[INFO] cloning repository https://github.com/peniqliotuv/learning-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/peniqliotuv/learning-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpeniqliotuv%2Flearning-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpeniqliotuv%2Flearning-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1aa7ae42c3950f2cb0374926fb42ae0fed2854ef
[INFO] checking peniqliotuv/learning-rust against beta for pr-78714
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpeniqliotuv%2Flearning-rust" "/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/peniqliotuv/learning-rust on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/peniqliotuv/learning-rust
[INFO] finished tweaking git repo https://github.com/peniqliotuv/learning-rust
[INFO] tweaked toml for git repo https://github.com/peniqliotuv/learning-rust written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/peniqliotuv/learning-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] afe247680ced462bc487af10e9594678812df894380a55741bd96b4ca9692a03
[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" "afe247680ced462bc487af10e9594678812df894380a55741bd96b4ca9692a03", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "afe247680ced462bc487af10e9594678812df894380a55741bd96b4ca9692a03", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "afe247680ced462bc487af10e9594678812df894380a55741bd96b4ca9692a03", kill_on_drop: false }`
[INFO] [stdout] afe247680ced462bc487af10e9594678812df894380a55741bd96b4ca9692a03
[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=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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8743bc71ab47cb0d7595653f31930a2b6d18263d30991d0f4422b87b816cdd84
[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" "8743bc71ab47cb0d7595653f31930a2b6d18263d30991d0f4422b87b816cdd84", kill_on_drop: false }`
[INFO] [stderr]     Checking minigrep v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `file_contents`
[INFO] [stdout]  --> src/lib.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 |   let file_contents = fs::read_to_string(config.filename)?;
[INFO] [stdout]   |       ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_file_contents`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `file_contents`
[INFO] [stdout]  --> src/lib.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 |   let file_contents = fs::read_to_string(config.filename)?;
[INFO] [stdout]   |       ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_file_contents`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[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] [stdout] warning: unused variable: `e`
[INFO] [stdout]  --> src/main.rs:9:51
[INFO] [stdout]   |
[INFO] [stdout] 9 |   let config = Config::new(&args).unwrap_or_else(|e| {
[INFO] [stdout]   |                                                   ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]  --> src/main.rs:9:51
[INFO] [stdout]   |
[INFO] [stdout] 9 |   let config = Config::new(&args).unwrap_or_else(|e| {
[INFO] [stdout]   |                                                   ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[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 1.01s
[INFO] running `Command { std: "docker" "inspect" "8743bc71ab47cb0d7595653f31930a2b6d18263d30991d0f4422b87b816cdd84", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8743bc71ab47cb0d7595653f31930a2b6d18263d30991d0f4422b87b816cdd84", kill_on_drop: false }`
[INFO] [stdout] 8743bc71ab47cb0d7595653f31930a2b6d18263d30991d0f4422b87b816cdd84