[INFO] cloning repository https://github.com/tlehman/gogame
[INFO] running `"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"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftlehman%2Fgogame'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 13b2e1aba16fa8bb1eee115933bdd5f194c2ebaa
[INFO] checking tlehman/gogame against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftlehman%2Fgogame" "/workspace/builds/worker-9/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tlehman/gogame on toolchain e4dba30b9b475d8750370c4dfb49b6541990904d
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "read-manifest" "--manifest-path" "Cargo.toml"`
[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-9/source/Cargo.toml
[INFO] crate git repo https://github.com/tlehman/gogame already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] d3de112d9f9c93c748fda2e1504839743efd1f7e0520d5a54c5317caa7c6ece0
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "d3de112d9f9c93c748fda2e1504839743efd1f7e0520d5a54c5317caa7c6ece0"`
[INFO] [stderr]     Checking gogame v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning[E0170]: pattern binding `Empty` is named the same as one of the variants of the type `Color`
[INFO] [stderr]   --> src/main.rs:36:36
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stderr]    |                                    ^^^^^ help: to match on the variant, qualify the path: `Color::Empty`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bindings_with_variant_name)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `White` is named the same as one of the variants of the type `Color`
[INFO] [stderr]   --> src/main.rs:36:49
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stderr]    |                                                 ^^^^^ help: to match on the variant, qualify the path: `Color::White`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `Black` is named the same as one of the variants of the type `Color`
[INFO] [stderr]   --> src/main.rs:36:67
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stderr]    |                                                                   ^^^^^ help: to match on the variant, qualify the path: `Color::Black`
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable pattern
[INFO] [stderr]   --> src/main.rs:36:49
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stderr]    |                                    -----        ^^^^^ unreachable pattern
[INFO] [stderr]    |                                    |
[INFO] [stderr]    |                                    matches any value
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable pattern
[INFO] [stderr]   --> src/main.rs:36:67
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stderr]    |                                    ----- matches any value        ^^^^^ unreachable pattern
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `Empty`
[INFO] [stderr]   --> src/main.rs:36:36
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stderr]    |                                    ^^^^^ help: if this is intentional, prefix it with an underscore: `_Empty`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `White`
[INFO] [stderr]   --> src/main.rs:36:49
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stderr]    |                                                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_White`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `Black`
[INFO] [stderr]   --> src/main.rs:36:67
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stderr]    |                                                                   ^^^^^ help: if this is intentional, prefix it with an underscore: `_Black`
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `to_add_node` is never read
[INFO] [stderr]   --> src/main.rs:95:17
[INFO] [stderr]    |
[INFO] [stderr] 95 |                 to_add_node = false;
[INFO] [stderr]    |                 ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `Empty` is named the same as one of the variants of the type `Color`
[INFO] [stderr]   --> src/main.rs:36:36
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stderr]    |                                    ^^^^^ help: to match on the variant, qualify the path: `Color::Empty`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bindings_with_variant_name)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `White` is named the same as one of the variants of the type `Color`
[INFO] [stderr]   --> src/main.rs:36:49
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stderr]    |                                                 ^^^^^ help: to match on the variant, qualify the path: `Color::White`
[INFO] [stderr] 
[INFO] [stderr] warning[E0170]: pattern binding `Black` is named the same as one of the variants of the type `Color`
[INFO] [stderr]   --> src/main.rs:36:67
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stderr]    |                                                                   ^^^^^ help: to match on the variant, qualify the path: `Color::Black`
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable pattern
[INFO] [stderr]   --> src/main.rs:36:49
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stderr]    |                                    -----        ^^^^^ unreachable pattern
[INFO] [stderr]    |                                    |
[INFO] [stderr]    |                                    matches any value
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable pattern
[INFO] [stderr]   --> src/main.rs:36:67
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stderr]    |                                    ----- matches any value        ^^^^^ unreachable pattern
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `Empty`
[INFO] [stderr]   --> src/main.rs:36:36
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stderr]    |                                    ^^^^^ help: if this is intentional, prefix it with an underscore: `_Empty`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `White`
[INFO] [stderr]   --> src/main.rs:36:49
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stderr]    |                                                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_White`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `Black`
[INFO] [stderr]   --> src/main.rs:36:67
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stderr]    |                                                                   ^^^^^ help: if this is intentional, prefix it with an underscore: `_Black`
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `to_add_node` is never read
[INFO] [stderr]   --> src/main.rs:95:17
[INFO] [stderr]    |
[INFO] [stderr] 95 |                 to_add_node = false;
[INFO] [stderr]    |                 ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Empty`
[INFO] [stderr]  --> src/main.rs:8:14
[INFO] [stderr]   |
[INFO] [stderr] 8 | enum Color { Empty, Black, White }
[INFO] [stderr]   |              ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `contained_in`
[INFO] [stderr]   --> src/main.rs:20:4
[INFO] [stderr]    |
[INFO] [stderr] 20 | fn contained_in(n: &Node, v: &VecDeque<Node>) -> bool {
[INFO] [stderr]    |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `neighbors_of`
[INFO] [stderr]   --> src/main.rs:71:5
[INFO] [stderr]    |
[INFO] [stderr] 71 |     fn neighbors_of(&self, n: Node) -> Vec<Node> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `find_component_containing`
[INFO] [stderr]    --> src/main.rs:119:5
[INFO] [stderr]     |
[INFO] [stderr] 119 |     fn find_component_containing(&mut self, u: Node) -> HashSet<Node> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `add_edge_black`
[INFO] [stderr]    --> src/main.rs:156:5
[INFO] [stderr]     |
[INFO] [stderr] 156 |     fn add_edge_black(&mut self, src: (i16, i16), dst: (i16, i16)) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `add_edge_white`
[INFO] [stderr]    --> src/main.rs:168:5
[INFO] [stderr]     |
[INFO] [stderr] 168 |     fn add_edge_white(&mut self, src: (i16, i16), dst: (i16, i16)) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `find_component_doubleton`
[INFO] [stderr]    --> src/main.rs:263:4
[INFO] [stderr]     |
[INFO] [stderr] 263 | fn find_component_doubleton() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable `Empty` should have a snake case name
[INFO] [stderr]   --> src/main.rs:36:36
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stderr]    |                                    ^^^^^ help: convert the identifier to snake case: `empty`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `White` should have a snake case name
[INFO] [stderr]   --> src/main.rs:36:49
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stderr]    |                                                 ^^^^^ help: convert the identifier to snake case (notice the capitalization): `white`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `Black` should have a snake case name
[INFO] [stderr]   --> src/main.rs:36:67
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stderr]    |                                                                   ^^^^^ help: convert the identifier to snake case: `black`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:49:9
[INFO] [stderr]    |
[INFO] [stderr] 49 |         write!(f, "\"({},{})\" [pos=\"{},{}!\"", self.x, self.y, self.x, self.y);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:50:9
[INFO] [stderr]    |
[INFO] [stderr] 50 | /         match self.c {
[INFO] [stderr] 51 | |             Color::Black => write!(f, ",style=filled,fillcolor=\"#666666\"];"),
[INFO] [stderr] 52 | |             Color::White => write!(f, ",style=filled,fillcolor=\"white\"];"),
[INFO] [stderr] 53 | |             Color::Empty => write!(f, "];")
[INFO] [stderr] 54 | |         };
[INFO] [stderr]    | |__________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:184:9
[INFO] [stderr]     |
[INFO] [stderr] 184 |         write!(f, "graph {{\n");
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:186:13
[INFO] [stderr]     |
[INFO] [stderr] 186 |             write!(f, "{}\n", self.nodes[i]);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:189:13
[INFO] [stderr]     |
[INFO] [stderr] 189 |             write!(f, "{}\n", self.edges[i]);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: 24 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0170`.
[INFO] [stderr] warning: variant is never constructed: `Empty`
[INFO] [stderr]  --> src/main.rs:8:14
[INFO] [stderr]   |
[INFO] [stderr] 8 | enum Color { Empty, Black, White }
[INFO] [stderr]   |              ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `find_component_containing`
[INFO] [stderr]    --> src/main.rs:119:5
[INFO] [stderr]     |
[INFO] [stderr] 119 |     fn find_component_containing(&mut self, u: Node) -> HashSet<Node> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `add_edge_black`
[INFO] [stderr]    --> src/main.rs:156:5
[INFO] [stderr]     |
[INFO] [stderr] 156 |     fn add_edge_black(&mut self, src: (i16, i16), dst: (i16, i16)) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `add_edge_white`
[INFO] [stderr]    --> src/main.rs:168:5
[INFO] [stderr]     |
[INFO] [stderr] 168 |     fn add_edge_white(&mut self, src: (i16, i16), dst: (i16, i16)) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `find_component_doubleton`
[INFO] [stderr]    --> src/main.rs:263:4
[INFO] [stderr]     |
[INFO] [stderr] 263 | fn find_component_doubleton() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable `Empty` should have a snake case name
[INFO] [stderr]   --> src/main.rs:36:36
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stderr]    |                                    ^^^^^ help: convert the identifier to snake case: `empty`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `White` should have a snake case name
[INFO] [stderr]   --> src/main.rs:36:49
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stderr]    |                                                 ^^^^^ help: convert the identifier to snake case (notice the capitalization): `white`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `Black` should have a snake case name
[INFO] [stderr]   --> src/main.rs:36:67
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let s: &str = match self { Empty => "", White => "white", Black => "black", };
[INFO] [stderr]    |                                                                   ^^^^^ help: convert the identifier to snake case: `black`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:49:9
[INFO] [stderr]    |
[INFO] [stderr] 49 |         write!(f, "\"({},{})\" [pos=\"{},{}!\"", self.x, self.y, self.x, self.y);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:50:9
[INFO] [stderr]    |
[INFO] [stderr] 50 | /         match self.c {
[INFO] [stderr] 51 | |             Color::Black => write!(f, ",style=filled,fillcolor=\"#666666\"];"),
[INFO] [stderr] 52 | |             Color::White => write!(f, ",style=filled,fillcolor=\"white\"];"),
[INFO] [stderr] 53 | |             Color::Empty => write!(f, "];")
[INFO] [stderr] 54 | |         };
[INFO] [stderr]    | |__________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:184:9
[INFO] [stderr]     |
[INFO] [stderr] 184 |         write!(f, "graph {{\n");
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:186:13
[INFO] [stderr]     |
[INFO] [stderr] 186 |             write!(f, "{}\n", self.nodes[i]);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:189:13
[INFO] [stderr]     |
[INFO] [stderr] 189 |             write!(f, "{}\n", self.edges[i]);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: 22 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0170`.
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.46s
[INFO] running `"docker" "inspect" "d3de112d9f9c93c748fda2e1504839743efd1f7e0520d5a54c5317caa7c6ece0"`
[INFO] running `"docker" "rm" "-f" "d3de112d9f9c93c748fda2e1504839743efd1f7e0520d5a54c5317caa7c6ece0"`
[INFO] [stdout] d3de112d9f9c93c748fda2e1504839743efd1f7e0520d5a54c5317caa7c6ece0