[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 1.49.0 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-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mwttg/rust-hints-and-tricks on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "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-6/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" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+1.49.0" "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] 1e09a985b8e57603a9e53bfc62193040cec6d16da8e65c363a4221a371744bf4
[INFO] running `Command { std: "docker" "start" "-a" "1e09a985b8e57603a9e53bfc62193040cec6d16da8e65c363a4221a371744bf4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1e09a985b8e57603a9e53bfc62193040cec6d16da8e65c363a4221a371744bf4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e09a985b8e57603a9e53bfc62193040cec6d16da8e65c363a4221a371744bf4", kill_on_drop: false }`
[INFO] [stdout] 1e09a985b8e57603a9e53bfc62193040cec6d16da8e65c363a4221a371744bf4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0731de7efab51a071d276afcaee9a7b15fe0cb5731dde3a7141e3f1cdaf1523c
[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" "0731de7efab51a071d276afcaee9a7b15fe0cb5731dde3a7141e3f1cdaf1523c", 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 0.93s
[INFO] running `Command { std: "docker" "inspect" "0731de7efab51a071d276afcaee9a7b15fe0cb5731dde3a7141e3f1cdaf1523c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0731de7efab51a071d276afcaee9a7b15fe0cb5731dde3a7141e3f1cdaf1523c", kill_on_drop: false }`
[INFO] [stdout] 0731de7efab51a071d276afcaee9a7b15fe0cb5731dde3a7141e3f1cdaf1523c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+1.49.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7c0c68ed5bcced342598974b7153db9af4080043b51775a4fea8bc63d39b3c62
[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" "7c0c68ed5bcced342598974b7153db9af4080043b51775a4fea8bc63d39b3c62", 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 0.91s
[INFO] running `Command { std: "docker" "inspect" "7c0c68ed5bcced342598974b7153db9af4080043b51775a4fea8bc63d39b3c62", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7c0c68ed5bcced342598974b7153db9af4080043b51775a4fea8bc63d39b3c62", kill_on_drop: false }`
[INFO] [stdout] 7c0c68ed5bcced342598974b7153db9af4080043b51775a4fea8bc63d39b3c62
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+1.49.0" "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] b7c94ef51beaf0596c8de233f0eda8c7597c384cb036aebfc4d00390558fe635
[INFO] running `Command { std: "docker" "start" "-a" "b7c94ef51beaf0596c8de233f0eda8c7597c384cb036aebfc4d00390558fe635", kill_on_drop: false }`
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/rust_hints_and_tricks-715afcd4f31415e2
[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
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "b7c94ef51beaf0596c8de233f0eda8c7597c384cb036aebfc4d00390558fe635", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b7c94ef51beaf0596c8de233f0eda8c7597c384cb036aebfc4d00390558fe635", kill_on_drop: false }`
[INFO] [stdout] b7c94ef51beaf0596c8de233f0eda8c7597c384cb036aebfc4d00390558fe635