[INFO] cloning repository https://github.com/mwttg/rust-hints-and-tricks
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mwttg/rust-hints-and-tricks" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmwttg%2Frust-hints-and-tricks", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmwttg%2Frust-hints-and-tricks'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1cb2e90031dc2ffbe7f65ef3a51b6e8b01df2fc4
[INFO] testing mwttg/rust-hints-and-tricks against beta-2021-01-01 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmwttg%2Frust-hints-and-tricks" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mwttg/rust-hints-and-tricks on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mwttg/rust-hints-and-tricks
[INFO] finished tweaking git repo https://github.com/mwttg/rust-hints-and-tricks
[INFO] tweaked toml for git repo https://github.com/mwttg/rust-hints-and-tricks written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/mwttg/rust-hints-and-tricks already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 6a6ace564079c29d16ecccb16e9ec80f26b2006d76b4eaab78ab0e5fa5d48474
[INFO] running `Command { std: "docker" "start" "-a" "6a6ace564079c29d16ecccb16e9ec80f26b2006d76b4eaab78ab0e5fa5d48474", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6a6ace564079c29d16ecccb16e9ec80f26b2006d76b4eaab78ab0e5fa5d48474", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6a6ace564079c29d16ecccb16e9ec80f26b2006d76b4eaab78ab0e5fa5d48474", kill_on_drop: false }`
[INFO] [stdout] 6a6ace564079c29d16ecccb16e9ec80f26b2006d76b4eaab78ab0e5fa5d48474
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 98c7ce083625b3b0e3ef20c67c8745476548cc014a94139486c525e1b3a2d211
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "98c7ce083625b3b0e3ef20c67c8745476548cc014a94139486c525e1b3a2d211", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-hints-and-tricks v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.95s
[INFO] running `Command { std: "docker" "inspect" "98c7ce083625b3b0e3ef20c67c8745476548cc014a94139486c525e1b3a2d211", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "98c7ce083625b3b0e3ef20c67c8745476548cc014a94139486c525e1b3a2d211", kill_on_drop: false }`
[INFO] [stdout] 98c7ce083625b3b0e3ef20c67c8745476548cc014a94139486c525e1b3a2d211
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 034453ca594123e64c47dff849abf0520734708aacfb93d6215125c88406d110
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "034453ca594123e64c47dff849abf0520734708aacfb93d6215125c88406d110", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-hints-and-tricks v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.85s
[INFO] running `Command { std: "docker" "inspect" "034453ca594123e64c47dff849abf0520734708aacfb93d6215125c88406d110", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "034453ca594123e64c47dff849abf0520734708aacfb93d6215125c88406d110", kill_on_drop: false }`
[INFO] [stdout] 034453ca594123e64c47dff849abf0520734708aacfb93d6215125c88406d110
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "test" "--frozen", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] ac3730653a37e37050fcdcdd5646dd338fe9871d223a5a6b262121dfc0b1c500
[INFO] running `Command { std: "docker" "start" "-a" "ac3730653a37e37050fcdcdd5646dd338fe9871d223a5a6b262121dfc0b1c500", kill_on_drop: false }`
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/rust_hints_and_tricks-cc9f491c11380875
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test collection::tests::extract_head_and_tail_from_array ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "ac3730653a37e37050fcdcdd5646dd338fe9871d223a5a6b262121dfc0b1c500", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac3730653a37e37050fcdcdd5646dd338fe9871d223a5a6b262121dfc0b1c500", kill_on_drop: false }`
[INFO] [stdout] ac3730653a37e37050fcdcdd5646dd338fe9871d223a5a6b262121dfc0b1c500