[INFO] updating cached repository mkobzik/chip-8-rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mkobzik/chip-8-rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mkobzik/chip-8-rust" "work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/mkobzik/chip-8-rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/mkobzik/chip-8-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mkobzik/chip-8-rust" "work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/mkobzik/chip-8-rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/mkobzik/chip-8-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d87f81818681ce3889de72294947e2e968447a95
[INFO] sha for GitHub repo mkobzik/chip-8-rust: d87f81818681ce3889de72294947e2e968447a95
[INFO] validating manifest of mkobzik/chip-8-rust on toolchain master#a850a426491e14186af2250549bf41256b5938d2
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of mkobzik/chip-8-rust on toolchain try#06a150c7d11500b41499224f165e9de1de096768
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing mkobzik/chip-8-rust
[INFO] finished frobbing mkobzik/chip-8-rust
[INFO] frobbed toml for mkobzik/chip-8-rust written to work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/mkobzik/chip-8-rust/Cargo.toml
[INFO] started frobbing mkobzik/chip-8-rust
[INFO] finished frobbing mkobzik/chip-8-rust
[INFO] frobbed toml for mkobzik/chip-8-rust written to work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/mkobzik/chip-8-rust/Cargo.toml
[INFO] crate mkobzik/chip-8-rust already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] error: the lock file /mnt/crater-raid/crater/work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/mkobzik/chip-8-rust/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking mkobzik/chip-8-rust against master#a850a426491e14186af2250549bf41256b5938d2 for pr-60162
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-60162/worker-3/master#a850a426491e14186af2250549bf41256b5938d2:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/mkobzik/chip-8-rust:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 47709716a4d5f6a63eda102750c1a458d63ebaea31e311adf992f5584e6f4da7
[INFO] running `"docker" "start" "-a" "47709716a4d5f6a63eda102750c1a458d63ebaea31e311adf992f5584e6f4da7"`
[INFO] [stderr]     Checking chip-8-rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/chip8.rs:118:33
[INFO] [stderr]     |
[INFO] [stderr] 118 |     pub fn add_vx_nn(&mut self, x: u8, nn: u8) {
[INFO] [stderr]     |                                 ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]  --> src/keyboard.rs:1:23
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn is_key_pressed(x: u8) -> bool {
[INFO] [stderr]   |                       ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/chip8.rs:119:13
[INFO] [stderr]     |
[INFO] [stderr] 119 |         let mut vx = &mut self.registers[0];
[INFO] [stderr]     |             ----^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Chip8`
[INFO] [stderr]  --> src/chip8.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub struct Chip8 {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `init`
[INFO] [stderr]   --> src/chip8.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 |     pub fn init() -> Chip8 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `cls`
[INFO] [stderr]   --> src/chip8.rs:33:5
[INFO] [stderr]    |
[INFO] [stderr] 33 |     pub fn cls() {
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `ret`
[INFO] [stderr]   --> src/chip8.rs:37:5
[INFO] [stderr]    |
[INFO] [stderr] 37 |     pub fn ret(&self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `call_nnn`
[INFO] [stderr]   --> src/chip8.rs:42:5
[INFO] [stderr]    |
[INFO] [stderr] 42 |     pub fn call_nnn(&mut self, nnn: u16) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `jp_nnn`
[INFO] [stderr]   --> src/chip8.rs:48:5
[INFO] [stderr]    |
[INFO] [stderr] 48 |     pub fn jp_nnn(&self, nnn: u16) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `jp_v0_nnn`
[INFO] [stderr]   --> src/chip8.rs:52:5
[INFO] [stderr]    |
[INFO] [stderr] 52 |     pub fn jp_v0_nnn(&self, nnn: u16) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `se_vx_nn`
[INFO] [stderr]   --> src/chip8.rs:56:5
[INFO] [stderr]    |
[INFO] [stderr] 56 |     pub fn se_vx_nn(&self, x: u8, nn: u8) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `sne_vx_nn`
[INFO] [stderr]   --> src/chip8.rs:62:5
[INFO] [stderr]    |
[INFO] [stderr] 62 |     pub fn sne_vx_nn(&self, x: u8, nn: u8) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `se_vx_vy`
[INFO] [stderr]   --> src/chip8.rs:68:5
[INFO] [stderr]    |
[INFO] [stderr] 68 |     pub fn se_vx_vy(&self, x: u8, y: u8) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `sne_vx_vy`
[INFO] [stderr]   --> src/chip8.rs:74:5
[INFO] [stderr]    |
[INFO] [stderr] 74 |     pub fn sne_vx_vy(&self, x: u8, y: u8) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `ld_vx_nn`
[INFO] [stderr]   --> src/chip8.rs:80:5
[INFO] [stderr]    |
[INFO] [stderr] 80 |     pub fn ld_vx_nn(&mut self, x: u8, nn: u8) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `ld_vx_vy`
[INFO] [stderr]   --> src/chip8.rs:84:5
[INFO] [stderr]    |
[INFO] [stderr] 84 |     pub fn ld_vx_vy(&mut self, x: u8, y: u8) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `ld_i_nnn`
[INFO] [stderr]   --> src/chip8.rs:88:5
[INFO] [stderr]    |
[INFO] [stderr] 88 |     pub fn ld_i_nnn(&self, nnn: u16) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `ld_vx_dt`
[INFO] [stderr]   --> src/chip8.rs:92:5
[INFO] [stderr]    |
[INFO] [stderr] 92 |     pub fn ld_vx_dt(&mut self, x: u8) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `ld_dt_vx`
[INFO] [stderr]   --> src/chip8.rs:96:5
[INFO] [stderr]    |
[INFO] [stderr] 96 |     pub fn ld_dt_vx(&self, x: u8) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `ld_st_vx`
[INFO] [stderr]    --> src/chip8.rs:100:5
[INFO] [stderr]     |
[INFO] [stderr] 100 |     pub fn ld_st_vx(&self, x: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `ld_vx_i`
[INFO] [stderr]    --> src/chip8.rs:104:5
[INFO] [stderr]     |
[INFO] [stderr] 104 |     pub fn ld_vx_i(&mut self, x: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `ld_i_vx`
[INFO] [stderr]    --> src/chip8.rs:111:5
[INFO] [stderr]     |
[INFO] [stderr] 111 |     pub fn ld_i_vx(&mut self, x: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `add_vx_nn`
[INFO] [stderr]    --> src/chip8.rs:118:5
[INFO] [stderr]     |
[INFO] [stderr] 118 |     pub fn add_vx_nn(&mut self, x: u8, nn: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `add_vx_vy`
[INFO] [stderr]    --> src/chip8.rs:123:5
[INFO] [stderr]     |
[INFO] [stderr] 123 |     pub fn add_vx_vy(&mut self, x: u8, y: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `add_i_vx`
[INFO] [stderr]    --> src/chip8.rs:129:5
[INFO] [stderr]     |
[INFO] [stderr] 129 |     pub fn add_i_vx(&self, x: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `sub_vx_vy`
[INFO] [stderr]    --> src/chip8.rs:133:5
[INFO] [stderr]     |
[INFO] [stderr] 133 |     pub fn sub_vx_vy(&mut self, x: u8, y: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `subn_vx_vy`
[INFO] [stderr]    --> src/chip8.rs:139:5
[INFO] [stderr]     |
[INFO] [stderr] 139 |     pub fn subn_vx_vy(&mut self, x: u8, y: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `or_vx_vy`
[INFO] [stderr]    --> src/chip8.rs:145:5
[INFO] [stderr]     |
[INFO] [stderr] 145 |     pub fn or_vx_vy(&mut self, x: u8, y: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `and_vx_vy`
[INFO] [stderr]    --> src/chip8.rs:149:5
[INFO] [stderr]     |
[INFO] [stderr] 149 |     pub fn and_vx_vy(&mut self, x: u8, y: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `xor_vx_vy`
[INFO] [stderr]    --> src/chip8.rs:153:5
[INFO] [stderr]     |
[INFO] [stderr] 153 |     pub fn xor_vx_vy(&mut self, x: u8, y: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `rnd_vx_nn`
[INFO] [stderr]    --> src/chip8.rs:157:5
[INFO] [stderr]     |
[INFO] [stderr] 157 |     pub fn rnd_vx_nn(&mut self, x: u8, nn: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `shr_vx`
[INFO] [stderr]    --> src/chip8.rs:162:5
[INFO] [stderr]     |
[INFO] [stderr] 162 |     pub fn shr_vx(&mut self, x: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `shl_vx`
[INFO] [stderr]    --> src/chip8.rs:167:5
[INFO] [stderr]     |
[INFO] [stderr] 167 |     pub fn shl_vx(&mut self, x: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `skp_vx`
[INFO] [stderr]    --> src/chip8.rs:172:5
[INFO] [stderr]     |
[INFO] [stderr] 172 |     pub fn skp_vx(&self, x: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `sknp_vx`
[INFO] [stderr]    --> src/chip8.rs:178:5
[INFO] [stderr]     |
[INFO] [stderr] 178 |     pub fn sknp_vx(&self, x: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `ld_vx_k`
[INFO] [stderr]    --> src/chip8.rs:184:5
[INFO] [stderr]     |
[INFO] [stderr] 184 |     pub fn ld_vx_k(&mut self, x: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `is_key_pressed`
[INFO] [stderr]  --> src/keyboard.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn is_key_pressed(x: u8) -> bool {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `wait_for_key_press`
[INFO] [stderr]  --> src/keyboard.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn wait_for_key_press() -> u8 {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `clear`
[INFO] [stderr]  --> src/display.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn clear() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/chip8.rs:118:33
[INFO] [stderr]     |
[INFO] [stderr] 118 |     pub fn add_vx_nn(&mut self, x: u8, nn: u8) {
[INFO] [stderr]     |                                 ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]  --> src/keyboard.rs:1:23
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn is_key_pressed(x: u8) -> bool {
[INFO] [stderr]   |                       ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/chip8.rs:119:13
[INFO] [stderr]     |
[INFO] [stderr] 119 |         let mut vx = &mut self.registers[0];
[INFO] [stderr]     |             ----^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/chip8.rs:235:13
[INFO] [stderr]     |
[INFO] [stderr] 235 |         let mut chip = Chip8::init();
[INFO] [stderr]     |             ----^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/chip8.rs:255:17
[INFO] [stderr]     |
[INFO] [stderr] 255 |             let mut chip = Chip8::init();
[INFO] [stderr]     |                 ----^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/chip8.rs:263:17
[INFO] [stderr]     |
[INFO] [stderr] 263 |             let mut chip = Chip8::init();
[INFO] [stderr]     |                 ----^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/chip8.rs:274:17
[INFO] [stderr]     |
[INFO] [stderr] 274 |             let mut chip = Chip8::init();
[INFO] [stderr]     |                 ----^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/chip8.rs:282:17
[INFO] [stderr]     |
[INFO] [stderr] 282 |             let mut chip = Chip8::init();
[INFO] [stderr]     |                 ----^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/chip8.rs:293:17
[INFO] [stderr]     |
[INFO] [stderr] 293 |             let mut chip = Chip8::init();
[INFO] [stderr]     |                 ----^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/chip8.rs:313:17
[INFO] [stderr]     |
[INFO] [stderr] 313 |             let mut chip = Chip8::init();
[INFO] [stderr]     |                 ----^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/chip8.rs:351:13
[INFO] [stderr]     |
[INFO] [stderr] 351 |         let mut chip = Chip8::init();
[INFO] [stderr]     |             ----^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `cls`
[INFO] [stderr]   --> src/chip8.rs:33:5
[INFO] [stderr]    |
[INFO] [stderr] 33 |     pub fn cls() {
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `rnd_vx_nn`
[INFO] [stderr]    --> src/chip8.rs:157:5
[INFO] [stderr]     |
[INFO] [stderr] 157 |     pub fn rnd_vx_nn(&mut self, x: u8, nn: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `skp_vx`
[INFO] [stderr]    --> src/chip8.rs:172:5
[INFO] [stderr]     |
[INFO] [stderr] 172 |     pub fn skp_vx(&self, x: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `sknp_vx`
[INFO] [stderr]    --> src/chip8.rs:178:5
[INFO] [stderr]     |
[INFO] [stderr] 178 |     pub fn sknp_vx(&self, x: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `ld_vx_k`
[INFO] [stderr]    --> src/chip8.rs:184:5
[INFO] [stderr]     |
[INFO] [stderr] 184 |     pub fn ld_vx_k(&mut self, x: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `is_key_pressed`
[INFO] [stderr]  --> src/keyboard.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn is_key_pressed(x: u8) -> bool {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `wait_for_key_press`
[INFO] [stderr]  --> src/keyboard.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn wait_for_key_press() -> u8 {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `clear`
[INFO] [stderr]  --> src/display.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn clear() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.36s
[INFO] running `"docker" "inspect" "47709716a4d5f6a63eda102750c1a458d63ebaea31e311adf992f5584e6f4da7"`
[INFO] running `"docker" "rm" "-f" "47709716a4d5f6a63eda102750c1a458d63ebaea31e311adf992f5584e6f4da7"`
[INFO] [stdout] 47709716a4d5f6a63eda102750c1a458d63ebaea31e311adf992f5584e6f4da7