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[QUOTE="Gavin Sinclair, post: 4427310"] Since what you want doesn't (to me) intuitively exist, I suggest rewriting it as: def print_line(lineNo, line) should_be(Integer, :lineNo) should_be(String, :line) ... def evaluate_local_variable(var) if local_variables.include? var eval var else raise ArgumentError, "You didn't give me a local variable: #{var}" end end You can probably improve on that, and write it in C, but you get the idea. Cheers, Gavin [/QUOTE]
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