folly: ubsan: &v[0] is undefined if v.empty()
Summary: before: [ RUN ] RangeFunc.Vector bits/stl_vector.h:866:9: runtime error: reference binding to null pointer of type 'int' Reviewed By: yfeldblum Differential Revision: D3279253 fbshipit-source-id: 957a8ec050f5c3b27febf7e6cd16ad1d307da169
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