[INFO] cloning repository https://github.com/proctorlabs/gtk-rs-macros
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/proctorlabs/gtk-rs-macros" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fproctorlabs%2Fgtk-rs-macros"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fproctorlabs%2Fgtk-rs-macros'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 816cbdba75de022721ddd5dc7e02ecf58daa665b
[ERROR] this task or one of its parent failed!
[ERROR] command `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` failed
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.