[GHC] #3693: Show stack traces

[GHC]

#3693: Show stack traces
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        Reporter:  jpet              |            Owner:  Tarrasch
            Type:  feature request   |           Status:  new
        Priority:  normal            |        Milestone:  7.10.1
       Component:  Runtime System    |          Version:  6.10.4
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by simonmar):

 Thanks, I'll find some time to look through these in detail.  One question
 straight off: in the comment on SourceNote (which is good, BTW), you wrote

   results of annotated code *must* be invariant against changes to all
 source code *except* the spans referenced in the source notes.

 But surely the value of an expression depends on the values of its free
 variables?  The statement only seems to be true for closed expressions.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/3693#comment:59>
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