[INFO] cloning repository https://github.com/tlehman/gogame
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tlehman/gogame" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftlehman%2Fgogame", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftlehman%2Fgogame'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 13b2e1aba16fa8bb1eee115933bdd5f194c2ebaa
[INFO] checking tlehman/gogame against master#4b9792692fbb675174d4d2082e7c37b2bc930e71 for pr-153692-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftlehman%2Fgogame" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/tlehman/gogame
[INFO] finished tweaking git repo https://github.com/tlehman/gogame
[INFO] tweaked toml for git repo https://github.com/tlehman/gogame written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/tlehman/gogame on toolchain 4b9792692fbb675174d4d2082e7c37b2bc930e71
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4b9792692fbb675174d4d2082e7c37b2bc930e71" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/tlehman/gogame 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" "+4b9792692fbb675174d4d2082e7c37b2bc930e71" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+4b9792692fbb675174d4d2082e7c37b2bc930e71" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] de0b555109ff621ea283fb3f2f9fb0aa01de2f4852b2e0aae98553829b8cdb20
[INFO] running `Command { std: "docker" "start" "-a" "de0b555109ff621ea283fb3f2f9fb0aa01de2f4852b2e0aae98553829b8cdb20", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "de0b555109ff621ea283fb3f2f9fb0aa01de2f4852b2e0aae98553829b8cdb20", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de0b555109ff621ea283fb3f2f9fb0aa01de2f4852b2e0aae98553829b8cdb20", kill_on_drop: false }`
[INFO] [stdout] de0b555109ff621ea283fb3f2f9fb0aa01de2f4852b2e0aae98553829b8cdb20
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+4b9792692fbb675174d4d2082e7c37b2bc930e71" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 533c79b4db036cdc7065a15d76ce149b688157690dc887b356d45308a4e235f1
[INFO] running `Command { std: "docker" "start" "-a" "533c79b4db036cdc7065a15d76ce149b688157690dc887b356d45308a4e235f1", kill_on_drop: false }`
[INFO] [stderr]     Checking gogame v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0170]: pattern binding `Empty` is named the same as one of the variants of the type `Color`
[INFO] [stdout]   --> src/main.rs:36:36
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                    ^^^^^ help: to match on the variant, qualify the path: `Color::Empty`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[deny(bindings_with_variant_name)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0170]: pattern binding `White` is named the same as one of the variants of the type `Color`
[INFO] [stdout]   --> src/main.rs:36:49
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                                 ^^^^^ help: to match on the variant, qualify the path: `Color::White`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0170]: pattern binding `Black` is named the same as one of the variants of the type `Color`
[INFO] [stdout]   --> src/main.rs:36:67
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                                                   ^^^^^ help: to match on the variant, qualify the path: `Color::Black`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/main.rs:36:49
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                    -----        ^^^^^ no value can reach this
[INFO] [stdout]    |                                    |
[INFO] [stdout]    |                                    matches any value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/main.rs:36:67
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                    ----- matches any value        ^^^^^ no value can reach this
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Empty`
[INFO] [stdout]   --> src/main.rs:36:36
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: you might have meant to pattern match on the similarly named variant `Empty`
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Color::Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                    +++++++
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { _Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                    +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `White`
[INFO] [stdout]   --> src/main.rs:36:49
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                                 ^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: you might have meant to pattern match on the similarly named variant `White`
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", Color::White => "white", Black => "black", };
[INFO] [stdout]    |                                                 +++++++
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", _White => "white", Black => "black", };
[INFO] [stdout]    |                                                 +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Black`
[INFO] [stdout]   --> src/main.rs:36:67
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                                                   ^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: you might have meant to pattern match on the similarly named variant `Black`
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Color::Black => "black", };
[INFO] [stdout]    |                                                                   +++++++
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", _Black => "black", };
[INFO] [stdout]    |                                                                   +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `to_add_node` is never read
[INFO] [stdout]   --> src/main.rs:95:17
[INFO] [stdout]    |
[INFO] [stdout] 95 |                 to_add_node = false;
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Empty` is never constructed
[INFO] [stdout]  --> src/main.rs:8:14
[INFO] [stdout]   |
[INFO] [stdout] 8 | enum Color { Empty, Black, White }
[INFO] [stdout]   |      -----   ^^^^^
[INFO] [stdout]   |      |
[INFO] [stdout]   |      variant in this enum
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Color` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `find_component_containing`, `add_edge_black`, and `add_edge_white` are never used
[INFO] [stdout]    --> src/main.rs:119:8
[INFO] [stdout]     |
[INFO] [stdout]  66 | impl Graph {
[INFO] [stdout]     | ---------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 119 |     fn find_component_containing(&mut self, u: Node) -> HashSet<Node> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 156 |     fn add_edge_black(&mut self, src: (i16, i16), dst: (i16, i16)) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 168 |     fn add_edge_white(&mut self, src: (i16, i16), dst: (i16, i16)) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `find_component_doubleton` is never used
[INFO] [stdout]    --> src/main.rs:263:4
[INFO] [stdout]     |
[INFO] [stdout] 263 | fn find_component_doubleton() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Empty` should have a snake case name
[INFO] [stdout]   --> src/main.rs:36:36
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                    ^^^^^ help: convert the identifier to snake case: `empty`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `White` should have a snake case name
[INFO] [stdout]   --> src/main.rs:36:49
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                                 ^^^^^ help: convert the identifier to snake case (notice the capitalization): `white`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Black` should have a snake case name
[INFO] [stdout]   --> src/main.rs:36:67
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                                                   ^^^^^ help: convert the identifier to snake case: `black`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 49 |         write!(f, "\"({},{})\" [pos=\"{},{}!\"", self.x, self.y, self.x, self.y);
[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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 49 |         let _ = write!(f, "\"({},{})\" [pos=\"{},{}!\"", self.x, self.y, self.x, self.y);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:50:9
[INFO] [stdout]    |
[INFO] [stdout] 50 | /         match self.c {
[INFO] [stdout] 51 | |             Color::Black => write!(f, ",style=filled,fillcolor=\"#666666\"];"),
[INFO] [stdout] 52 | |             Color::White => write!(f, ",style=filled,fillcolor=\"white\"];"),
[INFO] [stdout] 53 | |             Color::Empty => write!(f, "];")
[INFO] [stdout] 54 | |         };
[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] 50 |         let _ = match self.c {
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:184:9
[INFO] [stdout]     |
[INFO] [stdout] 184 |         write!(f, "graph {{\n");
[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] 184 |         let _ = write!(f, "graph {{\n");
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:186:13
[INFO] [stdout]     |
[INFO] [stdout] 186 |             write!(f, "{}\n", self.nodes[i]);
[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] 186 |             let _ = write!(f, "{}\n", self.nodes[i]);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:189:13
[INFO] [stdout]     |
[INFO] [stdout] 189 |             write!(f, "{}\n", self.edges[i]);
[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] 189 |             let _ = write!(f, "{}\n", self.edges[i]);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0170`.
[INFO] [stdout] 
[INFO] [stdout] error[E0170]: pattern binding `Empty` is named the same as one of the variants of the type `Color`
[INFO] [stdout]   --> src/main.rs:36:36
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                    ^^^^^ help: to match on the variant, qualify the path: `Color::Empty`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[deny(bindings_with_variant_name)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0170]: pattern binding `White` is named the same as one of the variants of the type `Color`
[INFO] [stdout]   --> src/main.rs:36:49
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                                 ^^^^^ help: to match on the variant, qualify the path: `Color::White`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0170]: pattern binding `Black` is named the same as one of the variants of the type `Color`
[INFO] [stdout]   --> src/main.rs:36:67
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                                                   ^^^^^ help: to match on the variant, qualify the path: `Color::Black`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/main.rs:36:49
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                    -----        ^^^^^ no value can reach this
[INFO] [stdout]    |                                    |
[INFO] [stdout]    |                                    matches any value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/main.rs:36:67
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                    ----- matches any value        ^^^^^ no value can reach this
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Empty`
[INFO] [stdout]   --> src/main.rs:36:36
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: you might have meant to pattern match on the similarly named variant `Empty`
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Color::Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                    +++++++
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { _Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                    +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `White`
[INFO] [stdout]   --> src/main.rs:36:49
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                                 ^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: you might have meant to pattern match on the similarly named variant `White`
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", Color::White => "white", Black => "black", };
[INFO] [stdout]    |                                                 +++++++
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", _White => "white", Black => "black", };
[INFO] [stdout]    |                                                 +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Black`
[INFO] [stdout]   --> src/main.rs:36:67
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                                                   ^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: you might have meant to pattern match on the similarly named variant `Black`
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Color::Black => "black", };
[INFO] [stdout]    |                                                                   +++++++
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", _Black => "black", };
[INFO] [stdout]    |                                                                   +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `gogame` (bin "gogame" test) due to 3 previous errors; 17 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: value assigned to `to_add_node` is never read
[INFO] [stdout]   --> src/main.rs:95:17
[INFO] [stdout]    |
[INFO] [stdout] 95 |                 to_add_node = false;
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Empty` is never constructed
[INFO] [stdout]  --> src/main.rs:8:14
[INFO] [stdout]   |
[INFO] [stdout] 8 | enum Color { Empty, Black, White }
[INFO] [stdout]   |      -----   ^^^^^
[INFO] [stdout]   |      |
[INFO] [stdout]   |      variant in this enum
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Color` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `contained_in` is never used
[INFO] [stdout]   --> src/main.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn contained_in(n: &Node, v: &VecDeque<Node>) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `neighbors_of`, `find_component_containing`, `add_edge_black`, and `add_edge_white` are never used
[INFO] [stdout]    --> src/main.rs:71:8
[INFO] [stdout]     |
[INFO] [stdout]  66 | impl Graph {
[INFO] [stdout]     | ---------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout]  71 |     fn neighbors_of(&self, n: Node) -> Vec<Node> {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 119 |     fn find_component_containing(&mut self, u: Node) -> HashSet<Node> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 156 |     fn add_edge_black(&mut self, src: (i16, i16), dst: (i16, i16)) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 168 |     fn add_edge_white(&mut self, src: (i16, i16), dst: (i16, i16)) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `find_component_doubleton` is never used
[INFO] [stdout]    --> src/main.rs:263:4
[INFO] [stdout]     |
[INFO] [stdout] 263 | fn find_component_doubleton() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Empty` should have a snake case name
[INFO] [stdout]   --> src/main.rs:36:36
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                    ^^^^^ help: convert the identifier to snake case: `empty`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `White` should have a snake case name
[INFO] [stdout]   --> src/main.rs:36:49
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                                 ^^^^^ help: convert the identifier to snake case (notice the capitalization): `white`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Black` should have a snake case name
[INFO] [stdout]   --> src/main.rs:36:67
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stdout]    |                                                                   ^^^^^ help: convert the identifier to snake case: `black`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 49 |         write!(f, "\"({},{})\" [pos=\"{},{}!\"", self.x, self.y, self.x, self.y);
[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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 49 |         let _ = write!(f, "\"({},{})\" [pos=\"{},{}!\"", self.x, self.y, self.x, self.y);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:50:9
[INFO] [stdout]    |
[INFO] [stdout] 50 | /         match self.c {
[INFO] [stdout] 51 | |             Color::Black => write!(f, ",style=filled,fillcolor=\"#666666\"];"),
[INFO] [stdout] 52 | |             Color::White => write!(f, ",style=filled,fillcolor=\"white\"];"),
[INFO] [stdout] 53 | |             Color::Empty => write!(f, "];")
[INFO] [stdout] 54 | |         };
[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] 50 |         let _ = match self.c {
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:184:9
[INFO] [stdout]     |
[INFO] [stdout] 184 |         write!(f, "graph {{\n");
[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] 184 |         let _ = write!(f, "graph {{\n");
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:186:13
[INFO] [stdout]     |
[INFO] [stdout] 186 |             write!(f, "{}\n", self.nodes[i]);
[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] 186 |             let _ = write!(f, "{}\n", self.nodes[i]);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:189:13
[INFO] [stdout]     |
[INFO] [stdout] 189 |             write!(f, "{}\n", self.edges[i]);
[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] 189 |             let _ = write!(f, "{}\n", self.edges[i]);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0170`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `gogame` (bin "gogame") due to 3 previous errors; 18 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "533c79b4db036cdc7065a15d76ce149b688157690dc887b356d45308a4e235f1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "533c79b4db036cdc7065a15d76ce149b688157690dc887b356d45308a4e235f1", kill_on_drop: false }`
[INFO] [stdout] 533c79b4db036cdc7065a15d76ce149b688157690dc887b356d45308a4e235f1
