[INFO] cloning repository https://github.com/Qubeo/hello-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Qubeo/hello-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FQubeo%2Fhello-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FQubeo%2Fhello-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c9be0e677f4ccde4ba9f006f82a8fafd6a373214
[INFO] checking Qubeo/hello-rust against beta-2020-07-24 for pr-75494-beta
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FQubeo%2Fhello-rust" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Qubeo/hello-rust on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Qubeo/hello-rust
[INFO] finished tweaking git repo https://github.com/Qubeo/hello-rust
[INFO] tweaked toml for git repo https://github.com/Qubeo/hello-rust written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/Qubeo/hello-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serde_json v1.0.34
[INFO] [stderr]   Downloaded thread-id v3.3.0
[INFO] [stderr]   Downloaded serde v1.0.84
[INFO] [stderr]   Downloaded libc v0.2.44
[INFO] [stderr]   Downloaded flamer v0.3.0
[INFO] [stderr]   Downloaded flame v0.2.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] eb1b3239b2a98dd84077987e022d7e8ea9b56982ef33b635109c9399df73443a
[INFO] running `Command { std: "docker" "start" "-a" "eb1b3239b2a98dd84077987e022d7e8ea9b56982ef33b635109c9399df73443a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eb1b3239b2a98dd84077987e022d7e8ea9b56982ef33b635109c9399df73443a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb1b3239b2a98dd84077987e022d7e8ea9b56982ef33b635109c9399df73443a", kill_on_drop: false }`
[INFO] [stdout] eb1b3239b2a98dd84077987e022d7e8ea9b56982ef33b635109c9399df73443a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 0516b4049c32bfb039a9e397f4bd39a35c7ef6d45f75be7162be8ff993068a3f
[INFO] running `Command { std: "docker" "start" "-a" "0516b4049c32bfb039a9e397f4bd39a35c7ef6d45f75be7162be8ff993068a3f", kill_on_drop: false }`
[INFO] [stderr]    Compiling ryu v0.2.7
[INFO] [stderr]    Compiling serde v1.0.84
[INFO] [stderr]    Compiling itoa v0.4.3
[INFO] [stderr]    Compiling proc-macro2 v0.4.24
[INFO] [stderr]    Compiling libc v0.2.44
[INFO] [stderr]     Checking thread-id v3.3.0
[INFO] [stderr]     Checking rand v0.4.3
[INFO] [stderr]    Compiling quote v0.6.10
[INFO] [stderr]    Compiling syn v0.15.24
[INFO] [stderr]     Checking serde_json v1.0.34
[INFO] [stderr]    Compiling serde_derive v1.0.84
[INFO] [stderr]    Compiling flame v0.2.2
[INFO] [stderr]    Compiling flamer v0.3.0
[INFO] [stderr]     Checking hello-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::fmt;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/grid/mod.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Div`
[INFO] [stdout]  --> src/grid/mod.rs:3:32
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::ops::{ Add, Mul, Sub, Div };
[INFO] [stdout]   |                                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `u32ff` should have an upper camel case name
[INFO] [stdout]   --> src/grid/mod.rs:21:12
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub struct u32ff {
[INFO] [stdout]    |            ^^^^^ help: convert the identifier to upper camel case (notice the capitalization): `U32ff`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]   --> src/grid/mod.rs:84:20
[INFO] [stdout]    |
[INFO] [stdout] 84 |                 if (i % 3 == 0) { Cell::Alive } else { Cell::Dead }
[INFO] [stdout]    |                    ^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]    --> src/grid/mod.rs:133:9
[INFO] [stdout]     |
[INFO] [stdout] 133 |           /// @ Q: Complexity: quadratic?
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 134 | /         for i in 1..=self.height-2 {
[INFO] [stdout] 135 | |             for j in 1..=self.width-2 {
[INFO] [stdout] 136 | |                 let mut count = 0;
[INFO] [stdout] 137 | |                 for n in 0..=2 {
[INFO] [stdout] ...   |
[INFO] [stdout] 145 | |             }
[INFO] [stdout] 146 | |         }
[INFO] [stdout]     | |_________- rustdoc does not generate documentation for expressions
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition
[INFO] [stdout]    --> src/grid/mod.rs:179:9
[INFO] [stdout]     |
[INFO] [stdout] 179 |         macro_rules! wrp { ( ($xe:expr, $ye:expr) ) => {  (self.wrap_x($xe), self.wrap_y($ye)) } };
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_macros)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]    --> src/grid/mod.rs:208:9
[INFO] [stdout]     |
[INFO] [stdout] 208 |         ((i % (last_index)) + (last_index) * (i == 0) as u32) // Q: Optimize "j == 0" with some bitwise operator?
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::fmt;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/grid/mod.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Div`
[INFO] [stdout]  --> src/grid/mod.rs:3:32
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::ops::{ Add, Mul, Sub, Div };
[INFO] [stdout]   |                                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `u32ff` should have an upper camel case name
[INFO] [stdout]   --> src/grid/mod.rs:21:12
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub struct u32ff {
[INFO] [stdout]    |            ^^^^^ help: convert the identifier to upper camel case (notice the capitalization): `U32ff`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]   --> src/grid/mod.rs:84:20
[INFO] [stdout]    |
[INFO] [stdout] 84 |                 if (i % 3 == 0) { Cell::Alive } else { Cell::Dead }
[INFO] [stdout]    |                    ^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]    --> src/grid/mod.rs:133:9
[INFO] [stdout]     |
[INFO] [stdout] 133 |           /// @ Q: Complexity: quadratic?
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 134 | /         for i in 1..=self.height-2 {
[INFO] [stdout] 135 | |             for j in 1..=self.width-2 {
[INFO] [stdout] 136 | |                 let mut count = 0;
[INFO] [stdout] 137 | |                 for n in 0..=2 {
[INFO] [stdout] ...   |
[INFO] [stdout] 145 | |             }
[INFO] [stdout] 146 | |         }
[INFO] [stdout]     | |_________- rustdoc does not generate documentation for expressions
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition
[INFO] [stdout]    --> src/grid/mod.rs:179:9
[INFO] [stdout]     |
[INFO] [stdout] 179 |         macro_rules! wrp { ( ($xe:expr, $ye:expr) ) => {  (self.wrap_x($xe), self.wrap_y($ye)) } };
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_macros)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]    --> src/grid/mod.rs:208:9
[INFO] [stdout]     |
[INFO] [stdout] 208 |         ((i % (last_index)) + (last_index) * (i == 0) as u32) // Q: Optimize "j == 0" with some bitwise operator?
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/main.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     for i in 0..=4 {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/grid/mod.rs:122:44
[INFO] [stdout]     |
[INFO] [stdout] 122 |     pub fn count_alive_neighbors_0(&self, (x, y): (u32, u32)) -> u8 {
[INFO] [stdout]     |                                            ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/grid/mod.rs:122:47
[INFO] [stdout]     |
[INFO] [stdout] 122 |     pub fn count_alive_neighbors_0(&self, (x, y): (u32, u32)) -> u8 {
[INFO] [stdout]     |                                               ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]    --> src/grid/mod.rs:155:13
[INFO] [stdout]     |
[INFO] [stdout] 155 | ...   let a: () = self.cells.iter_mut().enumerate()                 // Type () as we don't actually map and use the collected items, we j...
[INFO] [stdout]     |           ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `count`
[INFO] [stdout]    --> src/grid/mod.rs:182:13
[INFO] [stdout]     |
[INFO] [stdout] 182 |         let mut count = 0;
[INFO] [stdout]     |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_count`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/grid/mod.rs:177:44
[INFO] [stdout]     |
[INFO] [stdout] 177 |     pub fn count_alive_neighbors_1(&self, (x, y): (u32, u32)) -> u8 {
[INFO] [stdout]     |                                            ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/grid/mod.rs:177:47
[INFO] [stdout]     |
[INFO] [stdout] 177 |     pub fn count_alive_neighbors_1(&self, (x, y): (u32, u32)) -> u8 {
[INFO] [stdout]     |                                               ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `j` is assigned to, but never used
[INFO] [stdout]    --> src/grid/mod.rs:216:13
[INFO] [stdout]     |
[INFO] [stdout] 216 |         let mut j: u32 = 0;
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_j` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/grid/mod.rs:219:14
[INFO] [stdout]     |
[INFO] [stdout] 219 |         for (i, line) in self.cells.as_slice().chunks(self.width as usize).enumerate() {
[INFO] [stdout]     |              ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/grid/mod.rs:98:13
[INFO] [stdout]    |
[INFO] [stdout] 98 |         let mut nm = self.compute_neighbor_matrix_0();
[INFO] [stdout]    |             ----^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/main.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     for i in 0..=4 {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/grid/mod.rs:122:44
[INFO] [stdout]     |
[INFO] [stdout] 122 |     pub fn count_alive_neighbors_0(&self, (x, y): (u32, u32)) -> u8 {
[INFO] [stdout]     |                                            ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/grid/mod.rs:122:47
[INFO] [stdout]     |
[INFO] [stdout] 122 |     pub fn count_alive_neighbors_0(&self, (x, y): (u32, u32)) -> u8 {
[INFO] [stdout]     |                                               ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]    --> src/grid/mod.rs:155:13
[INFO] [stdout]     |
[INFO] [stdout] 155 | ...   let a: () = self.cells.iter_mut().enumerate()                 // Type () as we don't actually map and use the collected items, we j...
[INFO] [stdout]     |           ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `count`
[INFO] [stdout]    --> src/grid/mod.rs:182:13
[INFO] [stdout]     |
[INFO] [stdout] 182 |         let mut count = 0;
[INFO] [stdout]     |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_count`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/grid/mod.rs:177:44
[INFO] [stdout]     |
[INFO] [stdout] 177 |     pub fn count_alive_neighbors_1(&self, (x, y): (u32, u32)) -> u8 {
[INFO] [stdout]     |                                            ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/grid/mod.rs:177:47
[INFO] [stdout]     |
[INFO] [stdout] 177 |     pub fn count_alive_neighbors_1(&self, (x, y): (u32, u32)) -> u8 {
[INFO] [stdout]     |                                               ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `j` is assigned to, but never used
[INFO] [stdout]    --> src/grid/mod.rs:216:13
[INFO] [stdout]     |
[INFO] [stdout] 216 |         let mut j: u32 = 0;
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_j` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/grid/mod.rs:219:14
[INFO] [stdout]     |
[INFO] [stdout] 219 |         for (i, line) in self.cells.as_slice().chunks(self.width as usize).enumerate() {
[INFO] [stdout]     |              ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/grid/mod.rs:182:13
[INFO] [stdout]     |
[INFO] [stdout] 182 |         let mut count = 0;
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `render`
[INFO] [stdout]    --> src/grid/mod.rs:103:12
[INFO] [stdout]     |
[INFO] [stdout] 103 |     pub fn render(&self) -> String {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_x_y`
[INFO] [stdout]    --> src/grid/mod.rs:115:12
[INFO] [stdout]     |
[INFO] [stdout] 115 |     pub fn get_x_y(&self, index: u32) -> (u32, u32) {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `count_alive_neighbors_0`
[INFO] [stdout]    --> src/grid/mod.rs:122:12
[INFO] [stdout]     |
[INFO] [stdout] 122 |     pub fn count_alive_neighbors_0(&self, (x, y): (u32, u32)) -> u8 {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tick_neighbor_matrix_0`
[INFO] [stdout]    --> src/grid/mod.rs:154:8
[INFO] [stdout]     |
[INFO] [stdout] 154 |     fn tick_neighbor_matrix_0(&mut self, alive_neighbor_matrix: Vec<u8>) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `count_alive_neighbors_1`
[INFO] [stdout]    --> src/grid/mod.rs:177:12
[INFO] [stdout]     |
[INFO] [stdout] 177 |     pub fn count_alive_neighbors_1(&self, (x, y): (u32, u32)) -> u8 {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `wrap_x`
[INFO] [stdout]    --> src/grid/mod.rs:199:8
[INFO] [stdout]     |
[INFO] [stdout] 199 |     fn wrap_x(&self, x: u32) -> u32 {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `wrap_y`
[INFO] [stdout]    --> src/grid/mod.rs:203:8
[INFO] [stdout]     |
[INFO] [stdout] 203 |     fn wrap_y(&self, y: u32) -> u32 {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `wrap`
[INFO] [stdout]    --> src/grid/mod.rs:207:8
[INFO] [stdout]     |
[INFO] [stdout] 207 |     fn wrap(i: u32, last_index: u32) -> u32 {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/grid/mod.rs:98:13
[INFO] [stdout]    |
[INFO] [stdout] 98 |         let mut nm = self.compute_neighbor_matrix_0();
[INFO] [stdout]    |             ----^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/grid/mod.rs:222:17
[INFO] [stdout]     |
[INFO] [stdout] 222 |                 write!(f, "{:} ", symbol); 
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/grid/mod.rs:182:13
[INFO] [stdout]     |
[INFO] [stdout] 182 |         let mut count = 0;
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `render`
[INFO] [stdout]    --> src/grid/mod.rs:103:12
[INFO] [stdout]     |
[INFO] [stdout] 103 |     pub fn render(&self) -> String {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_x_y`
[INFO] [stdout]    --> src/grid/mod.rs:115:12
[INFO] [stdout]     |
[INFO] [stdout] 115 |     pub fn get_x_y(&self, index: u32) -> (u32, u32) {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `count_alive_neighbors_0`
[INFO] [stdout]    --> src/grid/mod.rs:122:12
[INFO] [stdout]     |
[INFO] [stdout] 122 |     pub fn count_alive_neighbors_0(&self, (x, y): (u32, u32)) -> u8 {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tick_neighbor_matrix_0`
[INFO] [stdout]    --> src/grid/mod.rs:154:8
[INFO] [stdout]     |
[INFO] [stdout] 154 |     fn tick_neighbor_matrix_0(&mut self, alive_neighbor_matrix: Vec<u8>) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `count_alive_neighbors_1`
[INFO] [stdout]    --> src/grid/mod.rs:177:12
[INFO] [stdout]     |
[INFO] [stdout] 177 |     pub fn count_alive_neighbors_1(&self, (x, y): (u32, u32)) -> u8 {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `wrap_x`
[INFO] [stdout]    --> src/grid/mod.rs:199:8
[INFO] [stdout]     |
[INFO] [stdout] 199 |     fn wrap_x(&self, x: u32) -> u32 {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `wrap_y`
[INFO] [stdout]    --> src/grid/mod.rs:203:8
[INFO] [stdout]     |
[INFO] [stdout] 203 |     fn wrap_y(&self, y: u32) -> u32 {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `wrap`
[INFO] [stdout]    --> src/grid/mod.rs:207:8
[INFO] [stdout]     |
[INFO] [stdout] 207 |     fn wrap(i: u32, last_index: u32) -> u32 {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 29 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/grid/mod.rs:222:17
[INFO] [stdout]     |
[INFO] [stdout] 222 |                 write!(f, "{:} ", symbol); 
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 29 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 54.93s
[INFO] running `Command { std: "docker" "inspect" "0516b4049c32bfb039a9e397f4bd39a35c7ef6d45f75be7162be8ff993068a3f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0516b4049c32bfb039a9e397f4bd39a35c7ef6d45f75be7162be8ff993068a3f", kill_on_drop: false }`
[INFO] [stdout] 0516b4049c32bfb039a9e397f4bd39a35c7ef6d45f75be7162be8ff993068a3f
