[INFO] cloning repository https://github.com/souravgopal25/rust_basics
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/souravgopal25/rust_basics" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsouravgopal25%2Frust_basics", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsouravgopal25%2Frust_basics'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6aebd1db92ec75fdbef055e4c498032665ebdd7e
[INFO] checking souravgopal25/rust_basics against master#4fa76a4a7742bb9c1febe33019f5a9e7e4839a65 for pr-83744
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsouravgopal25%2Frust_basics" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/souravgopal25/rust_basics on toolchain 4fa76a4a7742bb9c1febe33019f5a9e7e4839a65
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/souravgopal25/rust_basics
[INFO] finished tweaking git repo https://github.com/souravgopal25/rust_basics
[INFO] tweaked toml for git repo https://github.com/souravgopal25/rust_basics written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/souravgopal25/rust_basics already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "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] 77b9acae3f64ad89842dd523ff7c4f455368f85d64aff39a1570da8abc3dc416
[INFO] running `Command { std: "docker" "start" "-a" "77b9acae3f64ad89842dd523ff7c4f455368f85d64aff39a1570da8abc3dc416", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "77b9acae3f64ad89842dd523ff7c4f455368f85d64aff39a1570da8abc3dc416", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "77b9acae3f64ad89842dd523ff7c4f455368f85d64aff39a1570da8abc3dc416", kill_on_drop: false }`
[INFO] [stdout] 77b9acae3f64ad89842dd523ff7c4f455368f85d64aff39a1570da8abc3dc416
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7ba47e2cb4faf229a2bcfdc031a1e556ae8ed938bf935d906be9c74d75b4869f
[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" "7ba47e2cb4faf229a2bcfdc031a1e556ae8ed938bf935d906be9c74d75b4869f", kill_on_drop: false }`
[INFO] [stderr]     Checking RUST_SANDBOX v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: crate `RUST_SANDBOX` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout]   = help: convert the identifier to snake case: `rust_sandbox`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate `RUST_SANDBOX` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout]   = help: convert the identifier to snake case: `rust_sandbox`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.20s
[INFO] running `Command { std: "docker" "inspect" "7ba47e2cb4faf229a2bcfdc031a1e556ae8ed938bf935d906be9c74d75b4869f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7ba47e2cb4faf229a2bcfdc031a1e556ae8ed938bf935d906be9c74d75b4869f", kill_on_drop: false }`
[INFO] [stdout] 7ba47e2cb4faf229a2bcfdc031a1e556ae8ed938bf935d906be9c74d75b4869f