[INFO] cloning repository https://github.com/jonstites/algorithms
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jonstites/algorithms" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjonstites%2Falgorithms", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjonstites%2Falgorithms'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c6aa15346e30e184f4abbc97963fd7333aa066e6
[INFO] testing jonstites/algorithms against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjonstites%2Falgorithms" "/workspace/builds/worker-116/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-116/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jonstites/algorithms on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jonstites/algorithms
[INFO] finished tweaking git repo https://github.com/jonstites/algorithms
[INFO] tweaked toml for git repo https://github.com/jonstites/algorithms written to /workspace/builds/worker-116/source/Cargo.toml
[INFO] crate git repo https://github.com/jonstites/algorithms already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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-116/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-116/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 10ea887d70dd44e356e57814e29130858c590bd4ccd430135b3ccc70485653cb
[INFO] running `Command { std: "docker" "start" "-a" "10ea887d70dd44e356e57814e29130858c590bd4ccd430135b3ccc70485653cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "10ea887d70dd44e356e57814e29130858c590bd4ccd430135b3ccc70485653cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "10ea887d70dd44e356e57814e29130858c590bd4ccd430135b3ccc70485653cb", kill_on_drop: false }`
[INFO] [stdout] 10ea887d70dd44e356e57814e29130858c590bd4ccd430135b3ccc70485653cb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-116/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-116/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5df44d34d2f8d2b7dbbcd610689d8a2c68cf62413335d5efe9802522e28a931d
[INFO] running `Command { std: "docker" "start" "-a" "5df44d34d2f8d2b7dbbcd610689d8a2c68cf62413335d5efe9802522e28a931d", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.58
[INFO] [stderr]    Compiling bitflags v1.1.0
[INFO] [stderr]    Compiling unicode-width v0.1.5
[INFO] [stderr]    Compiling vec_map v0.8.1
[INFO] [stderr]    Compiling strsim v0.8.0
[INFO] [stderr]    Compiling either v1.5.2
[INFO] [stderr]    Compiling ansi_term v0.11.0
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling itertools v0.8.0
[INFO] [stderr]    Compiling atty v0.2.11
[INFO] [stderr]    Compiling clap v2.33.0
[INFO] [stderr]    Compiling algorithms v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::iter`
[INFO] [stdout]    --> src/lib.rs:364:9
[INFO] [stdout]     |
[INFO] [stdout] 364 |     use std::iter;
[INFO] [stdout]     |         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `head`
[INFO] [stdout]    --> src/lib.rs:271:17
[INFO] [stdout]     |
[INFO] [stdout] 271 |             let head = match self.to_head() {
[INFO] [stdout]     |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_head`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `nodes`
[INFO] [stdout]    --> src/data.rs:501:13
[INFO] [stdout]     |
[INFO] [stdout] 501 |             nodes: Vec<T>,
[INFO] [stdout]     |             ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/data.rs:681:20
[INFO] [stdout]     |
[INFO] [stdout] 681 |             pub fn new() -> Trie {
[INFO] [stdout]     |                    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `contains`
[INFO] [stdout]    --> src/data.rs:688:20
[INFO] [stdout]     |
[INFO] [stdout] 688 |             pub fn contains(&self, t: &str) -> bool {
[INFO] [stdout]     |                    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `contains_prefix`
[INFO] [stdout]    --> src/data.rs:696:20
[INFO] [stdout]     |
[INFO] [stdout] 696 |             pub fn contains_prefix(&self, t: &str) -> bool {
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `child_matches`
[INFO] [stdout]    --> src/data.rs:700:16
[INFO] [stdout]     |
[INFO] [stdout] 700 |             fn child_matches(&self, t: &str) -> Option<&Trie> {
[INFO] [stdout]     |                ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add`
[INFO] [stdout]    --> src/data.rs:716:20
[INFO] [stdout]     |
[INFO] [stdout] 716 |             pub fn add(&mut self, values: &str) {
[INFO] [stdout]     |                    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_chars`
[INFO] [stdout]    --> src/data.rs:721:16
[INFO] [stdout]     |
[INFO] [stdout] 721 |             fn add_chars(&mut self, values: &mut Chars) {
[INFO] [stdout]     |                ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_char`
[INFO] [stdout]    --> src/data.rs:731:16
[INFO] [stdout]     |
[INFO] [stdout] 731 |             fn add_char(&mut self, value: char) -> usize {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `set_complete`
[INFO] [stdout]    --> src/data.rs:747:16
[INFO] [stdout]     |
[INFO] [stdout] 747 |             fn set_complete(&mut self) {
[INFO] [stdout]     |                ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/data.rs:58:21
[INFO] [stdout]    |
[INFO] [stdout] 58 |                     std::mem::replace(&mut self.data, data.into_boxed_slice());
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 13.77s
[INFO] running `Command { std: "docker" "inspect" "5df44d34d2f8d2b7dbbcd610689d8a2c68cf62413335d5efe9802522e28a931d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5df44d34d2f8d2b7dbbcd610689d8a2c68cf62413335d5efe9802522e28a931d", kill_on_drop: false }`
[INFO] [stdout] 5df44d34d2f8d2b7dbbcd610689d8a2c68cf62413335d5efe9802522e28a931d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-116/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-116/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5f9683f42e73050a94fe9ecbe99aafab5ae97f50f0219d71a69a4c6273bd05e6
[INFO] running `Command { std: "docker" "start" "-a" "5f9683f42e73050a94fe9ecbe99aafab5ae97f50f0219d71a69a4c6273bd05e6", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling algorithms v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::iter`
[INFO] [stdout]    --> src/lib.rs:364:9
[INFO] [stdout]     |
[INFO] [stdout] 364 |     use std::iter;
[INFO] [stdout]     |         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `head`
[INFO] [stdout]    --> src/lib.rs:271:17
[INFO] [stdout]     |
[INFO] [stdout] 271 |             let head = match self.to_head() {
[INFO] [stdout]     |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_head`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `nodes`
[INFO] [stdout]    --> src/data.rs:501:13
[INFO] [stdout]     |
[INFO] [stdout] 501 |             nodes: Vec<T>,
[INFO] [stdout]     |             ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/data.rs:681:20
[INFO] [stdout]     |
[INFO] [stdout] 681 |             pub fn new() -> Trie {
[INFO] [stdout]     |                    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `contains`
[INFO] [stdout]    --> src/data.rs:688:20
[INFO] [stdout]     |
[INFO] [stdout] 688 |             pub fn contains(&self, t: &str) -> bool {
[INFO] [stdout]     |                    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `contains_prefix`
[INFO] [stdout]    --> src/data.rs:696:20
[INFO] [stdout]     |
[INFO] [stdout] 696 |             pub fn contains_prefix(&self, t: &str) -> bool {
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `child_matches`
[INFO] [stdout]    --> src/data.rs:700:16
[INFO] [stdout]     |
[INFO] [stdout] 700 |             fn child_matches(&self, t: &str) -> Option<&Trie> {
[INFO] [stdout]     |                ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add`
[INFO] [stdout]    --> src/data.rs:716:20
[INFO] [stdout]     |
[INFO] [stdout] 716 |             pub fn add(&mut self, values: &str) {
[INFO] [stdout]     |                    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_chars`
[INFO] [stdout]    --> src/data.rs:721:16
[INFO] [stdout]     |
[INFO] [stdout] 721 |             fn add_chars(&mut self, values: &mut Chars) {
[INFO] [stdout]     |                ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_char`
[INFO] [stdout]    --> src/data.rs:731:16
[INFO] [stdout]     |
[INFO] [stdout] 731 |             fn add_char(&mut self, value: char) -> usize {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `set_complete`
[INFO] [stdout]    --> src/data.rs:747:16
[INFO] [stdout]     |
[INFO] [stdout] 747 |             fn set_complete(&mut self) {
[INFO] [stdout]     |                ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/data.rs:58:21
[INFO] [stdout]    |
[INFO] [stdout] 58 |                     std::mem::replace(&mut self.data, data.into_boxed_slice());
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::iter`
[INFO] [stdout]    --> src/lib.rs:364:9
[INFO] [stdout]     |
[INFO] [stdout] 364 |     use std::iter;
[INFO] [stdout]     |         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `head`
[INFO] [stdout]    --> src/lib.rs:271:17
[INFO] [stdout]     |
[INFO] [stdout] 271 |             let head = match self.to_head() {
[INFO] [stdout]     |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_head`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `nodes`
[INFO] [stdout]    --> src/data.rs:501:13
[INFO] [stdout]     |
[INFO] [stdout] 501 |             nodes: Vec<T>,
[INFO] [stdout]     |             ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/data.rs:58:21
[INFO] [stdout]    |
[INFO] [stdout] 58 |                     std::mem::replace(&mut self.data, data.into_boxed_slice());
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:346:13
[INFO] [stdout]     |
[INFO] [stdout] 346 |             graph.add_edge(a, b);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:351:13
[INFO] [stdout]     |
[INFO] [stdout] 351 |             graph.add_edge(c, d);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:352:13
[INFO] [stdout]     |
[INFO] [stdout] 352 |             graph.add_edge(d, c);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 4.17s
[INFO] running `Command { std: "docker" "inspect" "5f9683f42e73050a94fe9ecbe99aafab5ae97f50f0219d71a69a4c6273bd05e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5f9683f42e73050a94fe9ecbe99aafab5ae97f50f0219d71a69a4c6273bd05e6", kill_on_drop: false }`
[INFO] [stdout] 5f9683f42e73050a94fe9ecbe99aafab5ae97f50f0219d71a69a4c6273bd05e6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-116/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-116/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 48400cc27143512fa8a1ffa78cde6414f26202d087ffef31f7b73fbf344afcbd
[INFO] running `Command { std: "docker" "start" "-a" "48400cc27143512fa8a1ffa78cde6414f26202d087ffef31f7b73fbf344afcbd", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: unused import: `std::iter`
[INFO] [stderr]    --> src/lib.rs:364:9
[INFO] [stderr]     |
[INFO] [stderr] 364 |     use std::iter;
[INFO] [stderr]     |         ^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `head`
[INFO] [stderr]    --> src/lib.rs:271:17
[INFO] [stderr]     |
[INFO] [stderr] 271 |             let head = match self.to_head() {
[INFO] [stderr]     |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_head`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `nodes`
[INFO] [stderr]    --> src/data.rs:501:13
[INFO] [stderr]     |
[INFO] [stderr] 501 |             nodes: Vec<T>,
[INFO] [stderr]     |             ^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]    --> src/data.rs:681:20
[INFO] [stderr]     |
[INFO] [stderr] 681 |             pub fn new() -> Trie {
[INFO] [stderr]     |                    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `contains`
[INFO] [stderr]    --> src/data.rs:688:20
[INFO] [stderr]     |
[INFO] [stderr] 688 |             pub fn contains(&self, t: &str) -> bool {
[INFO] [stderr]     |                    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `contains_prefix`
[INFO] [stderr]    --> src/data.rs:696:20
[INFO] [stderr]     |
[INFO] [stderr] 696 |             pub fn contains_prefix(&self, t: &str) -> bool {
[INFO] [stderr]     |                    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `child_matches`
[INFO] [stderr]    --> src/data.rs:700:16
[INFO] [stderr]     |
[INFO] [stderr] 700 |             fn child_matches(&self, t: &str) -> Option<&Trie> {
[INFO] [stderr]     |                ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `add`
[INFO] [stderr]    --> src/data.rs:716:20
[INFO] [stderr]     |
[INFO] [stderr] 716 |             pub fn add(&mut self, values: &str) {
[INFO] [stderr]     |                    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `add_chars`
[INFO] [stderr]    --> src/data.rs:721:16
[INFO] [stderr]     |
[INFO] [stderr] 721 |             fn add_chars(&mut self, values: &mut Chars) {
[INFO] [stderr]     |                ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `add_char`
[INFO] [stderr]    --> src/data.rs:731:16
[INFO] [stderr]     |
[INFO] [stderr] 731 |             fn add_char(&mut self, value: char) -> usize {
[INFO] [stderr]     |                ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `set_complete`
[INFO] [stderr]    --> src/data.rs:747:16
[INFO] [stderr]     |
[INFO] [stderr] 747 |             fn set_complete(&mut self) {
[INFO] [stderr]     |                ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]   --> src/data.rs:58:21
[INFO] [stderr]    |
[INFO] [stderr] 58 |                     std::mem::replace(&mut self.data, data.into_boxed_slice());
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/lib.rs:346:13
[INFO] [stderr]     |
[INFO] [stderr] 346 |             graph.add_edge(a, b);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/lib.rs:351:13
[INFO] [stderr]     |
[INFO] [stderr] 351 |             graph.add_edge(c, d);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/lib.rs:352:13
[INFO] [stderr]     |
[INFO] [stderr] 352 |             graph.add_edge(d, c);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: `algorithms` (lib) generated 12 warnings
[INFO] [stderr] warning: `algorithms` (lib test) generated 7 warnings (4 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 3.61s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/algorithms-fc65c0018b79e007)
[INFO] [stdout] 
[INFO] [stdout] running 26 tests
[INFO] [stdout] test data::data::hash_set2::tests::test_add_remove ... ok
[INFO] [stdout] test data::data::graph::tests::test_dfs ... ok
[INFO] [stdout] test data::data::graph::tests::test_bfs ... ok
[INFO] [stdout] test data::data::hash_set2::tests::test_clear ... ok
[INFO] [stdout] test data::data::hash_set2::tests::test_contains ... ok
[INFO] [stdout] test data::data::hash_set::tests::test_clear ... ok
[INFO] [stdout] test data::data::stack::tests::test_peek_size_is_empty ... ok
[INFO] [stdout] test data::data::hash_set::tests::test_add_remove ... ok
[INFO] [stdout] test data::data::hash_set::tests::test_contains ... ok
[INFO] [stdout] test data::data::hash_set2::tests::test_is_empty ... ok
[INFO] [stdout] test data::data::trie::tests::test_contains ... ok
[INFO] [stdout] test data::data::stack::tests::test_push_pop ... ok
[INFO] [stdout] test linked_list::tests::test_empty ... ok
[INFO] [stdout] test data::data::hash_set::tests::test_is_empty ... ok
[INFO] [stdout] test linked_list::tests::test_into_iter ... ok
[INFO] [stdout] test linked_list::tests::test_iter ... ok
[INFO] [stdout] test linked_list::tests::test_iter_mut ... ok
[INFO] [stdout] test linked_list::tests::test_peek ... ok
[INFO] [stdout] test linked_list::tests::test_peek_mut ... ok
[INFO] [stdout] test old_graph::tests::test_is_tree ... ok
[INFO] [stdout] test primes::tests::test_sieve_of_eratosthenes_odds ... ok
[INFO] [stdout] test linked_list::tests::test_push_pop ... ok
[INFO] [stdout] test primes::tests::test_sieve_of_eratosthenes_naive ... ok
[INFO] [stdout] test data::data::hash_set::tests::test_benchmarks_tolerable ... ok
[INFO] [stdout] test primes::tests::test_trial_division ... ok
[INFO] [stdout] test data::data::hash_set2::tests::test_benchmarks_tolerable ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 26 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 11.96s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/algorithms-c8bbd857e0d6543f)
[INFO] [stderr]    Doc-tests algorithms
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "48400cc27143512fa8a1ffa78cde6414f26202d087ffef31f7b73fbf344afcbd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "48400cc27143512fa8a1ffa78cde6414f26202d087ffef31f7b73fbf344afcbd", kill_on_drop: false }`
[INFO] [stdout] 48400cc27143512fa8a1ffa78cde6414f26202d087ffef31f7b73fbf344afcbd