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  • Hash : 4fea9cff
    Author : Edward Thomson
    Date : 2016-02-16T13:08:55

    iterator: assert tree_iterator has a frame
    
    Although a `tree_iterator` that failed to be properly created
    does not have a frame, all other `tree_iterator`s should.  Do not
    call `pop` in the failure case, but assert that in all other
    cases there is a frame.