Comment by steveklabnik

> What are the chances there isn't a backdoor?

mrustc, an independent implementation, has produced identical output.

> rustc bootstrap tested and validated (1.19.0 isn't fully repeatable, but later versions are)

https://github.com/thepowersgang/mrustc?tab=readme-ov-file#p...

This means you'd have to land the same attack in both mrustc and rustc, making the possibility infinitesimally small.