[INFO] updating cached repository jsultond/chip8Rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jsultond/chip8Rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jsultond/chip8Rust" "work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/jsultond/chip8Rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/jsultond/chip8Rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jsultond/chip8Rust" "work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/jsultond/chip8Rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/jsultond/chip8Rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2400c159f4a215a9af9597c00d7a7b5fd34818d6
[INFO] sha for GitHub repo jsultond/chip8Rust: 2400c159f4a215a9af9597c00d7a7b5fd34818d6
[INFO] validating manifest of jsultond/chip8Rust on toolchain master#60960a260f7b5c695fd0717311d72ce62dd4eb43
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of jsultond/chip8Rust on toolchain try#266783e4e09e4e9d5307c1c8e695659c58bbcac7
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing jsultond/chip8Rust
[INFO] finished frobbing jsultond/chip8Rust
[INFO] frobbed toml for jsultond/chip8Rust written to work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/jsultond/chip8Rust/Cargo.toml
[INFO] started frobbing jsultond/chip8Rust
[INFO] finished frobbing jsultond/chip8Rust
[INFO] frobbed toml for jsultond/chip8Rust written to work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/jsultond/chip8Rust/Cargo.toml
[INFO] crate jsultond/chip8Rust already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] checking jsultond/chip8Rust against master#60960a260f7b5c695fd0717311d72ce62dd4eb43 for pr-63376
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63376/worker-0/master#60960a260f7b5c695fd0717311d72ce62dd4eb43:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/jsultond/chip8Rust:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/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" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 7eed9a6df1b1ac5a267ccd445eab41d45b76b3fceebc5d0a08ed383c7c6479e9
[INFO] running `"docker" "start" "-a" "7eed9a6df1b1ac5a267ccd445eab41d45b76b3fceebc5d0a08ed383c7c6479e9"`
[INFO] [stderr]     Checking sdl2-sys v0.8.1
[INFO] [stderr]     Checking sdl2 v0.14.0
[INFO] [stderr]     Checking chip8rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: type `screen` should have an upper camel case name
[INFO] [stderr]  --> src/screen.rs:9:12
[INFO] [stderr]   |
[INFO] [stderr] 9 | pub struct screen {
[INFO] [stderr]   |            ^^^^^^ help: convert the identifier to upper camel case: `Screen`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_1` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     key_1 = 0,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `Key1`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_2` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     key_2,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `Key2`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_3` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     key_3,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `Key3`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_4` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 |     key_4,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `Key4`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_Q` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 |     key_Q,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyQ`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_W` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     key_W,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyW`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_E` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     key_E,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyE`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_R` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     key_R,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyR`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_A` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 |     key_A,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyA`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_S` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 |     key_S,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyS`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_D` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:21:5
[INFO] [stderr]    |
[INFO] [stderr] 21 |     key_D,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyD`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_F` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:22:5
[INFO] [stderr]    |
[INFO] [stderr] 22 |     key_F,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyF`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_Z` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     key_Z,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyZ`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_X` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 |     key_X,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyX`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_C` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 |     key_C,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyC`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_V` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 |     key_V,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyV`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/Cpu.rs:267:16
[INFO] [stderr]     |
[INFO] [stderr] 267 |                        let x = self.vreg[vx as usize] as u16 + i as u16;
[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: `y`
[INFO] [stderr]    --> src/Cpu.rs:268:19
[INFO] [stderr]     |
[INFO] [stderr] 268 |                        let y = self.vreg[vy as usize] as u16 + i as u16;
[INFO] [stderr]     |                            ^ help: consider prefixing with an underscore: `_y`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/Cpu.rs:278:15
[INFO] [stderr]     |
[INFO] [stderr] 278 |                 let x = (self.opcode & 0x0F00) >> 8;
[INFO] [stderr]     |                     ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: type `screen` should have an upper camel case name
[INFO] [stderr]  --> src/screen.rs:9:12
[INFO] [stderr]   |
[INFO] [stderr] 9 | pub struct screen {
[INFO] [stderr]   |            ^^^^^^ help: convert the identifier to upper camel case: `Screen`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_1` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     key_1 = 0,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `Key1`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_2` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     key_2,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `Key2`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_3` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     key_3,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `Key3`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_4` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 |     key_4,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `Key4`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_Q` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 |     key_Q,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyQ`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_W` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     key_W,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyW`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_E` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     key_E,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyE`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_R` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     key_R,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyR`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_A` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 |     key_A,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyA`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_S` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 |     key_S,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyS`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_D` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:21:5
[INFO] [stderr]    |
[INFO] [stderr] 21 |     key_D,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyD`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_F` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:22:5
[INFO] [stderr]    |
[INFO] [stderr] 22 |     key_F,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyF`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_Z` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     key_Z,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyZ`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_X` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 |     key_X,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyX`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_C` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 |     key_C,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyC`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_V` should have an upper camel case name
[INFO] [stderr]   --> src/keyboard.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 |     key_V,
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `KeyV`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/Cpu.rs:83:10
[INFO] [stderr]    |
[INFO] [stderr] 83 |         let mut file: File = match File::open(&path) {
[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: field is never used: `keys`
[INFO] [stderr]   --> src/Cpu.rs:45:6
[INFO] [stderr]    |
[INFO] [stderr] 45 |         keys: Keyboard,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `draw`
[INFO] [stderr]   --> src/screen.rs:39:5
[INFO] [stderr]    |
[INFO] [stderr] 39 |     pub fn draw(&mut self, x: i32, y: i32){
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `DELAY`
[INFO] [stderr]  --> src/keyboard.rs:8:1
[INFO] [stderr]   |
[INFO] [stderr] 8 | const DELAY: u64 = 2;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Keys`
[INFO] [stderr]   --> src/keyboard.rs:10:1
[INFO] [stderr]    |
[INFO] [stderr] 10 | enum Keys {
[INFO] [stderr]    | ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `event_pump`
[INFO] [stderr]   --> src/keyboard.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     event_pump: sdl2::EventPump,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `last_pressed`
[INFO] [stderr]   --> src/keyboard.rs:33:5
[INFO] [stderr]    |
[INFO] [stderr] 33 |     last_pressed: u8,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `used`
[INFO] [stderr]   --> src/keyboard.rs:34:5
[INFO] [stderr]    |
[INFO] [stderr] 34 |     used: bool,
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `handle_press`
[INFO] [stderr]   --> src/keyboard.rs:52:5
[INFO] [stderr]    |
[INFO] [stderr] 52 |     pub fn handle_press(&mut self) -> u8{
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `wait`
[INFO] [stderr]   --> src/keyboard.rs:99:2
[INFO] [stderr]    |
[INFO] [stderr] 99 |     pub fn wait(&mut self) -> u8 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `key_pressed`
[INFO] [stderr]    --> src/keyboard.rs:118:5
[INFO] [stderr]     |
[INFO] [stderr] 118 |     fn key_pressed(&mut self, key: u8, pressed: bool){
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: module `Cpu` should have a snake case name
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | mod Cpu;
[INFO] [stderr]   |     ^^^ help: convert the identifier to snake case: `cpu`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/Cpu.rs:267:16
[INFO] [stderr]     |
[INFO] [stderr] 267 |                        let x = self.vreg[vx as usize] as u16 + i as u16;
[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: `y`
[INFO] [stderr]    --> src/Cpu.rs:268:19
[INFO] [stderr]     |
[INFO] [stderr] 268 |                        let y = self.vreg[vy as usize] as u16 + i as u16;
[INFO] [stderr]     |                            ^ help: consider prefixing with an underscore: `_y`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/Cpu.rs:278:15
[INFO] [stderr]     |
[INFO] [stderr] 278 |                 let x = (self.opcode & 0x0F00) >> 8;
[INFO] [stderr]     |                     ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/Cpu.rs:83:10
[INFO] [stderr]    |
[INFO] [stderr] 83 |         let mut file: File = match File::open(&path) {
[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: field is never used: `keys`
[INFO] [stderr]   --> src/Cpu.rs:45:6
[INFO] [stderr]    |
[INFO] [stderr] 45 |         keys: Keyboard,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `draw`
[INFO] [stderr]   --> src/screen.rs:39:5
[INFO] [stderr]    |
[INFO] [stderr] 39 |     pub fn draw(&mut self, x: i32, y: i32){
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `DELAY`
[INFO] [stderr]  --> src/keyboard.rs:8:1
[INFO] [stderr]   |
[INFO] [stderr] 8 | const DELAY: u64 = 2;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Keys`
[INFO] [stderr]   --> src/keyboard.rs:10:1
[INFO] [stderr]    |
[INFO] [stderr] 10 | enum Keys {
[INFO] [stderr]    | ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `event_pump`
[INFO] [stderr]   --> src/keyboard.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     event_pump: sdl2::EventPump,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `last_pressed`
[INFO] [stderr]   --> src/keyboard.rs:33:5
[INFO] [stderr]    |
[INFO] [stderr] 33 |     last_pressed: u8,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `used`
[INFO] [stderr]   --> src/keyboard.rs:34:5
[INFO] [stderr]    |
[INFO] [stderr] 34 |     used: bool,
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `handle_press`
[INFO] [stderr]   --> src/keyboard.rs:52:5
[INFO] [stderr]    |
[INFO] [stderr] 52 |     pub fn handle_press(&mut self) -> u8{
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `wait`
[INFO] [stderr]   --> src/keyboard.rs:99:2
[INFO] [stderr]    |
[INFO] [stderr] 99 |     pub fn wait(&mut self) -> u8 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `key_pressed`
[INFO] [stderr]    --> src/keyboard.rs:118:5
[INFO] [stderr]     |
[INFO] [stderr] 118 |     fn key_pressed(&mut self, key: u8, pressed: bool){
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: module `Cpu` should have a snake case name
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | mod Cpu;
[INFO] [stderr]   |     ^^^ help: convert the identifier to snake case: `cpu`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.79s
[INFO] running `"docker" "inspect" "7eed9a6df1b1ac5a267ccd445eab41d45b76b3fceebc5d0a08ed383c7c6479e9"`
[INFO] running `"docker" "rm" "-f" "7eed9a6df1b1ac5a267ccd445eab41d45b76b3fceebc5d0a08ed383c7c6479e9"`
[INFO] [stdout] 7eed9a6df1b1ac5a267ccd445eab41d45b76b3fceebc5d0a08ed383c7c6479e9