[INFO] cloning repository https://github.com/edzdez/letterboxed-solver
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/edzdez/letterboxed-solver" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fedzdez%2Fletterboxed-solver", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fedzdez%2Fletterboxed-solver'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 743733d77b2c38709488942059cc2b6f9eb6ea9e
[INFO] checking edzdez/letterboxed-solver against master#d14d202262d13df896b0c624b0cec6e4bfde631a for pr-143028
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fedzdez%2Fletterboxed-solver" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/edzdez/letterboxed-solver
[INFO] finished tweaking git repo https://github.com/edzdez/letterboxed-solver
[INFO] tweaked toml for git repo https://github.com/edzdez/letterboxed-solver written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/edzdez/letterboxed-solver on toolchain d14d202262d13df896b0c624b0cec6e4bfde631a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d14d202262d13df896b0c624b0cec6e4bfde631a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/edzdez/letterboxed-solver 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" "+d14d202262d13df896b0c624b0cec6e4bfde631a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+d14d202262d13df896b0c624b0cec6e4bfde631a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6a5fd6614a5696175e130965716b133e10d1953c5f81bb8a8912a34799e81cc1
[INFO] running `Command { std: "docker" "start" "-a" "6a5fd6614a5696175e130965716b133e10d1953c5f81bb8a8912a34799e81cc1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6a5fd6614a5696175e130965716b133e10d1953c5f81bb8a8912a34799e81cc1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6a5fd6614a5696175e130965716b133e10d1953c5f81bb8a8912a34799e81cc1", kill_on_drop: false }`
[INFO] [stdout] 6a5fd6614a5696175e130965716b133e10d1953c5f81bb8a8912a34799e81cc1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+d14d202262d13df896b0c624b0cec6e4bfde631a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c9c6a88b1471c9db393b8faa2c2a96fbeee6c4bf3ad3d8e85b3bbf635ac53042
[INFO] running `Command { std: "docker" "start" "-a" "c9c6a88b1471c9db393b8faa2c2a96fbeee6c4bf3ad3d8e85b3bbf635ac53042", kill_on_drop: false }`
[INFO] [stderr]     Checking letter-boxed-solver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `letters` is never read
[INFO] [stdout]   --> src/main.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 8  | pub struct LetterBox {
[INFO] [stdout]    |            --------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 13 |     letters: HashSet<char>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `contains_word` is never used
[INFO] [stdout]   --> src/trie.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 8  | impl Trie {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 27 |     pub fn contains_word(&self, s: String) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]   --> src/trie.rs:83:5
[INFO] [stdout]    |
[INFO] [stdout] 82 | pub struct TrieNode {
[INFO] [stdout]    |            -------- field in this struct
[INFO] [stdout] 83 |     value: Option<char>,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `contains_char` is never used
[INFO] [stdout]   --> src/trie.rs:97:12
[INFO] [stdout]    |
[INFO] [stdout] 88 | impl TrieNode {
[INFO] [stdout]    | ------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 97 |     pub fn contains_char(&self, c: char) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `letters` is never read
[INFO] [stdout]   --> src/main.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 8  | pub struct LetterBox {
[INFO] [stdout]    |            --------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 13 |     letters: HashSet<char>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]   --> src/trie.rs:83:5
[INFO] [stdout]    |
[INFO] [stdout] 82 | pub struct TrieNode {
[INFO] [stdout]    |            -------- field in this struct
[INFO] [stdout] 83 |     value: Option<char>,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `contains_char` is never used
[INFO] [stdout]   --> src/trie.rs:97:12
[INFO] [stdout]    |
[INFO] [stdout] 88 | impl TrieNode {
[INFO] [stdout]    | ------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 97 |     pub fn contains_char(&self, c: char) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.30s
[INFO] running `Command { std: "docker" "inspect" "c9c6a88b1471c9db393b8faa2c2a96fbeee6c4bf3ad3d8e85b3bbf635ac53042", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c9c6a88b1471c9db393b8faa2c2a96fbeee6c4bf3ad3d8e85b3bbf635ac53042", kill_on_drop: false }`
[INFO] [stdout] c9c6a88b1471c9db393b8faa2c2a96fbeee6c4bf3ad3d8e85b3bbf635ac53042