[INFO] cloning repository https://github.com/KingAkin/rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/KingAkin/rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKingAkin%2Frust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKingAkin%2Frust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8f240f977699859f59d5220777b981c4b6f8c49b
[INFO] checking KingAkin/rust against try#86f78589b09557f70c9db3f56ad1921e0a9f76ef for pr-138438
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKingAkin%2Frust" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/KingAkin/rust on toolchain 86f78589b09557f70c9db3f56ad1921e0a9f76ef
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+86f78589b09557f70c9db3f56ad1921e0a9f76ef" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/KingAkin/rust
[INFO] finished tweaking git repo https://github.com/KingAkin/rust
[INFO] tweaked toml for git repo https://github.com/KingAkin/rust written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/KingAkin/rust 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" "+86f78589b09557f70c9db3f56ad1921e0a9f76ef" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+86f78589b09557f70c9db3f56ad1921e0a9f76ef" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d60c9c15fd598b371c0ebd0dc0f83ac67a83c5349547d30277dba1fe71f460b8
[INFO] running `Command { std: "docker" "start" "-a" "d60c9c15fd598b371c0ebd0dc0f83ac67a83c5349547d30277dba1fe71f460b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d60c9c15fd598b371c0ebd0dc0f83ac67a83c5349547d30277dba1fe71f460b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d60c9c15fd598b371c0ebd0dc0f83ac67a83c5349547d30277dba1fe71f460b8", kill_on_drop: false }`
[INFO] [stdout] d60c9c15fd598b371c0ebd0dc0f83ac67a83c5349547d30277dba1fe71f460b8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+86f78589b09557f70c9db3f56ad1921e0a9f76ef" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 79f64011ffb20291d7c403c24ce41a7fa7dc5c4f22e4b9f0a4cd66b2c9e3a9e4
[INFO] running `Command { std: "docker" "start" "-a" "79f64011ffb20291d7c403c24ce41a7fa7dc5c4f22e4b9f0a4cd66b2c9e3a9e4", kill_on_drop: false }`
[INFO] [stderr]     Checking my_project_name_lib v0.1.0 (/opt/rustwide/workdir/my_project_name_lib)
[INFO] [stderr]     Checking my_project_name v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `0`, `1`, `2`, and `3` are never read
[INFO] [stdout]   --> src/how_to_hold_data_for_operations/primitives/compound.rs:28:15
[INFO] [stdout]    |
[INFO] [stdout] 28 | struct Matrix(f32, f32, f32, f32);
[INFO] [stdout]    |        ------ ^^^  ^^^  ^^^  ^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        fields in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing these fields
[INFO] [stdout]    = note: `Matrix` 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 `0`, `1`, `2`, and `3` are never read
[INFO] [stdout]   --> src/how_to_hold_data_for_operations/primitives/compound.rs:28:15
[INFO] [stdout]    |
[INFO] [stdout] 28 | struct Matrix(f32, f32, f32, f32);
[INFO] [stdout]    |        ------ ^^^  ^^^  ^^^  ^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        fields in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing these fields
[INFO] [stdout]    = note: `Matrix` 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 0.13s
[INFO] running `Command { std: "docker" "inspect" "79f64011ffb20291d7c403c24ce41a7fa7dc5c4f22e4b9f0a4cd66b2c9e3a9e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "79f64011ffb20291d7c403c24ce41a7fa7dc5c4f22e4b9f0a4cd66b2c9e3a9e4", kill_on_drop: false }`
[INFO] [stdout] 79f64011ffb20291d7c403c24ce41a7fa7dc5c4f22e4b9f0a4cd66b2c9e3a9e4