[INFO] cloning repository https://github.com/willowell/classic_computer_science_problems_in_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/willowell/classic_computer_science_problems_in_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwillowell%2Fclassic_computer_science_problems_in_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwillowell%2Fclassic_computer_science_problems_in_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 572490aa168ed7e262e8ecd2cbc7e28a62b287c7
[INFO] testing willowell/classic_computer_science_problems_in_rust against 1.75.0 for beta-1.76-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwillowell%2Fclassic_computer_science_problems_in_rust" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/willowell/classic_computer_science_problems_in_rust on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/willowell/classic_computer_science_problems_in_rust
[INFO] finished tweaking git repo https://github.com/willowell/classic_computer_science_problems_in_rust
[INFO] tweaked toml for git repo https://github.com/willowell/classic_computer_science_problems_in_rust written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/willowell/classic_computer_science_problems_in_rust 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" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded memoize-inner v0.2.1
[INFO] [stderr]   Downloaded memoize v0.3.1
[INFO] [stderr]   Downloaded libpcp v0.6.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e62b8e0e55fbbf32ed0f84f7a7163f12eb822e73f1b4da2d6efd52d459df0279
[INFO] running `Command { std: "docker" "start" "-a" "e62b8e0e55fbbf32ed0f84f7a7163f12eb822e73f1b4da2d6efd52d459df0279", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e62b8e0e55fbbf32ed0f84f7a7163f12eb822e73f1b4da2d6efd52d459df0279", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e62b8e0e55fbbf32ed0f84f7a7163f12eb822e73f1b4da2d6efd52d459df0279", kill_on_drop: false }`
[INFO] [stdout] e62b8e0e55fbbf32ed0f84f7a7163f12eb822e73f1b4da2d6efd52d459df0279
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f332c7d0bec1041c3f889c7fe7397390d81138b4932c9ab12ca75abe97881307
[INFO] running `Command { std: "docker" "start" "-a" "f332c7d0bec1041c3f889c7fe7397390d81138b4932c9ab12ca75abe97881307", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling libc v0.2.134
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling proc-macro2 v1.0.46
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]    Compiling unicode-ident v1.0.4
[INFO] [stderr]    Compiling syn v1.0.101
[INFO] [stderr]    Compiling rustc-serialize v0.3.24
[INFO] [stderr]    Compiling indexmap v1.9.1
[INFO] [stderr]    Compiling num-iter v0.1.43
[INFO] [stderr]    Compiling bit-vec v0.6.3
[INFO] [stderr]    Compiling trilean v1.1.0
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling thiserror v1.0.37
[INFO] [stderr]    Compiling radium v0.7.0
[INFO] [stderr]    Compiling fixedbitset v0.4.2
[INFO] [stderr]    Compiling tap v1.0.1
[INFO] [stderr]    Compiling bit-vec v0.4.4
[INFO] [stderr]    Compiling either v1.8.0
[INFO] [stderr]    Compiling bit-set v0.5.3
[INFO] [stderr]    Compiling bit-set v0.4.0
[INFO] [stderr]    Compiling wyz v0.5.0
[INFO] [stderr]    Compiling itertools v0.10.5
[INFO] [stderr]    Compiling vec_map v0.6.0
[INFO] [stderr]    Compiling funty v2.0.0
[INFO] [stderr]    Compiling minimal-lexical v0.2.1
[INFO] [stderr]    Compiling unicode-width v0.1.10
[INFO] [stderr]    Compiling nom v7.1.1
[INFO] [stderr]    Compiling petgraph v0.6.2
[INFO] [stderr]    Compiling bitvec v1.0.1
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling getrandom v0.2.7
[INFO] [stderr]    Compiling terminal_size v0.1.17
[INFO] [stderr]    Compiling console v0.15.2
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling integer-sqrt v0.1.5
[INFO] [stderr]    Compiling ordered-float v3.3.0
[INFO] [stderr]    Compiling num-complex v0.1.43
[INFO] [stderr]    Compiling num-bigint v0.1.44
[INFO] [stderr]    Compiling gcollections v1.5.0
[INFO] [stderr]    Compiling intervallum v1.4.0
[INFO] [stderr]    Compiling num-rational v0.1.42
[INFO] [stderr]    Compiling num v0.1.42
[INFO] [stderr]    Compiling libpcp v0.6.4
[INFO] [stderr]    Compiling thiserror-impl v1.0.37
[INFO] [stderr]    Compiling memoize-inner v0.2.1
[INFO] [stderr]    Compiling memoize v0.3.1
[INFO] [stderr]    Compiling pathfinding v3.0.14
[INFO] [stderr]    Compiling classic_computer_science_problems v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `to_character` is never used
[INFO] [stdout]   --> src/maze.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl Cell {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] 17 |     fn to_character(&self) -> &str {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `euclidean_distance_to` is never used
[INFO] [stdout]   --> src/maze.rs:53:8
[INFO] [stdout]    |
[INFO] [stdout] 52 | impl MazeLocation {
[INFO] [stdout]    | ----------------- method in this implementation
[INFO] [stdout] 53 |     fn euclidean_distance_to(&self, dest: MazeLocation) -> f64 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]   --> src/csp.rs:59:28
[INFO] [stdout]    |
[INFO] [stdout] 59 |         for constraints in self.constraints.get(&variable) {
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(for_loops_over_fallibles)]` on by default
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]    |
[INFO] [stdout] 59 |         while let Some(constraints) = self.constraints.get(&variable) {
[INFO] [stdout]    |         ~~~~~~~~~~~~~~~           ~~~
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]    |
[INFO] [stdout] 59 |         if let Some(constraints) = self.constraints.get(&variable) {
[INFO] [stdout]    |         ~~~~~~~~~~~~           ~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]   --> src/csp.rs:82:28
[INFO] [stdout]    |
[INFO] [stdout] 82 |             for domains in self.domains.get(unassigned) {
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]    |
[INFO] [stdout] 82 |             while let Some(domains) = self.domains.get(unassigned) {
[INFO] [stdout]    |             ~~~~~~~~~~~~~~~       ~~~
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]    |
[INFO] [stdout] 82 |             if let Some(domains) = self.domains.get(unassigned) {
[INFO] [stdout]    |             ~~~~~~~~~~~~       ~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `ALPHABET_LENGTH` and `new` are never used
[INFO] [stdout]   --> book/chapter_03/word_search.rs:28:11
[INFO] [stdout]    |
[INFO] [stdout] 27 | impl WordGrid {
[INFO] [stdout]    | ------------- associated items in this implementation
[INFO] [stdout] 28 |     const ALPHABET_LENGTH: i32 = 26;
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 31 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> book/chapter_04/build_your_own_graph.rs:192:9
[INFO] [stdout]     |
[INFO] [stdout] 192 |     let mut ug = UnweightedGraph::new(vec!["Atlanta", "Boston", "Chicago"]);
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `uv` and `weight` are never read
[INFO] [stdout]   --> book/chapter_04/build_your_own_graph.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 54 | struct WeightedEdge<W> {
[INFO] [stdout]    |        ------------ fields in this struct
[INFO] [stdout] 55 |     uv: EdgeUV,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 56 |     weight: W,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `WeightedEdge` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `get_vertex_count`, `get_edge_count`, `insert_vertex`, `insert_edge`, and `get_edges_for_index` are never used
[INFO] [stdout]    --> book/chapter_04/build_your_own_graph.rs:93:8
[INFO] [stdout]     |
[INFO] [stdout] 88  | / impl<V, E> Graph<V, E>
[INFO] [stdout] 89  | | where
[INFO] [stdout] 90  | |     V: Clone + PartialEq,
[INFO] [stdout] 91  | |     E: Clone + Edge + PartialEq,
[INFO] [stdout]     | |________________________________- associated items in this implementation
[INFO] [stdout] 92  |   {
[INFO] [stdout] 93  |       fn new(vertices: Vec<V>) -> Self {
[INFO] [stdout]     |          ^^^
[INFO] [stdout] ...
[INFO] [stdout] 100 |       fn get_vertex_count(&self) -> usize {
[INFO] [stdout]     |          ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 104 |       fn get_edge_count(&self) -> usize {
[INFO] [stdout]     |          ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 108 |       fn insert_vertex(&mut self, v: V) -> usize {
[INFO] [stdout]     |          ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 114 |       fn insert_edge(&mut self, e: E) {
[INFO] [stdout]     |          ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 141 |       fn get_edges_for_index(&self, index: usize) -> Vec<E> {
[INFO] [stdout]     |          ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]   --> book/chapter_01/fib1.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn fib(x: u64) -> u64 {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^ cannot return without recursing
[INFO] [stdout] 11 |     fib(x - 1) + fib(x - 2)
[INFO] [stdout]    |     ---------- recursive call site
[INFO] [stdout]    |
[INFO] [stdout]    = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout]    = note: `#[warn(unconditional_recursion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.30s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rustc-serialize v0.3.24
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "f332c7d0bec1041c3f889c7fe7397390d81138b4932c9ab12ca75abe97881307", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f332c7d0bec1041c3f889c7fe7397390d81138b4932c9ab12ca75abe97881307", kill_on_drop: false }`
[INFO] [stdout] f332c7d0bec1041c3f889c7fe7397390d81138b4932c9ab12ca75abe97881307
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 54588241bd47cfa4f8cbe4e7535c16d1291b2ce917599fd30132f3e5703b1c2d
[INFO] running `Command { std: "docker" "start" "-a" "54588241bd47cfa4f8cbe4e7535c16d1291b2ce917599fd30132f3e5703b1c2d", kill_on_drop: false }`
[INFO] [stdout] warning: method `to_character` is never used
[INFO] [stdout]   --> src/maze.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl Cell {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] 17 |     fn to_character(&self) -> &str {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `euclidean_distance_to` is never used
[INFO] [stdout]   --> src/maze.rs:53:8
[INFO] [stdout]    |
[INFO] [stdout] 52 | impl MazeLocation {
[INFO] [stdout]    | ----------------- method in this implementation
[INFO] [stdout] 53 |     fn euclidean_distance_to(&self, dest: MazeLocation) -> f64 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]   --> src/csp.rs:59:28
[INFO] [stdout]    |
[INFO] [stdout] 59 |         for constraints in self.constraints.get(&variable) {
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(for_loops_over_fallibles)]` on by default
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]    |
[INFO] [stdout] 59 |         while let Some(constraints) = self.constraints.get(&variable) {
[INFO] [stdout]    |         ~~~~~~~~~~~~~~~           ~~~
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]    |
[INFO] [stdout] 59 |         if let Some(constraints) = self.constraints.get(&variable) {
[INFO] [stdout]    |         ~~~~~~~~~~~~           ~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling classic_computer_science_problems v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]   --> src/csp.rs:82:28
[INFO] [stdout]    |
[INFO] [stdout] 82 |             for domains in self.domains.get(unassigned) {
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]    |
[INFO] [stdout] 82 |             while let Some(domains) = self.domains.get(unassigned) {
[INFO] [stdout]    |             ~~~~~~~~~~~~~~~       ~~~
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]    |
[INFO] [stdout] 82 |             if let Some(domains) = self.domains.get(unassigned) {
[INFO] [stdout]    |             ~~~~~~~~~~~~       ~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]   --> book/chapter_01/fib1.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn fib(x: u64) -> u64 {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^ cannot return without recursing
[INFO] [stdout] 11 |     fib(x - 1) + fib(x - 2)
[INFO] [stdout]    |     ---------- recursive call site
[INFO] [stdout]    |
[INFO] [stdout]    = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout]    = note: `#[warn(unconditional_recursion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `ALPHABET_LENGTH` and `new` are never used
[INFO] [stdout]   --> book/chapter_03/word_search.rs:28:11
[INFO] [stdout]    |
[INFO] [stdout] 27 | impl WordGrid {
[INFO] [stdout]    | ------------- associated items in this implementation
[INFO] [stdout] 28 |     const ALPHABET_LENGTH: i32 = 26;
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 31 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `to_character` is never used
[INFO] [stdout]   --> src/maze.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl Cell {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] 17 |     fn to_character(&self) -> &str {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `euclidean_distance_to` is never used
[INFO] [stdout]   --> src/maze.rs:53:8
[INFO] [stdout]    |
[INFO] [stdout] 52 | impl MazeLocation {
[INFO] [stdout]    | ----------------- method in this implementation
[INFO] [stdout] 53 |     fn euclidean_distance_to(&self, dest: MazeLocation) -> f64 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]   --> src/csp.rs:59:28
[INFO] [stdout]    |
[INFO] [stdout] 59 |         for constraints in self.constraints.get(&variable) {
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(for_loops_over_fallibles)]` on by default
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]    |
[INFO] [stdout] 59 |         while let Some(constraints) = self.constraints.get(&variable) {
[INFO] [stdout]    |         ~~~~~~~~~~~~~~~           ~~~
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]    |
[INFO] [stdout] 59 |         if let Some(constraints) = self.constraints.get(&variable) {
[INFO] [stdout]    |         ~~~~~~~~~~~~           ~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]   --> src/csp.rs:82:28
[INFO] [stdout]    |
[INFO] [stdout] 82 |             for domains in self.domains.get(unassigned) {
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]    |
[INFO] [stdout] 82 |             while let Some(domains) = self.domains.get(unassigned) {
[INFO] [stdout]    |             ~~~~~~~~~~~~~~~       ~~~
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]    |
[INFO] [stdout] 82 |             if let Some(domains) = self.domains.get(unassigned) {
[INFO] [stdout]    |             ~~~~~~~~~~~~       ~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> book/chapter_04/build_your_own_graph.rs:192:9
[INFO] [stdout]     |
[INFO] [stdout] 192 |     let mut ug = UnweightedGraph::new(vec!["Atlanta", "Boston", "Chicago"]);
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `uv` and `weight` are never read
[INFO] [stdout]   --> book/chapter_04/build_your_own_graph.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 54 | struct WeightedEdge<W> {
[INFO] [stdout]    |        ------------ fields in this struct
[INFO] [stdout] 55 |     uv: EdgeUV,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 56 |     weight: W,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `WeightedEdge` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `get_vertex_count`, `get_edge_count`, `insert_vertex`, `insert_edge`, and `get_edges_for_index` are never used
[INFO] [stdout]    --> book/chapter_04/build_your_own_graph.rs:93:8
[INFO] [stdout]     |
[INFO] [stdout] 88  | / impl<V, E> Graph<V, E>
[INFO] [stdout] 89  | | where
[INFO] [stdout] 90  | |     V: Clone + PartialEq,
[INFO] [stdout] 91  | |     E: Clone + Edge + PartialEq,
[INFO] [stdout]     | |________________________________- associated items in this implementation
[INFO] [stdout] 92  |   {
[INFO] [stdout] 93  |       fn new(vertices: Vec<V>) -> Self {
[INFO] [stdout]     |          ^^^
[INFO] [stdout] ...
[INFO] [stdout] 100 |       fn get_vertex_count(&self) -> usize {
[INFO] [stdout]     |          ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 104 |       fn get_edge_count(&self) -> usize {
[INFO] [stdout]     |          ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 108 |       fn insert_vertex(&mut self, v: V) -> usize {
[INFO] [stdout]     |          ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 114 |       fn insert_edge(&mut self, e: E) {
[INFO] [stdout]     |          ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 141 |       fn get_edges_for_index(&self, index: usize) -> Vec<E> {
[INFO] [stdout]     |          ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.69s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rustc-serialize v0.3.24
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "54588241bd47cfa4f8cbe4e7535c16d1291b2ce917599fd30132f3e5703b1c2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "54588241bd47cfa4f8cbe4e7535c16d1291b2ce917599fd30132f3e5703b1c2d", kill_on_drop: false }`
[INFO] [stdout] 54588241bd47cfa4f8cbe4e7535c16d1291b2ce917599fd30132f3e5703b1c2d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 5222574c46619ae158cec8ec48da245fbac618ad854f71a1711473eb8727b825
[INFO] running `Command { std: "docker" "start" "-a" "5222574c46619ae158cec8ec48da245fbac618ad854f71a1711473eb8727b825", kill_on_drop: false }`
[INFO] [stderr] warning: method `to_character` is never used
[INFO] [stderr]   --> src/maze.rs:17:8
[INFO] [stderr]    |
[INFO] [stderr] 16 | impl Cell {
[INFO] [stderr]    | --------- method in this implementation
[INFO] [stderr] 17 |     fn to_character(&self) -> &str {
[INFO] [stderr]    |        ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method `euclidean_distance_to` is never used
[INFO] [stderr]   --> src/maze.rs:53:8
[INFO] [stderr]    |
[INFO] [stderr] 52 | impl MazeLocation {
[INFO] [stderr]    | ----------------- method in this implementation
[INFO] [stderr] 53 |     fn euclidean_distance_to(&self, dest: MazeLocation) -> f64 {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stderr]   --> src/csp.rs:59:28
[INFO] [stderr]    |
[INFO] [stderr] 59 |         for constraints in self.constraints.get(&variable) {
[INFO] [stderr]    |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(for_loops_over_fallibles)]` on by default
[INFO] [stderr] help: to check pattern in a loop use `while let`
[INFO] [stderr]    |
[INFO] [stderr] 59 |         while let Some(constraints) = self.constraints.get(&variable) {
[INFO] [stderr]    |         ~~~~~~~~~~~~~~~           ~~~
[INFO] [stderr] help: consider using `if let` to clear intent
[INFO] [stderr]    |
[INFO] [stderr] 59 |         if let Some(constraints) = self.constraints.get(&variable) {
[INFO] [stderr]    |         ~~~~~~~~~~~~           ~~~
[INFO] [stderr] 
[INFO] [stderr] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stderr]   --> src/csp.rs:82:28
[INFO] [stderr]    |
[INFO] [stderr] 82 |             for domains in self.domains.get(unassigned) {
[INFO] [stderr]    |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] help: to check pattern in a loop use `while let`
[INFO] [stderr]    |
[INFO] [stderr] 82 |             while let Some(domains) = self.domains.get(unassigned) {
[INFO] [stderr]    |             ~~~~~~~~~~~~~~~       ~~~
[INFO] [stderr] help: consider using `if let` to clear intent
[INFO] [stderr]    |
[INFO] [stderr] 82 |             if let Some(domains) = self.domains.get(unassigned) {
[INFO] [stderr]    |             ~~~~~~~~~~~~       ~~~
[INFO] [stderr] 
[INFO] [stderr] warning: `classic_computer_science_problems` (lib) generated 4 warnings
[INFO] [stderr] warning: `classic_computer_science_problems` (lib test) generated 4 warnings (4 duplicates)
[INFO] [stderr] warning: associated items `ALPHABET_LENGTH` and `new` are never used
[INFO] [stderr]   --> book/chapter_03/word_search.rs:28:11
[INFO] [stderr]    |
[INFO] [stderr] 27 | impl WordGrid {
[INFO] [stderr]    | ------------- associated items in this implementation
[INFO] [stderr] 28 |     const ALPHABET_LENGTH: i32 = 26;
[INFO] [stderr]    |           ^^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 31 |     pub fn new() -> Self {
[INFO] [stderr]    |            ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> book/chapter_04/build_your_own_graph.rs:192:9
[INFO] [stderr]     |
[INFO] [stderr] 192 |     let mut ug = UnweightedGraph::new(vec!["Atlanta", "Boston", "Chicago"]);
[INFO] [stderr]     |         ----^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: fields `uv` and `weight` are never read
[INFO] [stderr]   --> book/chapter_04/build_your_own_graph.rs:55:5
[INFO] [stderr]    |
[INFO] [stderr] 54 | struct WeightedEdge<W> {
[INFO] [stderr]    |        ------------ fields in this struct
[INFO] [stderr] 55 |     uv: EdgeUV,
[INFO] [stderr]    |     ^^
[INFO] [stderr] 56 |     weight: W,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `WeightedEdge` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `new`, `get_vertex_count`, `get_edge_count`, `insert_vertex`, `insert_edge`, and `get_edges_for_index` are never used
[INFO] [stderr]    --> book/chapter_04/build_your_own_graph.rs:93:8
[INFO] [stderr]     |
[INFO] [stderr] 88  | / impl<V, E> Graph<V, E>
[INFO] [stderr] 89  | | where
[INFO] [stderr] 90  | |     V: Clone + PartialEq,
[INFO] [stderr] 91  | |     E: Clone + Edge + PartialEq,
[INFO] [stderr]     | |________________________________- associated items in this implementation
[INFO] [stderr] 92  |   {
[INFO] [stderr] 93  |       fn new(vertices: Vec<V>) -> Self {
[INFO] [stderr]     |          ^^^
[INFO] [stderr] ...
[INFO] [stderr] 100 |       fn get_vertex_count(&self) -> usize {
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 104 |       fn get_edge_count(&self) -> usize {
[INFO] [stderr]     |          ^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 108 |       fn insert_vertex(&mut self, v: V) -> usize {
[INFO] [stderr]     |          ^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 114 |       fn insert_edge(&mut self, e: E) {
[INFO] [stderr]     |          ^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 141 |       fn get_edges_for_index(&self, index: usize) -> Vec<E> {
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function cannot return without recursing
[INFO] [stderr]   --> book/chapter_01/fib1.rs:10:1
[INFO] [stderr]    |
[INFO] [stderr] 10 | fn fib(x: u64) -> u64 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^ cannot return without recursing
[INFO] [stderr] 11 |     fib(x - 1) + fib(x - 2)
[INFO] [stderr]    |     ---------- recursive call site
[INFO] [stderr]    |
[INFO] [stderr]    = help: a `loop` may express intention better if this is on purpose
[INFO] [stderr]    = note: `#[warn(unconditional_recursion)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `classic_computer_science_problems` (bin "word_search" test) generated 1 warning
[INFO] [stderr] warning: `classic_computer_science_problems` (bin "byog" test) generated 3 warnings (run `cargo fix --bin "byog" --tests` to apply 1 suggestion)
[INFO] [stderr] warning: `classic_computer_science_problems` (bin "fib1" test) generated 1 warning
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rustc-serialize v0.3.24
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/classic_computer_science_problems-d042fef0b6cdc1c9)
[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 book/chapter_03/australian_map_colouring.rs (/opt/rustwide/target/debug/deps/au_map-1f5c0f1d8d2cf617)
[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 book/chapter_01/bit_vectors.rs (/opt/rustwide/target/debug/deps/bit_vectors-fb89d5e96e1bd0b6)
[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 book/chapter_04/build_your_own_graph.rs (/opt/rustwide/target/debug/deps/byog-ad1a9e077293faaa)
[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 book/chapter_01/calculate_pi.rs (/opt/rustwide/target/debug/deps/calculate_pi-e2991ed21d80e427)
[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 src/main.rs (/opt/rustwide/target/debug/deps/classic_computer_science_problems-42dc2c6b96070c2b)
[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 book/chapter_01/compressed_gene.rs (/opt/rustwide/target/debug/deps/compressed_gene-f9a676c74cb40c59)
[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 book/chapter_02/dna_search.rs (/opt/rustwide/target/debug/deps/dna_search-5926d38d383a6f00)
[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 book/chapter_03/eight_queens.rs (/opt/rustwide/target/debug/deps/eight_queens-4ba67f0b9d409eea)
[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 book/chapter_03/eight_queens2.rs (/opt/rustwide/target/debug/deps/eight_queens2-0c0352d8d7327368)
[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 book/chapter_01/fib1.rs (/opt/rustwide/target/debug/deps/fib1-192f376c5da2c8c1)
[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 book/chapter_01/fib2.rs (/opt/rustwide/target/debug/deps/fib2-f453a00dadb0a392)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running unittests book/chapter_01/fib3.rs (/opt/rustwide/target/debug/deps/fib3-7f57c40cee9b83e0)
[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] [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 book/chapter_01/fib4.rs (/opt/rustwide/target/debug/deps/fib4-fb636e846b45c191)
[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 book/chapter_01/fib5.rs (/opt/rustwide/target/debug/deps/fib5-fa53d711472c1bd8)
[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 book/chapter_01/fib6.rs (/opt/rustwide/target/debug/deps/fib6-b36f7ac4e1c9547b)
[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 book/chapter_02/generic_search.rs (/opt/rustwide/target/debug/deps/generic_search-75c6346ef0a1132a)
[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 book/chapter_01/hanoi.rs (/opt/rustwide/target/debug/deps/hanoi-53936a1777d93898)
[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 book/chapter_01/exercises/hanoi_k_towers.rs (/opt/rustwide/target/debug/deps/hanoi_k_towers-a2e0190e2432df62)
[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 book/chapter_01/exercises/image_otp.rs (/opt/rustwide/target/debug/deps/image_otp-a361fb5ff0f2938c)
[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 book/chapter_02/exercises/linear_binary_search_performance.rs (/opt/rustwide/target/debug/deps/linear_binary_search_performance-6f57b9c83a040d13)
[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 book/chapter_02/maze.rs (/opt/rustwide/target/debug/deps/maze-bc90e1ad032b9bae)
[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 book/chapter_02/maze2.rs (/opt/rustwide/target/debug/deps/maze2-7a1bef0fbccfe0ac)
[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 book/chapter_02/exercises/maze_search_states.rs (/opt/rustwide/target/debug/deps/maze_search_states-1e142e3a698d5c06)
[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 book/chapter_02/missionaries_and_cannibals.rs (/opt/rustwide/target/debug/deps/mc-69242bbb9b1ae133)
[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 book/chapter_02/exercises/more_missionaries_and_cannibals.rs (/opt/rustwide/target/debug/deps/more_mc-fa1a7918c0d168f0)
[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 book/chapter_03/send_more_money.rs (/opt/rustwide/target/debug/deps/send_more_money-4ea5c4e2648c592b)
[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 book/chapter_01/unbreakable_encryption.rs (/opt/rustwide/target/debug/deps/unbreakable_encryption-41afc421f6c7b5e2)
[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 book/chapter_03/word_search.rs (/opt/rustwide/target/debug/deps/word_search-d36c274702bcfb77)
[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]    Doc-tests classic_computer_science_problems
[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" "5222574c46619ae158cec8ec48da245fbac618ad854f71a1711473eb8727b825", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5222574c46619ae158cec8ec48da245fbac618ad854f71a1711473eb8727b825", kill_on_drop: false }`
[INFO] [stdout] 5222574c46619ae158cec8ec48da245fbac618ad854f71a1711473eb8727b825
