tree e046e44b51e20a19cd4395f597ce45c0e3a391ca
parent 71f65d4a36b6a415019b8068d1af02fa9c7418ba
author Haibo Huang <hhb@google.com> 1589351130 -0700
committer Haibo Huang <hhb@google.com> 1589351130 -0700

Upgrade rust/crates/syn to 1.0.21

Test: None
Change-Id: I888145837945e93d79140c6b398b27d5baffb06c