Marc Horowitz 50caf4e809 Change the default guard behavior to throw the exception
Differential Revision: D3428928

fbshipit-source-id: 7847d7fac6a2dc1e4c58dfd5f97feea97ba58930
2016-06-14 16:28:46 -07:00
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2016-04-11 14:38:26 -07:00