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ref: 8aa062755760b61f9131a0411e9125bafddc0a4f parent: 3c58fa90c8fd063c7ccb00a85a7e238ae2788a73 author: Tor Andersson <tor@ccxvii.net> date: Sun Jan 19 19:13:47 EST 2014
Add Error builtin objects and exception stack.