[INFO] cloning repository https://github.com/PrototypeRailGun/SimpleHuffman
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/PrototypeRailGun/SimpleHuffman" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPrototypeRailGun%2FSimpleHuffman", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPrototypeRailGun%2FSimpleHuffman'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 39125c48f340b1e53de22db0dcb7c06c7e51ba6e
[INFO] checking PrototypeRailGun/SimpleHuffman/39125c48f340b1e53de22db0dcb7c06c7e51ba6e against master#0f6e1ae67854c3c44726e8376144c16b465fe7c6 for pr-129392
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPrototypeRailGun%2FSimpleHuffman" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/PrototypeRailGun/SimpleHuffman on toolchain 0f6e1ae67854c3c44726e8376144c16b465fe7c6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0f6e1ae67854c3c44726e8376144c16b465fe7c6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/PrototypeRailGun/SimpleHuffman
[INFO] finished tweaking git repo https://github.com/PrototypeRailGun/SimpleHuffman
[INFO] tweaked toml for git repo https://github.com/PrototypeRailGun/SimpleHuffman written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/PrototypeRailGun/SimpleHuffman 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" "+0f6e1ae67854c3c44726e8376144c16b465fe7c6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+0f6e1ae67854c3c44726e8376144c16b465fe7c6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 12412c75301a4aae234eef53e58cbd1310e9fa6b057853ec03b262514ad38cf6
[INFO] running `Command { std: "docker" "start" "-a" "12412c75301a4aae234eef53e58cbd1310e9fa6b057853ec03b262514ad38cf6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "12412c75301a4aae234eef53e58cbd1310e9fa6b057853ec03b262514ad38cf6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "12412c75301a4aae234eef53e58cbd1310e9fa6b057853ec03b262514ad38cf6", kill_on_drop: false }`
[INFO] [stdout] 12412c75301a4aae234eef53e58cbd1310e9fa6b057853ec03b262514ad38cf6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+0f6e1ae67854c3c44726e8376144c16b465fe7c6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d95715f07e3af5a81b265208338248fd741b9df6805f14d6b94c4237fd5edd42
[INFO] running `Command { std: "docker" "start" "-a" "d95715f07e3af5a81b265208338248fd741b9df6805f14d6b94c4237fd5edd42", kill_on_drop: false }`
[INFO] [stderr]     Checking huffman v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `rootdir` is never read
[INFO] [stdout]  --> src/config.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub struct Config {
[INFO] [stdout]   |            ------ field in this struct
[INFO] [stdout] 9 |     pub rootdir: String,
[INFO] [stdout]   |         ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Config` 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: field `rootdir` is never read
[INFO] [stdout]  --> src/config.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub struct Config {
[INFO] [stdout]   |            ------ field in this struct
[INFO] [stdout] 9 |     pub rootdir: String,
[INFO] [stdout]   |         ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Config` 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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.26s
[INFO] running `Command { std: "docker" "inspect" "d95715f07e3af5a81b265208338248fd741b9df6805f14d6b94c4237fd5edd42", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d95715f07e3af5a81b265208338248fd741b9df6805f14d6b94c4237fd5edd42", kill_on_drop: false }`
[INFO] [stdout] d95715f07e3af5a81b265208338248fd741b9df6805f14d6b94c4237fd5edd42