fx update-rustc-third-party

更新 rustc_library 和 rustc_binary 第三方依赖项

usage: fx update-rustc-third-party
Updates third_party/rust_crates based on the contents of
third_party/rust_crates/Cargo.toml

See https://fuchsia.dev/fuchsia-src/development/languages/rust/third_party.md
for more details.

update-rustc-third-party source code