[INFO] cloning repository https://github.com/kornysietsma/rust-101-sample
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kornysietsma/rust-101-sample" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkornysietsma%2Frust-101-sample", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkornysietsma%2Frust-101-sample'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3ec0de9a0f0000030a27e4e73bbd7ada9059fc82
[INFO] checking kornysietsma/rust-101-sample against master#39b841dfe36f90a7cd111e7f0c55f32594f6e578 for pr-77035
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkornysietsma%2Frust-101-sample" "/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/kornysietsma/rust-101-sample on toolchain 39b841dfe36f90a7cd111e7f0c55f32594f6e578
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kornysietsma/rust-101-sample
[INFO] finished tweaking git repo https://github.com/kornysietsma/rust-101-sample
[INFO] tweaked toml for git repo https://github.com/kornysietsma/rust-101-sample written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/kornysietsma/rust-101-sample already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e1eba18dc988677231d623e733eb0fd33a4425c1d5b200915f6cfb5099600784
[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" "e1eba18dc988677231d623e733eb0fd33a4425c1d5b200915f6cfb5099600784", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e1eba18dc988677231d623e733eb0fd33a4425c1d5b200915f6cfb5099600784", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e1eba18dc988677231d623e733eb0fd33a4425c1d5b200915f6cfb5099600784", kill_on_drop: false }`
[INFO] [stdout] e1eba18dc988677231d623e733eb0fd33a4425c1d5b200915f6cfb5099600784
[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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 22f44429e2796a5da72951df841dd69dbe0721c30aa1d8ecc2b14d33d7b9bb2f
[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" "22f44429e2796a5da72951df841dd69dbe0721c30aa1d8ecc2b14d33d7b9bb2f", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v0.15.43
[INFO] [stderr]    Compiling libc v0.2.60
[INFO] [stderr]    Compiling cc v1.0.38
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]     Checking rustc-demangle v0.1.15
[INFO] [stderr]     Checking difference v2.0.0
[INFO] [stderr]     Checking log v0.4.8
[INFO] [stderr]     Checking pretty_assertions v0.6.1
[INFO] [stderr]    Compiling backtrace-sys v0.1.31
[INFO] [stderr]     Checking backtrace v0.3.34
[INFO] [stderr]    Compiling synstructure v0.10.2
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]     Checking failure v0.1.5
[INFO] [stderr]     Checking rust_101 v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `fib`
[INFO] [stdout]  --> src/step_1_fibs.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn fib(n: u32) -> u128 {
[INFO] [stdout]   |    ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 36.20s
[INFO] running `Command { std: "docker" "inspect" "22f44429e2796a5da72951df841dd69dbe0721c30aa1d8ecc2b14d33d7b9bb2f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "22f44429e2796a5da72951df841dd69dbe0721c30aa1d8ecc2b14d33d7b9bb2f", kill_on_drop: false }`
[INFO] [stdout] 22f44429e2796a5da72951df841dd69dbe0721c30aa1d8ecc2b14d33d7b9bb2f