[MacRuby] #1267: RoxorVM::pop_outer() leaks memory

[MacRuby]

#1267: RoxorVM::pop_outer() leaks memory
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 Reporter:  lsansonetti@…          |       Owner:  lsansonetti@…        
     Type:  defect                 |      Status:  new                  
 Priority:  blocker                |   Milestone:  MacRuby 1.0          
Component:  MacRuby                |    Keywords:                       
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 push_outer() allocates a new outer structure using malloc(), but it's
 never free()'ed, leading to memory leaks for instance when using
 #instance_eval(&b) in a loop.

 We cannot free() the outer in pop_outer() since it may be used somewhere
 else, so we must either introduce reference counting or use xmalloc()
 memory (with appropriate write barriers). I think the later is the best
 solution.

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Ticket URL: <http://www.macruby.org/trac/ticket/1267>
MacRuby <http://macruby.org/>