Really? What do you think comes from Ruby? Rust mostly seems to be inspired by ML and C++.

Actually I just checked the "official" list and they only list the closure syntax which seems pretty minor:

https://doc.rust-lang.org/reference/influences.html

Iterator style, chaining, traits, blocks all feel very rubyesque, and expression syntax as well, plus the cargo toolchain is very bundler-informed.

Expression orientation