[INFO] cloning repository https://github.com/jhwagner/rust_by_example_solutions
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jhwagner/rust_by_example_solutions" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjhwagner%2Frust_by_example_solutions", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjhwagner%2Frust_by_example_solutions'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0aa32a7b0d6eca03e6ce044479a9b11f80e49c0c
[INFO] checking jhwagner/rust_by_example_solutions against try#894d32a5432c6a6461bb2aac7c3d5f2e87dce83f for pr-77015
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjhwagner%2Frust_by_example_solutions" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jhwagner/rust_by_example_solutions on toolchain 894d32a5432c6a6461bb2aac7c3d5f2e87dce83f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jhwagner/rust_by_example_solutions
[INFO] finished tweaking git repo https://github.com/jhwagner/rust_by_example_solutions
[INFO] tweaked toml for git repo https://github.com/jhwagner/rust_by_example_solutions written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/jhwagner/rust_by_example_solutions already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7576908f5d2f331e62603119ad1a937af4e1b7b6eb91a60c9c8c6c1862549bc2
[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" "7576908f5d2f331e62603119ad1a937af4e1b7b6eb91a60c9c8c6c1862549bc2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7576908f5d2f331e62603119ad1a937af4e1b7b6eb91a60c9c8c6c1862549bc2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7576908f5d2f331e62603119ad1a937af4e1b7b6eb91a60c9c8c6c1862549bc2", kill_on_drop: false }`
[INFO] [stdout] 7576908f5d2f331e62603119ad1a937af4e1b7b6eb91a60c9c8c6c1862549bc2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0fd5714349e982af320fcd178e635d0de236aec7ac4ca934306fe1b30afcddac
[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" "0fd5714349e982af320fcd178e635d0de236aec7ac4ca934306fe1b30afcddac", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_by_example_solutions v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct is never constructed: `Structure`
[INFO] [stdout]   --> src/bin/1_2_0_formatted_print.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 |     struct Structure(i32);
[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 1.13s
[INFO] running `Command { std: "docker" "inspect" "0fd5714349e982af320fcd178e635d0de236aec7ac4ca934306fe1b30afcddac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0fd5714349e982af320fcd178e635d0de236aec7ac4ca934306fe1b30afcddac", kill_on_drop: false }`
[INFO] [stdout] 0fd5714349e982af320fcd178e635d0de236aec7ac4ca934306fe1b30afcddac