[INFO] cloning repository https://github.com/Equilibris/rust-hello-huffman
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Equilibris/rust-hello-huffman" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEquilibris%2Frust-hello-huffman", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEquilibris%2Frust-hello-huffman'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 98c95f1581fa8267638352b512116998eb3127c2
[INFO] checking Equilibris/rust-hello-huffman against master#8007b506ac5da629f223b755f5a5391edd5f6d01 for pr-88041
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEquilibris%2Frust-hello-huffman" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Equilibris/rust-hello-huffman on toolchain 8007b506ac5da629f223b755f5a5391edd5f6d01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Equilibris/rust-hello-huffman
[INFO] finished tweaking git repo https://github.com/Equilibris/rust-hello-huffman
[INFO] tweaked toml for git repo https://github.com/Equilibris/rust-hello-huffman written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/Equilibris/rust-hello-huffman already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c7af2bec58f5dad4b84515d6ae19b97f25f3c6afb7a977f2a9f03ec016cff79a
[INFO] running `Command { std: "docker" "start" "-a" "c7af2bec58f5dad4b84515d6ae19b97f25f3c6afb7a977f2a9f03ec016cff79a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c7af2bec58f5dad4b84515d6ae19b97f25f3c6afb7a977f2a9f03ec016cff79a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c7af2bec58f5dad4b84515d6ae19b97f25f3c6afb7a977f2a9f03ec016cff79a", kill_on_drop: false }`
[INFO] [stdout] c7af2bec58f5dad4b84515d6ae19b97f25f3c6afb7a977f2a9f03ec016cff79a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 72eb93f9e3298e99625fccb5b94f52c2e8fb9f6d603c04b0bf7079b9e90c2ad5
[INFO] running `Command { std: "docker" "start" "-a" "72eb93f9e3298e99625fccb5b94f52c2e8fb9f6d603c04b0bf7079b9e90c2ad5", kill_on_drop: false }`
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]    Compiling priority-queue v1.1.1
[INFO] [stderr]     Checking itertools v0.10.1
[INFO] [stderr]     Checking huffman v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `itertools::Itertools`
[INFO] [stdout]    --> src/huff_encoder.rs:194:13
[INFO] [stdout]     |
[INFO] [stdout] 194 |         use itertools::Itertools;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]    --> src/huff_encoder.rs:196:9
[INFO] [stdout]     |
[INFO] [stdout] 192 |         todo!();
[INFO] [stdout]     |         -------- any code following this expression is unreachable
[INFO] [stdout] ...
[INFO] [stdout] 196 |         let test_string: String = String::from(test_str);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `queue`
[INFO] [stdout]    --> src/huff_encoder.rs:200:17
[INFO] [stdout]     |
[INFO] [stdout] 200 |         let mut queue = build_queue(frequencies);
[INFO] [stdout]     |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_queue`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `it_builds_the_optimal_queue`
[INFO] [stdout]    --> src/huff_encoder.rs:191:8
[INFO] [stdout]     |
[INFO] [stdout] 191 |     fn it_builds_the_optimal_queue() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `test_str` should have an upper case name
[INFO] [stdout]    --> src/huff_encoder.rs:155:11
[INFO] [stdout]     |
[INFO] [stdout] 155 |     const test_str: &str = "Lorem ipsum dolor sit amet, consectetur adipiscing elit.";
[INFO] [stdout]     |           ^^^^^^^^ help: convert the identifier to upper case: `TEST_STR`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.00s
[INFO] running `Command { std: "docker" "inspect" "72eb93f9e3298e99625fccb5b94f52c2e8fb9f6d603c04b0bf7079b9e90c2ad5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "72eb93f9e3298e99625fccb5b94f52c2e8fb9f6d603c04b0bf7079b9e90c2ad5", kill_on_drop: false }`
[INFO] [stdout] 72eb93f9e3298e99625fccb5b94f52c2e8fb9f6d603c04b0bf7079b9e90c2ad5