Not sending this as a PR as I assume it's too dirty hack. data_types.rs used can be found at: https://github.com/tafia/quick-protobuf/blob/master/examples/codegen/data_types.rs
time rustfmt --write-mode=display data_types.rs >/dev/null
timings:
real 1m14.506s
real 1m15.186s
real 1m14.968s