[INFO] cloning repository https://github.com/moheed-ali/Rust-Programming-Concepts
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/moheed-ali/Rust-Programming-Concepts" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmoheed-ali%2FRust-Programming-Concepts", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmoheed-ali%2FRust-Programming-Concepts'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 704518c6a50f0e5a24416ca4bb334713f0a993c0
[INFO] checking moheed-ali/Rust-Programming-Concepts against master#8e37e151835d96d6a7415e93e6876561485a3354 for pr-134218
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmoheed-ali%2FRust-Programming-Concepts" "/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/moheed-ali/Rust-Programming-Concepts on toolchain 8e37e151835d96d6a7415e93e6876561485a3354
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8e37e151835d96d6a7415e93e6876561485a3354" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/moheed-ali/Rust-Programming-Concepts
[INFO] finished tweaking git repo https://github.com/moheed-ali/Rust-Programming-Concepts
[INFO] tweaked toml for git repo https://github.com/moheed-ali/Rust-Programming-Concepts written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/moheed-ali/Rust-Programming-Concepts 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" "+8e37e151835d96d6a7415e93e6876561485a3354" "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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+8e37e151835d96d6a7415e93e6876561485a3354" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a59288b978eb89b3ad2d1da5997070caac855f8e52058eda61f38fbc5f0ecedc
[INFO] running `Command { std: "docker" "start" "-a" "a59288b978eb89b3ad2d1da5997070caac855f8e52058eda61f38fbc5f0ecedc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a59288b978eb89b3ad2d1da5997070caac855f8e52058eda61f38fbc5f0ecedc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a59288b978eb89b3ad2d1da5997070caac855f8e52058eda61f38fbc5f0ecedc", kill_on_drop: false }`
[INFO] [stdout] a59288b978eb89b3ad2d1da5997070caac855f8e52058eda61f38fbc5f0ecedc
[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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+8e37e151835d96d6a7415e93e6876561485a3354" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 95359bf2aa0984be3e778f42df8b4a5ba72214dcd2a9becfefbfe1d548d85f5a
[INFO] running `Command { std: "docker" "start" "-a" "95359bf2aa0984be3e778f42df8b4a5ba72214dcd2a9becfefbfe1d548d85f5a", kill_on_drop: false }`
[INFO] [stderr]     Checking variables v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `none`
[INFO] [stdout]   --> src/main.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let none = plus_one(None);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_none`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `none`
[INFO] [stdout]   --> src/main.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let none = plus_one(None);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_none`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.17s
[INFO] running `Command { std: "docker" "inspect" "95359bf2aa0984be3e778f42df8b4a5ba72214dcd2a9becfefbfe1d548d85f5a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "95359bf2aa0984be3e778f42df8b4a5ba72214dcd2a9becfefbfe1d548d85f5a", kill_on_drop: false }`
[INFO] [stdout] 95359bf2aa0984be3e778f42df8b4a5ba72214dcd2a9becfefbfe1d548d85f5a