[INFO] cloning repository https://github.com/megalypse/rust_collections_exercise
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/megalypse/rust_collections_exercise" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmegalypse%2Frust_collections_exercise", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmegalypse%2Frust_collections_exercise'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c9af602a140cb4262ddb1dbd3792be6c999b669d
[INFO] checking megalypse/rust_collections_exercise against 165655a2f1981fef27b31c547ad7631979fc5139 for pr-160235
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmegalypse%2Frust_collections_exercise" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/megalypse/rust_collections_exercise
[INFO] finished tweaking git repo https://github.com/megalypse/rust_collections_exercise
[INFO] tweaked toml for git repo https://github.com/megalypse/rust_collections_exercise written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/megalypse/rust_collections_exercise on toolchain 165655a2f1981fef27b31c547ad7631979fc5139
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+165655a2f1981fef27b31c547ad7631979fc5139" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/megalypse/rust_collections_exercise 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" "+165655a2f1981fef27b31c547ad7631979fc5139" "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-2-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:00c5645b54fe3ce5dae1417175e3c7fb6a6646c021d554ecd63a097b8b9f3602" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] e1fae373bfd7fd959ce4ea9cc898ac79aeed556db68633237bf19b88fb655740
[INFO] running `Command { std: "docker" "start" "e1fae373bfd7fd959ce4ea9cc898ac79aeed556db68633237bf19b88fb655740", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e1fae373bfd7fd959ce4ea9cc898ac79aeed556db68633237bf19b88fb655740", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "e1fae373bfd7fd959ce4ea9cc898ac79aeed556db68633237bf19b88fb655740" "/opt/rustwide/cargo-home/bin/cargo" "+165655a2f1981fef27b31c547ad7631979fc5139" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e1fae373bfd7fd959ce4ea9cc898ac79aeed556db68633237bf19b88fb655740", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "e1fae373bfd7fd959ce4ea9cc898ac79aeed556db68633237bf19b88fb655740" "/opt/rustwide/cargo-home/bin/cargo" "+165655a2f1981fef27b31c547ad7631979fc5139" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]     Checking ch_8_exercises v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `res` is never read
[INFO] [stdout]   --> src/meds/median.rs:5:19
[INFO] [stdout]    |
[INFO] [stdout]  5 |     let mut res = 0;
[INFO] [stdout]    |                   ^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 11 |         res = vector[(middle.round() as usize) - 1];
[INFO] [stdout]    |         ------------------------------------------- `res` is overwritten here before the previous value is read
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `res` is never read
[INFO] [stdout]   --> src/meds/median.rs:5:19
[INFO] [stdout]    |
[INFO] [stdout]  5 |     let mut res = 0;
[INFO] [stdout]    |                   ^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 11 |         res = vector[(middle.round() as usize) - 1];
[INFO] [stdout]    |         ------------------------------------------- `res` is overwritten here before the previous value is read
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `new_word` is never read
[INFO] [stdout]   --> src/pig_latim/pig_latimner.rs:8:24
[INFO] [stdout]    |
[INFO] [stdout]  8 |     let mut new_word = String::new();
[INFO] [stdout]    |                        ^^^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 15 |         new_word = String::from(word + &hifen + &first_letter + &suffix);
[INFO] [stdout]    |         -------- `new_word` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `new_word` is never read
[INFO] [stdout]   --> src/pig_latim/pig_latimner.rs:8:24
[INFO] [stdout]    |
[INFO] [stdout]  8 |     let mut new_word = String::new();
[INFO] [stdout]    |                        ^^^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 15 |         new_word = String::from(word + &hifen + &first_letter + &suffix);
[INFO] [stdout]    |         -------- `new_word` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.05s
[INFO] running `Command { std: "docker" "inspect" "e1fae373bfd7fd959ce4ea9cc898ac79aeed556db68633237bf19b88fb655740", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e1fae373bfd7fd959ce4ea9cc898ac79aeed556db68633237bf19b88fb655740", kill_on_drop: false }`
[INFO] [stdout] e1fae373bfd7fd959ce4ea9cc898ac79aeed556db68633237bf19b88fb655740
