tree bbc44fe97a9655c8b820eea5ff7409db814b19bf
parent 3dcfbd329bb719a4b9a76be9dc86982c412731e4
author nglevin <nglevin@google.com> 1522355091 -0400
committer kelvinchan-google <kelvinchan@google.com> 1522964609 -0400

Migrate to Swift 4 slicing subscripts.

Addresses the last of the Swift 4 warnings, short of Swift 4.1.

PiperOrigin-RevId: 190976619