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Kornel is also behind the DSSIM library (in Rust), which I've found useful for comparing images before and after compression.
https://github.com/kornelski/dssim
Java could have been a good example, but Sun had a rather strict validation process for calling something Java.
Furthermore, there are big difference in philosophy with C:
1. IB and UB are not considered normal parts of specifications, meaning there's way less opportunity for originality in the interpretation of the specifications
2. there tends to be an ur-implementation, and notable divergences from that tends to be interpreted as either a bug in the other implementation(s) or a lack of specification to be resolved between all implementations
Rust only has UB in unsafe (AFAIK), which greatly limits implementation flexibility in terms of observable behaviour; and the reference implementation would very much be considered the reference implementation, so I expect e.g. rust-gcc will be sticking close to the reference implementation and behavioural divergence will either be fixed to match, or will lead to more precise specification and both implementations converging.
Probably eventually with, if not a Sun-style validation suite, a Ruby-style Spec Suite (https://github.com/ruby/spec).