[INFO] cloning repository https://github.com/zengol/exercise_ref_4
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/zengol/exercise_ref_4" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzengol%2Fexercise_ref_4", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzengol%2Fexercise_ref_4'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ca7ab3a85f2c54e3178d025431804cbb0b97a577
[INFO] checking zengol/exercise_ref_4 against try#802c9b5f98c16ec9d24cdfd517f740f1f3df0e29 for pr-137728
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzengol%2Fexercise_ref_4" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/zengol/exercise_ref_4 on toolchain 802c9b5f98c16ec9d24cdfd517f740f1f3df0e29
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+802c9b5f98c16ec9d24cdfd517f740f1f3df0e29" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/zengol/exercise_ref_4
[INFO] finished tweaking git repo https://github.com/zengol/exercise_ref_4
[INFO] tweaked toml for git repo https://github.com/zengol/exercise_ref_4 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/zengol/exercise_ref_4 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+802c9b5f98c16ec9d24cdfd517f740f1f3df0e29" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+802c9b5f98c16ec9d24cdfd517f740f1f3df0e29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 19947a9e41e2dbe171df3630c2c4d19628808dff029c303d4c96e3bf1873124a
[INFO] running `Command { std: "docker" "start" "-a" "19947a9e41e2dbe171df3630c2c4d19628808dff029c303d4c96e3bf1873124a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "19947a9e41e2dbe171df3630c2c4d19628808dff029c303d4c96e3bf1873124a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "19947a9e41e2dbe171df3630c2c4d19628808dff029c303d4c96e3bf1873124a", kill_on_drop: false }`
[INFO] [stdout] 19947a9e41e2dbe171df3630c2c4d19628808dff029c303d4c96e3bf1873124a
[INFO] checking zengol/exercise_ref_4 against try#802c9b5f98c16ec9d24cdfd517f740f1f3df0e29 for pr-137728
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzengol%2Fexercise_ref_4" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/zengol/exercise_ref_4 on toolchain 802c9b5f98c16ec9d24cdfd517f740f1f3df0e29
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+802c9b5f98c16ec9d24cdfd517f740f1f3df0e29" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/zengol/exercise_ref_4
[INFO] finished tweaking git repo https://github.com/zengol/exercise_ref_4
[INFO] tweaked toml for git repo https://github.com/zengol/exercise_ref_4 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/zengol/exercise_ref_4 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+802c9b5f98c16ec9d24cdfd517f740f1f3df0e29" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+802c9b5f98c16ec9d24cdfd517f740f1f3df0e29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 52d8e8c5e82728dfd6cf0da668044ee9e9e9409b20843f39ea0606e6c2844be3
[INFO] running `Command { std: "docker" "start" "-a" "52d8e8c5e82728dfd6cf0da668044ee9e9e9409b20843f39ea0606e6c2844be3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "52d8e8c5e82728dfd6cf0da668044ee9e9e9409b20843f39ea0606e6c2844be3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "52d8e8c5e82728dfd6cf0da668044ee9e9e9409b20843f39ea0606e6c2844be3", kill_on_drop: false }`
[INFO] [stdout] 52d8e8c5e82728dfd6cf0da668044ee9e9e9409b20843f39ea0606e6c2844be3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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" "RUSTDOCFLAGS=--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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+802c9b5f98c16ec9d24cdfd517f740f1f3df0e29" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 20aa8b13425b3699dcdb18801c3c4c6ab2cf6b692b626d54a79d3519f31a7fcd
[INFO] running `Command { std: "docker" "start" "-a" "20aa8b13425b3699dcdb18801c3c4c6ab2cf6b692b626d54a79d3519f31a7fcd", kill_on_drop: false }`
[INFO] [stderr]     Checking exercise_ref_4 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `id`, `balance`, and `holder` are never read
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Account {
[INFO] [stdout]   |        ------- fields in this struct
[INFO] [stdout] 3 |     id: u32,
[INFO] [stdout]   |     ^^
[INFO] [stdout] 4 |     balance: i32,
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 5 |     holder: String,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Account` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `id`, `balance`, and `holder` are never read
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Account {
[INFO] [stdout]   |        ------- fields in this struct
[INFO] [stdout] 3 |     id: u32,
[INFO] [stdout]   |     ^^
[INFO] [stdout] 4 |     balance: i32,
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 5 |     holder: String,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Account` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.09s
[INFO] running `Command { std: "docker" "inspect" "20aa8b13425b3699dcdb18801c3c4c6ab2cf6b692b626d54a79d3519f31a7fcd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "20aa8b13425b3699dcdb18801c3c4c6ab2cf6b692b626d54a79d3519f31a7fcd", kill_on_drop: false }`
[INFO] [stdout] 20aa8b13425b3699dcdb18801c3c4c6ab2cf6b692b626d54a79d3519f31a7fcd