Gavin Sharp 0b4382a756 Bug 866748: isTopLevel shouldn't throw, r=smaug
--HG--
extra : transplant_source : %FDZ%DE6%3Bw%A7%CD%C7%A2%5D%60%7F%B7%2C%92F5%88%08
2013-04-29 15:52:57 -07:00
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