[INFO] cloning repository https://github.com/ForrestHilton/cs401_rust_linked_list [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ForrestHilton/cs401_rust_linked_list" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FForrestHilton%2Fcs401_rust_linked_list", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FForrestHilton%2Fcs401_rust_linked_list'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 71adc7322b49d744d37e70be015450a88b1cb468 [INFO] checking ForrestHilton/cs401_rust_linked_list against master#1f12b9b0fdbe735968ac002792a720f0ba4faca6 for crater-rollup-uwu [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FForrestHilton%2Fcs401_rust_linked_list" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/ForrestHilton/cs401_rust_linked_list on toolchain 1f12b9b0fdbe735968ac002792a720f0ba4faca6 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/ForrestHilton/cs401_rust_linked_list [INFO] finished tweaking git repo https://github.com/ForrestHilton/cs401_rust_linked_list [INFO] tweaked toml for git repo https://github.com/ForrestHilton/cs401_rust_linked_list written to /workspace/builds/worker-4-tc1/source/Cargo.toml [INFO] crate git repo https://github.com/ForrestHilton/cs401_rust_linked_list 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" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] e021e9095f51f6beaa85132c5005e4b4ba7f11828e7d657cdf3c68b5b346575b [INFO] running `Command { std: "docker" "start" "-a" "e021e9095f51f6beaa85132c5005e4b4ba7f11828e7d657cdf3c68b5b346575b", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "e021e9095f51f6beaa85132c5005e4b4ba7f11828e7d657cdf3c68b5b346575b", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "e021e9095f51f6beaa85132c5005e4b4ba7f11828e7d657cdf3c68b5b346575b", kill_on_drop: false }` [INFO] [stdout] e021e9095f51f6beaa85132c5005e4b4ba7f11828e7d657cdf3c68b5b346575b [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] b4e470dbd8c2a4cba8ffbff51b1626adf472f88d898a39bae6aeb05ef276dcae [INFO] running `Command { std: "docker" "start" "-a" "b4e470dbd8c2a4cba8ffbff51b1626adf472f88d898a39bae6aeb05ef276dcae", kill_on_drop: false }` [INFO] [stderr] Checking cs401_rust_linked_list v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: methods `len` and `dropfront` are never used [INFO] [stdout] --> src/main.rs:20:8 [INFO] [stdout] | [INFO] [stdout] 15 | impl List { [INFO] [stdout] | ---------------------- methods in this implementation [INFO] [stdout] ... [INFO] [stdout] 20 | fn len(&self) -> i32 { [INFO] [stdout] | ^^^ [INFO] [stdout] ... [INFO] [stdout] 36 | fn dropfront(&self, n: usize) -> Self { [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: methods `len` and `dropfront` are never used [INFO] [stdout] --> src/main.rs:20:8 [INFO] [stdout] | [INFO] [stdout] 15 | impl List { [INFO] [stdout] | ---------------------- methods in this implementation [INFO] [stdout] ... [INFO] [stdout] 20 | fn len(&self) -> i32 { [INFO] [stdout] | ^^^ [INFO] [stdout] ... [INFO] [stdout] 36 | fn dropfront(&self, n: usize) -> Self { [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] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.05s [INFO] running `Command { std: "docker" "inspect" "b4e470dbd8c2a4cba8ffbff51b1626adf472f88d898a39bae6aeb05ef276dcae", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "b4e470dbd8c2a4cba8ffbff51b1626adf472f88d898a39bae6aeb05ef276dcae", kill_on_drop: false }` [INFO] [stdout] b4e470dbd8c2a4cba8ffbff51b1626adf472f88d898a39bae6aeb05ef276dcae