address them: jdm@pathfinder servo % git push origin issue-12345 Enumerating objects: 43, done. Counting objects: 100% (43/43), done. Delta compression using up to 12 threads Compressing objects: 100% "/path/to/servo" && "cargo" "metadata" "--format-version" "1" "-- manifest-path" "/path/to/servo/Cargo.toml" "--filter-platform" "x86_64-unknown-linux-gnu"`: `cargo metadata` exited with an error: error: could not execute println! , log adds a timestamp and tells you where the message came from: You can use RUST_LOG to filter the output of log by level ( off , error , warn , info , debug , trace ) and/or by where the message