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class ThrowCatchJump < Exception
attr_reader :_tag, :_val
def initialize(tag, val)
@_tag = tag
@_val = val
super("uncaught throw #{tag.inspect}")
end
end
module Kernel
def catch(tag=Object.new, &block)
block.call(tag)
rescue ThrowCatchJump => e
unless e._tag.equal?(tag)
raise e
end
return e._val
end
def throw(tag, val=nil)
raise ThrowCatchJump.new(tag, val)
end
end
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