right now, there's only one symlink available: /usr/bin/rustfmt-bin-1.35.0 which should be complemented by /usr/bin/rustfmt same for cargo-fmt, only /usr/bin/cargo-fmt-bin-1.35.0 is available, but in addition it should have /usr/bin/cargo-fmt
run eselect-rust again, symlinks will be created. it's known bug, I'll get to it later. *** This bug has been marked as a duplicate of bug 688864 ***