[MacRuby] #1214: Backtrace incorrect when exception is re-raised

[MacRuby]

#1214: Backtrace incorrect when exception is re-raised
--------------------------------------+-------------------------------------
 Reporter:  warpflyght@…              |       Owner:  lsansonetti@…        
     Type:  defect                    |      Status:  new                  
 Priority:  major                     |   Milestone:                       
Component:  MacRuby                   |    Keywords:                       
--------------------------------------+-------------------------------------
 When re-raising an exception in MacRuby, the topmost frame in the
 backtrace becomes the location of the "raise" used to re-raise, not the
 location of the initial raise. Example program:

 {{{
 #!ruby
 def demonstrate_bug
   raise "Should Originate On Line #{__LINE__}"
 rescue Exception
   raise
 end

 demonstrate_bug
 }}}

 Example output:
 {{{
 $ ruby --version
 ruby 1.8.7 (2009-06-12 patchlevel 174) [universal-darwin10.0]
 $ ruby ./raise.rb
 ./raise.rb:2:in `demonstrate_bug': Should Originate On Line 2
 (RuntimeError)
         from ./raise.rb:7

 $ ruby1.9 --version
 ruby 1.9.1p376 (2009-12-07 revision 26041) [i386-darwin10]
 $ ruby1.9 ./raise.rb
 ./raise.rb:2:in `demonstrate_bug': Should Originate On Line 2
 (RuntimeError)
         from ./raise.rb:7:in `<main>'

 $ macruby --version
 MacRuby 0.11 (ruby 1.9.2) [universal-darwin10.0, x86_64]
 $ macruby ./raise.rb
 /private/tmp/./raise.rb:4:in `demonstrate_bug': Should Originate On Line 2
 (RuntimeError)
         from /private/tmp/./raise.rb:7:in `demonstrate_bug'
 }}}

 Because the backtrace doesn't include frames above the rescue block, it
 isn't useful for debugging re-raised exceptions. The workaround is to
 capture the backtrace of the exception before re-raising (probably
 printing it out yourself).

 I'm using
 [https://github.com/MacRuby/MacRuby/commit/c59dc4930d2b2166ee1527bb45914599553c5bba
 commit c59dc4930d2b2166ee1527bb45914599553c5bba] on a 64-bit machine
 running Mac OS X 10.6.7.

-- 
Ticket URL: <http://www.macruby.org/trac/ticket/1214>
MacRuby <http://macruby.org/>