We continue our foray into googletest-rust [1], this time with homegrown matchers.
Our unit tests will now be able to check is_unset() and is_set() for all types that implement ProxiedWithPresence. In practice, this boils down to [u8] and ProtoStr.
Note that we've broken out matchers_upb and matchers_cpp, similar to what was done with aliasing here [2].
[1] https://github.com/google/googletest-rust
[2] 9a0bc392b3 (diff-08e5182ff36ad340a3bfb628995524a2a36a89b59a514ba027b0f25e048dd5c3R90)
PiperOrigin-RevId: 573895179
Bastien Jacot-Guillarmod
Hong Shin