[INFO] cloning repository https://github.com/mad-s/advent_of_rust_2020
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mad-s/advent_of_rust_2020" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmad-s%2Fadvent_of_rust_2020", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmad-s%2Fadvent_of_rust_2020'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6fe2f0b7db6d558d7d1174687c54e4396bcfea14
[INFO] checking mad-s/advent_of_rust_2020 against master#4ecd70ddd1039a3954056c1071e40278048476fa for pr-137633
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmad-s%2Fadvent_of_rust_2020" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mad-s/advent_of_rust_2020 on toolchain 4ecd70ddd1039a3954056c1071e40278048476fa
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4ecd70ddd1039a3954056c1071e40278048476fa" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mad-s/advent_of_rust_2020
[INFO] finished tweaking git repo https://github.com/mad-s/advent_of_rust_2020
[INFO] tweaked toml for git repo https://github.com/mad-s/advent_of_rust_2020 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/mad-s/advent_of_rust_2020 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" "+4ecd70ddd1039a3954056c1071e40278048476fa" "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-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+4ecd70ddd1039a3954056c1071e40278048476fa" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 720b5e473592114cddf5ba85c39cf311f749f86f194635f148ae7a2a04c26fe6
[INFO] running `Command { std: "docker" "start" "-a" "720b5e473592114cddf5ba85c39cf311f749f86f194635f148ae7a2a04c26fe6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "720b5e473592114cddf5ba85c39cf311f749f86f194635f148ae7a2a04c26fe6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "720b5e473592114cddf5ba85c39cf311f749f86f194635f148ae7a2a04c26fe6", kill_on_drop: false }`
[INFO] [stdout] 720b5e473592114cddf5ba85c39cf311f749f86f194635f148ae7a2a04c26fe6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+4ecd70ddd1039a3954056c1071e40278048476fa" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4856727812a1e92addc704054b6d5b4a3837f931deb5c141b39fcac315b2cd60
[INFO] running `Command { std: "docker" "start" "-a" "4856727812a1e92addc704054b6d5b4a3837f931deb5c141b39fcac315b2cd60", kill_on_drop: false }`
[INFO] [stderr]     Checking advent_of_rust_2020 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `occurrences`
[INFO] [stdout]   --> src/bin/day2.rs:16:13
[INFO] [stdout]    |
[INFO] [stdout] 16 |         let occurrences = password.chars().filter(|&x| x == letter).count();
[INFO] [stdout]    |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_occurrences`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `occurrences`
[INFO] [stdout]   --> src/bin/day2.rs:16:13
[INFO] [stdout]    |
[INFO] [stdout] 16 |         let occurrences = password.chars().filter(|&x| x == letter).count();
[INFO] [stdout]    |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_occurrences`
[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 0.10s
[INFO] running `Command { std: "docker" "inspect" "4856727812a1e92addc704054b6d5b4a3837f931deb5c141b39fcac315b2cd60", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4856727812a1e92addc704054b6d5b4a3837f931deb5c141b39fcac315b2cd60", kill_on_drop: false }`
[INFO] [stdout] 4856727812a1e92addc704054b6d5b4a3837f931deb5c141b39fcac315b2cd60