[INFO] cloning repository https://github.com/brinchj/rustfest-fastware
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/brinchj/rustfest-fastware" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbrinchj%2Frustfest-fastware", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbrinchj%2Frustfest-fastware'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4fc8894a9efddf3a679558b3ef32fb997dbd4772
[INFO] checking brinchj/rustfest-fastware against master#d62d3f7fa9a91d933213cc10e20e740608983f64 for pr-77015
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbrinchj%2Frustfest-fastware" "/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/brinchj/rustfest-fastware 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/brinchj/rustfest-fastware
[INFO] finished tweaking git repo https://github.com/brinchj/rustfest-fastware
[INFO] tweaked toml for git repo https://github.com/brinchj/rustfest-fastware written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/brinchj/rustfest-fastware 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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] 37ed0a7b73e833b21fb71378a74494b8afd564276ada98b2cf562ad11cb5f01c
[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" "37ed0a7b73e833b21fb71378a74494b8afd564276ada98b2cf562ad11cb5f01c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "37ed0a7b73e833b21fb71378a74494b8afd564276ada98b2cf562ad11cb5f01c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "37ed0a7b73e833b21fb71378a74494b8afd564276ada98b2cf562ad11cb5f01c", kill_on_drop: false }`
[INFO] [stdout] 37ed0a7b73e833b21fb71378a74494b8afd564276ada98b2cf562ad11cb5f01c
[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] 29fef9fbaac4ccc12f8b429329f83d59e841ba0bb5436f4fd90fc022de65193c
[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" "29fef9fbaac4ccc12f8b429329f83d59e841ba0bb5436f4fd90fc022de65193c", kill_on_drop: false }`
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking libc v0.2.40
[INFO] [stderr]     Checking either v1.5.0
[INFO] [stderr]     Checking byteorder v1.2.2
[INFO] [stderr]     Checking unreachable v1.0.0
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]     Checking memchr v2.0.1
[INFO] [stderr]     Checking combine v3.2.0
[INFO] [stderr]    Compiling rustc_version v0.2.2
[INFO] [stderr]    Compiling im v10.2.0
[INFO] [stderr]     Checking rustfest v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/lib.rs:387:17
[INFO] [stdout]     |
[INFO] [stdout] 387 |                 black_box(eval(&line, &mut env));
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 15.92s
[INFO] running `Command { std: "docker" "inspect" "29fef9fbaac4ccc12f8b429329f83d59e841ba0bb5436f4fd90fc022de65193c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "29fef9fbaac4ccc12f8b429329f83d59e841ba0bb5436f4fd90fc022de65193c", kill_on_drop: false }`
[INFO] [stdout] 29fef9fbaac4ccc12f8b429329f83d59e841ba0bb5436f4fd90fc022de65193c