[INFO] cloning repository https://github.com/wdv4758h/rust_perf_bench
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/wdv4758h/rust_perf_bench" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwdv4758h%2Frust_perf_bench", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwdv4758h%2Frust_perf_bench'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 56f5b231308c25116bd9d3933576355da5ea5835
[INFO] checking wdv4758h/rust_perf_bench against master#d62d3f7fa9a91d933213cc10e20e740608983f64 for pr-77015
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwdv4758h%2Frust_perf_bench" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/wdv4758h/rust_perf_bench on toolchain d62d3f7fa9a91d933213cc10e20e740608983f64
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/wdv4758h/rust_perf_bench
[INFO] finished tweaking git repo https://github.com/wdv4758h/rust_perf_bench
[INFO] tweaked toml for git repo https://github.com/wdv4758h/rust_perf_bench written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/wdv4758h/rust_perf_bench already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] error: the lock file /workspace/builds/worker-4/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a33f65ef02e1c02c7a5a4659d1f2c9f0b3c2664f6abdb65d2d98f7d33bd9f258
[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" "a33f65ef02e1c02c7a5a4659d1f2c9f0b3c2664f6abdb65d2d98f7d33bd9f258", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a33f65ef02e1c02c7a5a4659d1f2c9f0b3c2664f6abdb65d2d98f7d33bd9f258", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a33f65ef02e1c02c7a5a4659d1f2c9f0b3c2664f6abdb65d2d98f7d33bd9f258", kill_on_drop: false }`
[INFO] [stdout] a33f65ef02e1c02c7a5a4659d1f2c9f0b3c2664f6abdb65d2d98f7d33bd9f258
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=forbid" "-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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ef2ce62ecabc01c918be3913e5c877c4889f7ae2f9c1e5d7ba3710132a01c0b7
[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" "ef2ce62ecabc01c918be3913e5c877c4889f7ae2f9c1e5d7ba3710132a01c0b7", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_perf_bench v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]   --> benches/bench.rs:40:26
[INFO] [stdout]    |
[INFO] [stdout] 40 |             .filter(|&x| x < 0)     // always false
[INFO] [stdout]    |                          ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_comparisons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]   --> benches/bench.rs:77:25
[INFO] [stdout]    |
[INFO] [stdout] 77 |             if i > 0 && i < 0 {
[INFO] [stdout]    |                         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.80s
[INFO] running `Command { std: "docker" "inspect" "ef2ce62ecabc01c918be3913e5c877c4889f7ae2f9c1e5d7ba3710132a01c0b7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ef2ce62ecabc01c918be3913e5c877c4889f7ae2f9c1e5d7ba3710132a01c0b7", kill_on_drop: false }`
[INFO] [stdout] ef2ce62ecabc01c918be3913e5c877c4889f7ae2f9c1e5d7ba3710132a01c0b7