assignment in a method with default argument strip off other arguments.
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                 Key: JRUBY-5773
                 URL: http://jira.codehaus.org/browse/JRUBY-5773
             Project: JRuby
          Issue Type: Bug
          Components: Compiler
    Affects Versions: JRuby 1.6.1
         Environment: Fedora 14 (64bit) and Mac OSX 10.6.7
            Reporter: Chung Shin Yee
            Priority: Minor


The following code segment shows that the assignment c = 30 will result in the 
argument b being stripped off to become nil.

$ jruby --1.9 -S jirb
irb(main):001:0> def work(a = 10, b)
irb(main):002:1>   puts a.inspect
irb(main):003:1>   puts b.inspect
irb(main):004:1>   c = 30
irb(main):005:1> end
=> nil
irb(main):006:0> work(20, 25)
20
nil
=> 30


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