[INFO] cloning repository https://github.com/drguildo/dailyprogrammer
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/drguildo/dailyprogrammer" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdrguildo%2Fdailyprogrammer", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdrguildo%2Fdailyprogrammer'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6ac12c97b808cff8f6424bd11af4525e5e3dca02
[INFO] checking drguildo/dailyprogrammer against master#9bfa31f632912180dc742809bcc51a97f2d7079d for pr-140151
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdrguildo%2Fdailyprogrammer" "/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/drguildo/dailyprogrammer on toolchain 9bfa31f632912180dc742809bcc51a97f2d7079d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9bfa31f632912180dc742809bcc51a97f2d7079d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/drguildo/dailyprogrammer
[INFO] finished tweaking git repo https://github.com/drguildo/dailyprogrammer
[INFO] tweaked toml for git repo https://github.com/drguildo/dailyprogrammer written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/drguildo/dailyprogrammer 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" "+9bfa31f632912180dc742809bcc51a97f2d7079d" "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-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+9bfa31f632912180dc742809bcc51a97f2d7079d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6e38cd21d5b407844e1a79ef53bf11e913a86a91ee22a62a6b9820080ac7220d
[INFO] running `Command { std: "docker" "start" "-a" "6e38cd21d5b407844e1a79ef53bf11e913a86a91ee22a62a6b9820080ac7220d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6e38cd21d5b407844e1a79ef53bf11e913a86a91ee22a62a6b9820080ac7220d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6e38cd21d5b407844e1a79ef53bf11e913a86a91ee22a62a6b9820080ac7220d", kill_on_drop: false }`
[INFO] [stdout] 6e38cd21d5b407844e1a79ef53bf11e913a86a91ee22a62a6b9820080ac7220d
[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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+9bfa31f632912180dc742809bcc51a97f2d7079d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] efd32890d459a616acb349d61c86c396a12d63c89fe098f396eb6cd0b6571f86
[INFO] running `Command { std: "docker" "start" "-a" "efd32890d459a616acb349d61c86c396a12d63c89fe098f396eb6cd0b6571f86", kill_on_drop: false }`
[INFO] [stderr]     Checking dailyprogrammer v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `word_to_lettersum`
[INFO] [stdout]    --> examples/challenge_399.rs:116:15
[INFO] [stdout]     |
[INFO] [stdout] 116 | fn optional_5(word_to_lettersum: &HashMap<&str, u32>) {
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_word_to_lettersum`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `word_to_lettersum`
[INFO] [stdout]    --> examples/challenge_399.rs:125:15
[INFO] [stdout]     |
[INFO] [stdout] 125 | fn optional_6(word_to_lettersum: &HashMap<&str, u32>) {
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_word_to_lettersum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `optional_5` is never used
[INFO] [stdout]    --> examples/challenge_399.rs:116:4
[INFO] [stdout]     |
[INFO] [stdout] 116 | fn optional_5(word_to_lettersum: &HashMap<&str, u32>) {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `optional_6` is never used
[INFO] [stdout]    --> examples/challenge_399.rs:125:4
[INFO] [stdout]     |
[INFO] [stdout] 125 | fn optional_6(word_to_lettersum: &HashMap<&str, u32>) {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.12s
[INFO] running `Command { std: "docker" "inspect" "efd32890d459a616acb349d61c86c396a12d63c89fe098f396eb6cd0b6571f86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "efd32890d459a616acb349d61c86c396a12d63c89fe098f396eb6cd0b6571f86", kill_on_drop: false }`
[INFO] [stdout] efd32890d459a616acb349d61c86c396a12d63c89fe098f396eb6cd0b6571f86