There are several unstable Cargo features without an RFC that we would like help in testing. As there is no documented process without an RFC, I figured I'd create an issue here

rust-lang/cargo#11123: cargo install --dry-run

• Instructions: cargo install --dry-run cargo#11123 (comment)

rust-lang/cargo#14520: native completions for cargo

• Instructions: https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#native-completions