Fiber.yield crahes if called without arguments
----------------------------------------------

                 Key: JRUBY-3615
                 URL: http://jira.codehaus.org/browse/JRUBY-3615
             Project: JRuby
          Issue Type: Bug
         Environment: Ubuntu 8.10
java version "1.6.0_10"
Java(TM) SE Runtime Environment (build 1.6.0_10-b33)
Java HotSpot(TM) Server VM (build 11.0-b15, mixed mode)
            Reporter: Larry Diehl
            Assignee: Thomas E Enebo
            Priority: Minor


Fiber.yield will crashes if called without arguments (this is not the case in 
Ruby 1.9):

require 'fiber'
fiber = Fiber.new do
  Fiber.yield
  :returned
end

fiber.resume
puts fiber.resume


Running the code above causes:
Exception in thread "Thread-1" fiber_bug.rb:4:in `yield': wrong # of 
arguments(0 for 1) (ArgumentError)
        from fiber_bug.rb:4
        ...internal jruby stack elided...
        from (unknown).yield(fiber_bug.rb:4)
        from (unknown).(unknown)(:1)
        from (unknown).(unknown)(:1)

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