[GHC] #8205: the 'impossible' happened : expectJust block_order

[GHC]

#8205: the 'impossible' happened : expectJust block_order
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        Reporter:  erikd                |            Owner:  jstolarek
            Type:  bug                  |           Status:  new
        Priority:  normal               |        Milestone:
       Component:  Compiler             |          Version:  7.7
      Resolution:                       |         Keywords:
Operating System:  Unknown/Multiple     |     Architecture:
 Type of failure:  Building GHC failed  |  Unknown/Multiple
       Test Case:                       |       Difficulty:  Unknown
        Blocking:                       |       Blocked By:
                                        |  Related Tickets:
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Comment (by Jan Stolarek <jan.stolarek@…>):

 In [changeset:bec3c0497fa55e84005d175e0fc6b1d72df961e1/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="bec3c0497fa55e84005d175e0fc6b1d72df961e1"
 Drop proc-points that don't exist in the graph (#8205)

 On some architectures it might happen that stack layout pass will
 invalidate the list of calculated procpoints by dropping some of
 them. We fix this by checking whether a proc-point is in a graph
 at the beginning of proc-point analysis. This is a speculative
 fix for #8205.
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8205#comment:20>
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