[INFO] updating cached repository https://github.com/ZacJoffe/chip8-emulator
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 876a604de42a2bf71999fb36bc8ce3ba0e5fc8bc
[INFO] checking ZacJoffe/chip8-emulator against try#1a608893c03d7722effeb0058e82770bd36b4b3c for pr-66504-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FZacJoffe%2Fchip8-emulator" "/workspace/builds/worker-2/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ZacJoffe/chip8-emulator on toolchain 1a608893c03d7722effeb0058e82770bd36b4b3c
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/ZacJoffe/chip8-emulator
[INFO] finished tweaking git repo https://github.com/ZacJoffe/chip8-emulator
[INFO] tweaked toml for git repo https://github.com/ZacJoffe/chip8-emulator written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/ZacJoffe/chip8-emulator already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"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" "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" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] f75efd15de8eb2fca30d3a1c005cbaf9342779bf7cab210d16c449686b399c09
[INFO] running `"docker" "start" "-a" "f75efd15de8eb2fca30d3a1c005cbaf9342779bf7cab210d16c449686b399c09"`
[INFO] [stderr]     Checking sdl2-sys v0.32.6
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking sdl2 v0.32.2
[INFO] [stderr]     Checking chip8-emulator v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `sdl2::keyboard::Keycode`
[INFO] [stderr]  --> src/keypad.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use sdl2::keyboard::Keycode;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `sdl2::keyboard::Keycode`
[INFO] [stderr]  --> src/keypad.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use sdl2::keyboard::Keycode;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `i`
[INFO] [stderr]  --> src/cpu.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     i: u16,
[INFO] [stderr]   |     ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `v`
[INFO] [stderr]   --> src/cpu.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     v: [u8; 16],
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `pc`
[INFO] [stderr]   --> src/cpu.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     pc: u16,
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `sp`
[INFO] [stderr]   --> src/cpu.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     sp: u16,
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `stack`
[INFO] [stderr]   --> src/cpu.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     stack: [u16; 16],
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `sound_timer`
[INFO] [stderr]   --> src/cpu.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 |     sound_timer: u8,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `delay_timer`
[INFO] [stderr]   --> src/cpu.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     delay_timer: u8,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `opcode`
[INFO] [stderr]   --> src/cpu.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     opcode: u16,
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `key`
[INFO] [stderr]   --> src/cpu.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     key: Keypad,
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `graphics`
[INFO] [stderr]   --> src/cpu.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 |     graphics: Graphics<'a>
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `emulate_cycle`
[INFO] [stderr]   --> src/cpu.rs:56:5
[INFO] [stderr]    |
[INFO] [stderr] 56 |     fn emulate_cycle(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_0`
[INFO] [stderr]   --> src/cpu.rs:94:5
[INFO] [stderr]    |
[INFO] [stderr] 94 |     fn instr_0(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_1`
[INFO] [stderr]    --> src/cpu.rs:111:5
[INFO] [stderr]     |
[INFO] [stderr] 111 |     fn instr_1(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_2`
[INFO] [stderr]    --> src/cpu.rs:115:5
[INFO] [stderr]     |
[INFO] [stderr] 115 |     fn instr_2(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_3`
[INFO] [stderr]    --> src/cpu.rs:121:5
[INFO] [stderr]     |
[INFO] [stderr] 121 |     fn instr_3(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_4`
[INFO] [stderr]    --> src/cpu.rs:129:5
[INFO] [stderr]     |
[INFO] [stderr] 129 |     fn instr_4(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_5`
[INFO] [stderr]    --> src/cpu.rs:137:5
[INFO] [stderr]     |
[INFO] [stderr] 137 |     fn instr_5(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_6`
[INFO] [stderr]    --> src/cpu.rs:145:5
[INFO] [stderr]     |
[INFO] [stderr] 145 |     fn instr_6(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_7`
[INFO] [stderr]    --> src/cpu.rs:150:5
[INFO] [stderr]     |
[INFO] [stderr] 150 |     fn instr_7(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_8`
[INFO] [stderr]    --> src/cpu.rs:155:5
[INFO] [stderr]     |
[INFO] [stderr] 155 |     fn instr_8(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_9`
[INFO] [stderr]    --> src/cpu.rs:217:5
[INFO] [stderr]     |
[INFO] [stderr] 217 |     fn instr_9(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_a`
[INFO] [stderr]    --> src/cpu.rs:228:5
[INFO] [stderr]     |
[INFO] [stderr] 228 |     fn instr_a(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_b`
[INFO] [stderr]    --> src/cpu.rs:233:5
[INFO] [stderr]     |
[INFO] [stderr] 233 |     fn instr_b(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_c`
[INFO] [stderr]    --> src/cpu.rs:237:5
[INFO] [stderr]     |
[INFO] [stderr] 237 |     fn instr_c(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_d`
[INFO] [stderr]    --> src/cpu.rs:246:5
[INFO] [stderr]     |
[INFO] [stderr] 246 |     fn instr_d(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_e`
[INFO] [stderr]    --> src/cpu.rs:256:5
[INFO] [stderr]     |
[INFO] [stderr] 256 |     fn instr_e(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_f`
[INFO] [stderr]    --> src/cpu.rs:279:5
[INFO] [stderr]     |
[INFO] [stderr] 279 |     fn instr_f(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `nop`
[INFO] [stderr]    --> src/cpu.rs:332:5
[INFO] [stderr]     |
[INFO] [stderr] 332 |     fn nop(&self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `opcode_x`
[INFO] [stderr]    --> src/cpu.rs:337:5
[INFO] [stderr]     |
[INFO] [stderr] 337 |     fn opcode_x(&self) -> usize {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `opcode_y`
[INFO] [stderr]    --> src/cpu.rs:342:5
[INFO] [stderr]     |
[INFO] [stderr] 342 |     fn opcode_y(&self) -> usize {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `opcode_n`
[INFO] [stderr]    --> src/cpu.rs:346:5
[INFO] [stderr]     |
[INFO] [stderr] 346 |     fn opcode_n(&self) -> u8 {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `opcode_nn`
[INFO] [stderr]    --> src/cpu.rs:350:5
[INFO] [stderr]     |
[INFO] [stderr] 350 |     fn opcode_nn(&self) -> u8 {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `opcode_nnn`
[INFO] [stderr]    --> src/cpu.rs:354:5
[INFO] [stderr]     |
[INFO] [stderr] 354 |     fn opcode_nnn(&self) -> u16 {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `key`
[INFO] [stderr]  --> src/keypad.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 |     key: [bool; 16]
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_pressed`
[INFO] [stderr]   --> src/keypad.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 |     pub fn is_pressed(&self, i: usize) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `gfx`
[INFO] [stderr]  --> src/graphics.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     gfx: [[u8; 64]; 32], // represent graphics as a 2d array
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `surface`
[INFO] [stderr]  --> src/graphics.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 |     surface: Surface<'a>,
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `draw_flag`
[INFO] [stderr]  --> src/graphics.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 |     draw_flag: bool
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `clear`
[INFO] [stderr]   --> src/graphics.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     pub fn clear(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `update`
[INFO] [stderr]   --> src/graphics.rs:28:5
[INFO] [stderr]    |
[INFO] [stderr] 28 |     pub fn update(&mut self, x: usize, y: usize, height: u8, i: u16, mem: [u8; 4096]) -> u8 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `i`
[INFO] [stderr]  --> src/cpu.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     i: u16,
[INFO] [stderr]   |     ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `v`
[INFO] [stderr]   --> src/cpu.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     v: [u8; 16],
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `pc`
[INFO] [stderr]   --> src/cpu.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     pc: u16,
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `sp`
[INFO] [stderr]   --> src/cpu.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     sp: u16,
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `stack`
[INFO] [stderr]   --> src/cpu.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     stack: [u16; 16],
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `sound_timer`
[INFO] [stderr]   --> src/cpu.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 |     sound_timer: u8,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `delay_timer`
[INFO] [stderr]   --> src/cpu.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     delay_timer: u8,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `opcode`
[INFO] [stderr]   --> src/cpu.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     opcode: u16,
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `key`
[INFO] [stderr]   --> src/cpu.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     key: Keypad,
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `graphics`
[INFO] [stderr]   --> src/cpu.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 |     graphics: Graphics<'a>
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `emulate_cycle`
[INFO] [stderr]   --> src/cpu.rs:56:5
[INFO] [stderr]    |
[INFO] [stderr] 56 |     fn emulate_cycle(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_0`
[INFO] [stderr]   --> src/cpu.rs:94:5
[INFO] [stderr]    |
[INFO] [stderr] 94 |     fn instr_0(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_1`
[INFO] [stderr]    --> src/cpu.rs:111:5
[INFO] [stderr]     |
[INFO] [stderr] 111 |     fn instr_1(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_2`
[INFO] [stderr]    --> src/cpu.rs:115:5
[INFO] [stderr]     |
[INFO] [stderr] 115 |     fn instr_2(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_3`
[INFO] [stderr]    --> src/cpu.rs:121:5
[INFO] [stderr]     |
[INFO] [stderr] 121 |     fn instr_3(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_4`
[INFO] [stderr]    --> src/cpu.rs:129:5
[INFO] [stderr]     |
[INFO] [stderr] 129 |     fn instr_4(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_5`
[INFO] [stderr]    --> src/cpu.rs:137:5
[INFO] [stderr]     |
[INFO] [stderr] 137 |     fn instr_5(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_6`
[INFO] [stderr]    --> src/cpu.rs:145:5
[INFO] [stderr]     |
[INFO] [stderr] 145 |     fn instr_6(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_7`
[INFO] [stderr]    --> src/cpu.rs:150:5
[INFO] [stderr]     |
[INFO] [stderr] 150 |     fn instr_7(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_8`
[INFO] [stderr]    --> src/cpu.rs:155:5
[INFO] [stderr]     |
[INFO] [stderr] 155 |     fn instr_8(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_9`
[INFO] [stderr]    --> src/cpu.rs:217:5
[INFO] [stderr]     |
[INFO] [stderr] 217 |     fn instr_9(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_a`
[INFO] [stderr]    --> src/cpu.rs:228:5
[INFO] [stderr]     |
[INFO] [stderr] 228 |     fn instr_a(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_b`
[INFO] [stderr]    --> src/cpu.rs:233:5
[INFO] [stderr]     |
[INFO] [stderr] 233 |     fn instr_b(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_c`
[INFO] [stderr]    --> src/cpu.rs:237:5
[INFO] [stderr]     |
[INFO] [stderr] 237 |     fn instr_c(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_d`
[INFO] [stderr]    --> src/cpu.rs:246:5
[INFO] [stderr]     |
[INFO] [stderr] 246 |     fn instr_d(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_e`
[INFO] [stderr]    --> src/cpu.rs:256:5
[INFO] [stderr]     |
[INFO] [stderr] 256 |     fn instr_e(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `instr_f`
[INFO] [stderr]    --> src/cpu.rs:279:5
[INFO] [stderr]     |
[INFO] [stderr] 279 |     fn instr_f(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `nop`
[INFO] [stderr]    --> src/cpu.rs:332:5
[INFO] [stderr]     |
[INFO] [stderr] 332 |     fn nop(&self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `opcode_x`
[INFO] [stderr]    --> src/cpu.rs:337:5
[INFO] [stderr]     |
[INFO] [stderr] 337 |     fn opcode_x(&self) -> usize {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `opcode_y`
[INFO] [stderr]    --> src/cpu.rs:342:5
[INFO] [stderr]     |
[INFO] [stderr] 342 |     fn opcode_y(&self) -> usize {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `opcode_n`
[INFO] [stderr]    --> src/cpu.rs:346:5
[INFO] [stderr]     |
[INFO] [stderr] 346 |     fn opcode_n(&self) -> u8 {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `opcode_nn`
[INFO] [stderr]    --> src/cpu.rs:350:5
[INFO] [stderr]     |
[INFO] [stderr] 350 |     fn opcode_nn(&self) -> u8 {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `opcode_nnn`
[INFO] [stderr]    --> src/cpu.rs:354:5
[INFO] [stderr]     |
[INFO] [stderr] 354 |     fn opcode_nnn(&self) -> u16 {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `key`
[INFO] [stderr]  --> src/keypad.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 |     key: [bool; 16]
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_pressed`
[INFO] [stderr]   --> src/keypad.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 |     pub fn is_pressed(&self, i: usize) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `gfx`
[INFO] [stderr]  --> src/graphics.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     gfx: [[u8; 64]; 32], // represent graphics as a 2d array
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `surface`
[INFO] [stderr]  --> src/graphics.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 |     surface: Surface<'a>,
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `draw_flag`
[INFO] [stderr]  --> src/graphics.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 |     draw_flag: bool
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `clear`
[INFO] [stderr]   --> src/graphics.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     pub fn clear(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `update`
[INFO] [stderr]   --> src/graphics.rs:28:5
[INFO] [stderr]    |
[INFO] [stderr] 28 |     pub fn update(&mut self, x: usize, y: usize, height: u8, i: u16, mem: [u8; 4096]) -> u8 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.12s
[INFO] running `"docker" "inspect" "f75efd15de8eb2fca30d3a1c005cbaf9342779bf7cab210d16c449686b399c09"`
[INFO] running `"docker" "rm" "-f" "f75efd15de8eb2fca30d3a1c005cbaf9342779bf7cab210d16c449686b399c09"`
[INFO] [stdout] f75efd15de8eb2fca30d3a1c005cbaf9342779bf7cab210d16c449686b399c09