IANAL, but precedent says you can use "for Rust" in your description without issue. Though the Rust trademark could still be used to request a removal of associ

IANAL, but precedent says you can use "for Rust" in your description without issue. Though the Rust trademark could still be used to request a removal of association if you were doing something untoward in the eyes of the rust project. So it's not necessarily an unchecked freedom but it's also not limiting in most cases either.