[INFO] cloning repository https://github.com/theNEOkun/AStar-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/theNEOkun/AStar-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FtheNEOkun%2FAStar-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FtheNEOkun%2FAStar-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2452c25000872ce76883097ee306a8b5d66902e3
[INFO] checking theNEOkun/AStar-rust against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FtheNEOkun%2FAStar-rust" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/theNEOkun/AStar-rust on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/theNEOkun/AStar-rust
[INFO] finished tweaking git repo https://github.com/theNEOkun/AStar-rust
[INFO] tweaked toml for git repo https://github.com/theNEOkun/AStar-rust written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/theNEOkun/AStar-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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 331b7c5beefdfb30e9f4b8a6ee9b24dabf5ef0bd8a571636f673eb46257a5444
[INFO] running `Command { std: "docker" "start" "-a" "331b7c5beefdfb30e9f4b8a6ee9b24dabf5ef0bd8a571636f673eb46257a5444", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "331b7c5beefdfb30e9f4b8a6ee9b24dabf5ef0bd8a571636f673eb46257a5444", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "331b7c5beefdfb30e9f4b8a6ee9b24dabf5ef0bd8a571636f673eb46257a5444", kill_on_drop: false }`
[INFO] [stdout] 331b7c5beefdfb30e9f4b8a6ee9b24dabf5ef0bd8a571636f673eb46257a5444
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e3b9c88b2d790e5a2920d9d47936156b97c4d52991d0a481888160c32266bf75
[INFO] running `Command { std: "docker" "start" "-a" "e3b9c88b2d790e5a2920d9d47936156b97c4d52991d0a481888160c32266bf75", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling libc v0.2.112
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.5
[INFO] [stderr]    Compiling crc32fast v1.3.0
[INFO] [stderr]     Checking scoped_threadpool v0.1.9
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]     Checking png v0.16.8
[INFO] [stderr]     Checking crossbeam-channel v0.5.1
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking crossbeam-deque v0.8.1
[INFO] [stderr]     Checking rayon-core v1.9.1
[INFO] [stderr]     Checking jpeg-decoder v0.1.22
[INFO] [stderr]     Checking tiff v0.6.1
[INFO] [stderr]     Checking image v0.23.14
[INFO] [stderr]     Checking djikstra v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:27:37
[INFO] [stdout]    |
[INFO] [stdout] 27 |                         && (!matrix[(neigbour.get_position())].get_visited()
[INFO] [stdout]    |                                     ^                       ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 27 -                         && (!matrix[(neigbour.get_position())].get_visited()
[INFO] [stdout] 27 +                         && (!matrix[neigbour.get_position()].get_visited()
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:28:46
[INFO] [stdout]    |
[INFO] [stdout] 28 | ...                   || cost < matrix[(neigbour.get_position())].get_distance())
[INFO] [stdout]    |                                        ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 28 -                             || cost < matrix[(neigbour.get_position())].get_distance())
[INFO] [stdout] 28 +                             || cost < matrix[neigbour.get_position()].get_distance())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:31:32
[INFO] [stdout]    |
[INFO] [stdout] 31 |                         matrix[(neigbour.get_position())].set_visited(true);
[INFO] [stdout]    |                                ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 31 -                         matrix[(neigbour.get_position())].set_visited(true);
[INFO] [stdout] 31 +                         matrix[neigbour.get_position()].set_visited(true);
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:32:32
[INFO] [stdout]    |
[INFO] [stdout] 32 |                         matrix[(neigbour.get_position())].set_distance(cost);
[INFO] [stdout]    |                                ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 32 -                         matrix[(neigbour.get_position())].set_distance(cost);
[INFO] [stdout] 32 +                         matrix[neigbour.get_position()].set_distance(cost);
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:33:32
[INFO] [stdout]    |
[INFO] [stdout] 33 |                         matrix[(neigbour.get_position())].set_heuristics(heuristic);
[INFO] [stdout]    |                                ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 33 -                         matrix[(neigbour.get_position())].set_heuristics(heuristic);
[INFO] [stdout] 33 +                         matrix[neigbour.get_position()].set_heuristics(heuristic);
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:34:32
[INFO] [stdout]    |
[INFO] [stdout] 34 |                         matrix[(neigbour.get_position())].set_parent(current.clone());
[INFO] [stdout]    |                                ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 34 -                         matrix[(neigbour.get_position())].set_parent(current.clone());
[INFO] [stdout] 34 +                         matrix[neigbour.get_position()].set_parent(current.clone());
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:38:40
[INFO] [stdout]    |
[INFO] [stdout] 38 |                         pq.push(matrix[(neigbour.get_position())].clone());
[INFO] [stdout]    |                                        ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 38 -                         pq.push(matrix[(neigbour.get_position())].clone());
[INFO] [stdout] 38 +                         pq.push(matrix[neigbour.get_position()].clone());
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:66:39
[INFO] [stdout]    |
[INFO] [stdout] 66 |     if let Some(parent_pos) = *matrix[(end)].get_parent() {
[INFO] [stdout]    |                                       ^   ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 66 -     if let Some(parent_pos) = *matrix[(end)].get_parent() {
[INFO] [stdout] 66 +     if let Some(parent_pos) = *matrix[end].get_parent() {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:27:37
[INFO] [stdout]    |
[INFO] [stdout] 27 |                         && (!matrix[(neigbour.get_position())].get_visited()
[INFO] [stdout]    |                                     ^                       ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 27 -                         && (!matrix[(neigbour.get_position())].get_visited()
[INFO] [stdout] 27 +                         && (!matrix[neigbour.get_position()].get_visited()
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:28:46
[INFO] [stdout]    |
[INFO] [stdout] 28 | ...                   || cost < matrix[(neigbour.get_position())].get_distance())
[INFO] [stdout]    |                                        ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 28 -                             || cost < matrix[(neigbour.get_position())].get_distance())
[INFO] [stdout] 28 +                             || cost < matrix[neigbour.get_position()].get_distance())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:31:32
[INFO] [stdout]    |
[INFO] [stdout] 31 |                         matrix[(neigbour.get_position())].set_visited(true);
[INFO] [stdout]    |                                ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 31 -                         matrix[(neigbour.get_position())].set_visited(true);
[INFO] [stdout] 31 +                         matrix[neigbour.get_position()].set_visited(true);
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:32:32
[INFO] [stdout]    |
[INFO] [stdout] 32 |                         matrix[(neigbour.get_position())].set_distance(cost);
[INFO] [stdout]    |                                ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 32 -                         matrix[(neigbour.get_position())].set_distance(cost);
[INFO] [stdout] 32 +                         matrix[neigbour.get_position()].set_distance(cost);
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:33:32
[INFO] [stdout]    |
[INFO] [stdout] 33 |                         matrix[(neigbour.get_position())].set_heuristics(heuristic);
[INFO] [stdout]    |                                ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 33 -                         matrix[(neigbour.get_position())].set_heuristics(heuristic);
[INFO] [stdout] 33 +                         matrix[neigbour.get_position()].set_heuristics(heuristic);
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:34:32
[INFO] [stdout]    |
[INFO] [stdout] 34 |                         matrix[(neigbour.get_position())].set_parent(current.clone());
[INFO] [stdout]    |                                ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 34 -                         matrix[(neigbour.get_position())].set_parent(current.clone());
[INFO] [stdout] 34 +                         matrix[neigbour.get_position()].set_parent(current.clone());
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:38:40
[INFO] [stdout]    |
[INFO] [stdout] 38 |                         pq.push(matrix[(neigbour.get_position())].clone());
[INFO] [stdout]    |                                        ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 38 -                         pq.push(matrix[(neigbour.get_position())].clone());
[INFO] [stdout] 38 +                         pq.push(matrix[neigbour.get_position()].clone());
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:66:39
[INFO] [stdout]    |
[INFO] [stdout] 66 |     if let Some(parent_pos) = *matrix[(end)].get_parent() {
[INFO] [stdout]    |                                       ^   ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 66 -     if let Some(parent_pos) = *matrix[(end)].get_parent() {
[INFO] [stdout] 66 +     if let Some(parent_pos) = *matrix[end].get_parent() {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name`, `start`, and `end` are never read
[INFO] [stdout]   --> src/backend/mod.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub struct DataHandle<'a, T: Cell> {
[INFO] [stdout]    |            ---------- fields in this struct
[INFO] [stdout] 15 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |     start: Position,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 22 |     end: Position,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `write_matrix` is never used
[INFO] [stdout]   --> src/backend/file_handler.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl FileHandler {
[INFO] [stdout]    | ---------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 36 |     pub fn write_matrix<T: Cell>(&self, matrix: &Matrix<T>) {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `show` is never used
[INFO] [stdout]    --> src/backend/matrix.rs:100:12
[INFO] [stdout]     |
[INFO] [stdout] 47  | impl<T: Cell> Matrix<T> {
[INFO] [stdout]     | ----------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 100 |     pub fn show(&self) {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `get_heuristics` and `get_type` are never used
[INFO] [stdout]   --> src/cell/cell.rs:68:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub trait Cell: Display + Debug + Eq + PartialEq<Self> + PartialOrd<Self> + Ord + Clone {
[INFO] [stdout]    |           ---- methods in this trait
[INFO] [stdout] ...
[INFO] [stdout] 68 |     fn get_heuristics(&self) -> u32;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 72 |     fn get_type(&self) -> u8;
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/backend/file_handler.rs:40:21
[INFO] [stdout]    |
[INFO] [stdout] 40 |                     writer.write(format!("{}", &matrix[(y, x)]).as_ref());
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 40 |                     let _ = writer.write(format!("{}", &matrix[(y, x)]).as_ref());
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/backend/file_handler.rs:41:21
[INFO] [stdout]    |
[INFO] [stdout] 41 |                     writer.write(" ".as_ref());
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 41 |                     let _ = writer.write(" ".as_ref());
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/backend/file_handler.rs:43:17
[INFO] [stdout]    |
[INFO] [stdout] 43 |                 writer.write("\n".as_ref());
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 43 |                 let _ = writer.write("\n".as_ref());
[INFO] [stdout]    |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name`, `start`, and `end` are never read
[INFO] [stdout]   --> src/backend/mod.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub struct DataHandle<'a, T: Cell> {
[INFO] [stdout]    |            ---------- fields in this struct
[INFO] [stdout] 15 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |     start: Position,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 22 |     end: Position,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `write_matrix` is never used
[INFO] [stdout]   --> src/backend/file_handler.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl FileHandler {
[INFO] [stdout]    | ---------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 36 |     pub fn write_matrix<T: Cell>(&self, matrix: &Matrix<T>) {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `show` is never used
[INFO] [stdout]    --> src/backend/matrix.rs:100:12
[INFO] [stdout]     |
[INFO] [stdout] 47  | impl<T: Cell> Matrix<T> {
[INFO] [stdout]     | ----------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 100 |     pub fn show(&self) {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `get_heuristics` and `get_type` are never used
[INFO] [stdout]   --> src/cell/cell.rs:68:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub trait Cell: Display + Debug + Eq + PartialEq<Self> + PartialOrd<Self> + Ord + Clone {
[INFO] [stdout]    |           ---- methods in this trait
[INFO] [stdout] ...
[INFO] [stdout] 68 |     fn get_heuristics(&self) -> u32;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 72 |     fn get_type(&self) -> u8;
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/backend/file_handler.rs:40:21
[INFO] [stdout]    |
[INFO] [stdout] 40 |                     writer.write(format!("{}", &matrix[(y, x)]).as_ref());
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 40 |                     let _ = writer.write(format!("{}", &matrix[(y, x)]).as_ref());
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/backend/file_handler.rs:41:21
[INFO] [stdout]    |
[INFO] [stdout] 41 |                     writer.write(" ".as_ref());
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 41 |                     let _ = writer.write(" ".as_ref());
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/backend/file_handler.rs:43:17
[INFO] [stdout]    |
[INFO] [stdout] 43 |                 writer.write("\n".as_ref());
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 43 |                 let _ = writer.write("\n".as_ref());
[INFO] [stdout]    |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 9.67s
[INFO] running `Command { std: "docker" "inspect" "e3b9c88b2d790e5a2920d9d47936156b97c4d52991d0a481888160c32266bf75", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e3b9c88b2d790e5a2920d9d47936156b97c4d52991d0a481888160c32266bf75", kill_on_drop: false }`
[INFO] [stdout] e3b9c88b2d790e5a2920d9d47936156b97c4d52991d0a481888160c32266bf75
[INFO] checking theNEOkun/AStar-rust against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FtheNEOkun%2FAStar-rust" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/theNEOkun/AStar-rust on toolchain 645bb72776a6a56a1a8f52631a44bd082b2ba509
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/theNEOkun/AStar-rust
[INFO] finished tweaking git repo https://github.com/theNEOkun/AStar-rust
[INFO] tweaked toml for git repo https://github.com/theNEOkun/AStar-rust written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/theNEOkun/AStar-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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3f8e5097ada6017ab2be9e610756948ea94e06db47e39f63693139b87a43acf0
[INFO] running `Command { std: "docker" "start" "-a" "3f8e5097ada6017ab2be9e610756948ea94e06db47e39f63693139b87a43acf0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3f8e5097ada6017ab2be9e610756948ea94e06db47e39f63693139b87a43acf0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3f8e5097ada6017ab2be9e610756948ea94e06db47e39f63693139b87a43acf0", kill_on_drop: false }`
[INFO] [stdout] 3f8e5097ada6017ab2be9e610756948ea94e06db47e39f63693139b87a43acf0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7199640d536e84cdb744b439bfd107ec051c6ec898dd3a2d0f5b0d4aa7bc04d5
[INFO] running `Command { std: "docker" "start" "-a" "7199640d536e84cdb744b439bfd107ec051c6ec898dd3a2d0f5b0d4aa7bc04d5", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.5
[INFO] [stderr]    Compiling libc v0.2.112
[INFO] [stderr]    Compiling crc32fast v1.3.0
[INFO] [stderr]     Checking bytemuck v1.7.3
[INFO] [stderr]     Checking scoped_threadpool v0.1.9
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]     Checking png v0.16.8
[INFO] [stderr]     Checking crossbeam-channel v0.5.1
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking crossbeam-deque v0.8.1
[INFO] [stderr]     Checking rayon-core v1.9.1
[INFO] [stderr]     Checking jpeg-decoder v0.1.22
[INFO] [stderr]     Checking tiff v0.6.1
[INFO] [stderr]     Checking image v0.23.14
[INFO] [stderr]     Checking djikstra v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:27:37
[INFO] [stdout]    |
[INFO] [stdout] 27 |                         && (!matrix[(neigbour.get_position())].get_visited()
[INFO] [stdout]    |                                     ^                       ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 27 -                         && (!matrix[(neigbour.get_position())].get_visited()
[INFO] [stdout] 27 +                         && (!matrix[neigbour.get_position()].get_visited()
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:28:46
[INFO] [stdout]    |
[INFO] [stdout] 28 | ...                   || cost < matrix[(neigbour.get_position())].get_distance())
[INFO] [stdout]    |                                        ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 28 -                             || cost < matrix[(neigbour.get_position())].get_distance())
[INFO] [stdout] 28 +                             || cost < matrix[neigbour.get_position()].get_distance())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:31:32
[INFO] [stdout]    |
[INFO] [stdout] 31 |                         matrix[(neigbour.get_position())].set_visited(true);
[INFO] [stdout]    |                                ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 31 -                         matrix[(neigbour.get_position())].set_visited(true);
[INFO] [stdout] 31 +                         matrix[neigbour.get_position()].set_visited(true);
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:32:32
[INFO] [stdout]    |
[INFO] [stdout] 32 |                         matrix[(neigbour.get_position())].set_distance(cost);
[INFO] [stdout]    |                                ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 32 -                         matrix[(neigbour.get_position())].set_distance(cost);
[INFO] [stdout] 32 +                         matrix[neigbour.get_position()].set_distance(cost);
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:33:32
[INFO] [stdout]    |
[INFO] [stdout] 33 |                         matrix[(neigbour.get_position())].set_heuristics(heuristic);
[INFO] [stdout]    |                                ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 33 -                         matrix[(neigbour.get_position())].set_heuristics(heuristic);
[INFO] [stdout] 33 +                         matrix[neigbour.get_position()].set_heuristics(heuristic);
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:34:32
[INFO] [stdout]    |
[INFO] [stdout] 34 |                         matrix[(neigbour.get_position())].set_parent(current.clone());
[INFO] [stdout]    |                                ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 34 -                         matrix[(neigbour.get_position())].set_parent(current.clone());
[INFO] [stdout] 34 +                         matrix[neigbour.get_position()].set_parent(current.clone());
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:38:40
[INFO] [stdout]    |
[INFO] [stdout] 38 |                         pq.push(matrix[(neigbour.get_position())].clone());
[INFO] [stdout]    |                                        ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 38 -                         pq.push(matrix[(neigbour.get_position())].clone());
[INFO] [stdout] 38 +                         pq.push(matrix[neigbour.get_position()].clone());
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:66:39
[INFO] [stdout]    |
[INFO] [stdout] 66 |     if let Some(parent_pos) = *matrix[(end)].get_parent() {
[INFO] [stdout]    |                                       ^   ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 66 -     if let Some(parent_pos) = *matrix[(end)].get_parent() {
[INFO] [stdout] 66 +     if let Some(parent_pos) = *matrix[end].get_parent() {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:27:37
[INFO] [stdout]    |
[INFO] [stdout] 27 |                         && (!matrix[(neigbour.get_position())].get_visited()
[INFO] [stdout]    |                                     ^                       ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 27 -                         && (!matrix[(neigbour.get_position())].get_visited()
[INFO] [stdout] 27 +                         && (!matrix[neigbour.get_position()].get_visited()
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:28:46
[INFO] [stdout]    |
[INFO] [stdout] 28 | ...                   || cost < matrix[(neigbour.get_position())].get_distance())
[INFO] [stdout]    |                                        ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 28 -                             || cost < matrix[(neigbour.get_position())].get_distance())
[INFO] [stdout] 28 +                             || cost < matrix[neigbour.get_position()].get_distance())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:31:32
[INFO] [stdout]    |
[INFO] [stdout] 31 |                         matrix[(neigbour.get_position())].set_visited(true);
[INFO] [stdout]    |                                ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 31 -                         matrix[(neigbour.get_position())].set_visited(true);
[INFO] [stdout] 31 +                         matrix[neigbour.get_position()].set_visited(true);
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:32:32
[INFO] [stdout]    |
[INFO] [stdout] 32 |                         matrix[(neigbour.get_position())].set_distance(cost);
[INFO] [stdout]    |                                ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 32 -                         matrix[(neigbour.get_position())].set_distance(cost);
[INFO] [stdout] 32 +                         matrix[neigbour.get_position()].set_distance(cost);
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:33:32
[INFO] [stdout]    |
[INFO] [stdout] 33 |                         matrix[(neigbour.get_position())].set_heuristics(heuristic);
[INFO] [stdout]    |                                ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 33 -                         matrix[(neigbour.get_position())].set_heuristics(heuristic);
[INFO] [stdout] 33 +                         matrix[neigbour.get_position()].set_heuristics(heuristic);
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:34:32
[INFO] [stdout]    |
[INFO] [stdout] 34 |                         matrix[(neigbour.get_position())].set_parent(current.clone());
[INFO] [stdout]    |                                ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 34 -                         matrix[(neigbour.get_position())].set_parent(current.clone());
[INFO] [stdout] 34 +                         matrix[neigbour.get_position()].set_parent(current.clone());
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:38:40
[INFO] [stdout]    |
[INFO] [stdout] 38 |                         pq.push(matrix[(neigbour.get_position())].clone());
[INFO] [stdout]    |                                        ^                       ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 38 -                         pq.push(matrix[(neigbour.get_position())].clone());
[INFO] [stdout] 38 +                         pq.push(matrix[neigbour.get_position()].clone());
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/djikstra/mod.rs:66:39
[INFO] [stdout]    |
[INFO] [stdout] 66 |     if let Some(parent_pos) = *matrix[(end)].get_parent() {
[INFO] [stdout]    |                                       ^   ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 66 -     if let Some(parent_pos) = *matrix[(end)].get_parent() {
[INFO] [stdout] 66 +     if let Some(parent_pos) = *matrix[end].get_parent() {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name`, `start`, and `end` are never read
[INFO] [stdout]   --> src/backend/mod.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub struct DataHandle<'a, T: Cell> {
[INFO] [stdout]    |            ---------- fields in this struct
[INFO] [stdout] 15 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |     start: Position,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 22 |     end: Position,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `write_matrix` is never used
[INFO] [stdout]   --> src/backend/file_handler.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl FileHandler {
[INFO] [stdout]    | ---------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 36 |     pub fn write_matrix<T: Cell>(&self, matrix: &Matrix<T>) {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `show` is never used
[INFO] [stdout]    --> src/backend/matrix.rs:100:12
[INFO] [stdout]     |
[INFO] [stdout] 47  | impl<T: Cell> Matrix<T> {
[INFO] [stdout]     | ----------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 100 |     pub fn show(&self) {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `get_heuristics` and `get_type` are never used
[INFO] [stdout]   --> src/cell/cell.rs:68:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub trait Cell: Display + Debug + Eq + PartialEq<Self> + PartialOrd<Self> + Ord + Clone {
[INFO] [stdout]    |           ---- methods in this trait
[INFO] [stdout] ...
[INFO] [stdout] 68 |     fn get_heuristics(&self) -> u32;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 72 |     fn get_type(&self) -> u8;
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/backend/file_handler.rs:40:21
[INFO] [stdout]    |
[INFO] [stdout] 40 |                     writer.write(format!("{}", &matrix[(y, x)]).as_ref());
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 40 |                     let _ = writer.write(format!("{}", &matrix[(y, x)]).as_ref());
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/backend/file_handler.rs:41:21
[INFO] [stdout]    |
[INFO] [stdout] 41 |                     writer.write(" ".as_ref());
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 41 |                     let _ = writer.write(" ".as_ref());
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/backend/file_handler.rs:43:17
[INFO] [stdout]    |
[INFO] [stdout] 43 |                 writer.write("\n".as_ref());
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 43 |                 let _ = writer.write("\n".as_ref());
[INFO] [stdout]    |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name`, `start`, and `end` are never read
[INFO] [stdout]   --> src/backend/mod.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub struct DataHandle<'a, T: Cell> {
[INFO] [stdout]    |            ---------- fields in this struct
[INFO] [stdout] 15 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |     start: Position,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 22 |     end: Position,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `write_matrix` is never used
[INFO] [stdout]   --> src/backend/file_handler.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl FileHandler {
[INFO] [stdout]    | ---------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 36 |     pub fn write_matrix<T: Cell>(&self, matrix: &Matrix<T>) {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `show` is never used
[INFO] [stdout]    --> src/backend/matrix.rs:100:12
[INFO] [stdout]     |
[INFO] [stdout] 47  | impl<T: Cell> Matrix<T> {
[INFO] [stdout]     | ----------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 100 |     pub fn show(&self) {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `get_heuristics` and `get_type` are never used
[INFO] [stdout]   --> src/cell/cell.rs:68:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub trait Cell: Display + Debug + Eq + PartialEq<Self> + PartialOrd<Self> + Ord + Clone {
[INFO] [stdout]    |           ---- methods in this trait
[INFO] [stdout] ...
[INFO] [stdout] 68 |     fn get_heuristics(&self) -> u32;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 72 |     fn get_type(&self) -> u8;
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/backend/file_handler.rs:40:21
[INFO] [stdout]    |
[INFO] [stdout] 40 |                     writer.write(format!("{}", &matrix[(y, x)]).as_ref());
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 40 |                     let _ = writer.write(format!("{}", &matrix[(y, x)]).as_ref());
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/backend/file_handler.rs:41:21
[INFO] [stdout]    |
[INFO] [stdout] 41 |                     writer.write(" ".as_ref());
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 41 |                     let _ = writer.write(" ".as_ref());
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/backend/file_handler.rs:43:17
[INFO] [stdout]    |
[INFO] [stdout] 43 |                 writer.write("\n".as_ref());
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 43 |                 let _ = writer.write("\n".as_ref());
[INFO] [stdout]    |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 8.83s
[INFO] running `Command { std: "docker" "inspect" "7199640d536e84cdb744b439bfd107ec051c6ec898dd3a2d0f5b0d4aa7bc04d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7199640d536e84cdb744b439bfd107ec051c6ec898dd3a2d0f5b0d4aa7bc04d5", kill_on_drop: false }`
[INFO] [stdout] 7199640d536e84cdb744b439bfd107ec051c6ec898dd3a2d0f5b0d4aa7bc04d5