporter:  tjakway        |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:  T3424          |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 The -fregs-graph option causes rts/T3424 to hang.
 I waited 15+ minutes when compiling with inplace/ghc-stage2 before killing
 it; when run with the test suite after a similarly long time I get a
 compile failed (exit code 99) message.  It passes when run in ghci or when
 using the default register allocator.

 To reproduce:
 make TEST=T3424 EXTRA_HC_OPTIONS=-fregs-graph

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12775>
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