[GHC] #624: Program location for thread error messages

[GHC]

#624: Program location for thread error messages
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        Reporter:  chak              |                   Owner:
            Type:  task              |                  Status:  new
        Priority:  normal            |               Milestone:  ⊥
       Component:  Compiler          |                 Version:  None
      Resolution:  None              |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by bgamari):

 It seems like the recently merge implicit-parameter-based stack-trace work
 (see Phab:D578) would be quite useful for this. Blocking actions could
 take an implicit `SrcLoc` which could be providing along with the error in
 the event of indefinite blocking.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/624#comment:9>
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