[INFO] cloning repository https://github.com/DomParfitt/chip-8
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/DomParfitt/chip-8" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDomParfitt%2Fchip-8", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDomParfitt%2Fchip-8'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3d5eb2d9969b9621efbcd7efbd3956c473e75861
[INFO] checking DomParfitt/chip-8 against master#485ec3fbcc12fa14ef6596dabb125ad710499c9e for pr-157710
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDomParfitt%2Fchip-8" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/DomParfitt/chip-8
[INFO] finished tweaking git repo https://github.com/DomParfitt/chip-8
[INFO] tweaked toml for git repo https://github.com/DomParfitt/chip-8 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/DomParfitt/chip-8 on toolchain 485ec3fbcc12fa14ef6596dabb125ad710499c9e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+485ec3fbcc12fa14ef6596dabb125ad710499c9e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/DomParfitt/chip-8 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+485ec3fbcc12fa14ef6596dabb125ad710499c9e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: Cargo.toml: `package.edition` is unspecified, defaulting to `2015` while the latest is `2024`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3a6becf2bc8dde7f3fa57ede90e4f284e72d296796fc446bbb1e2c7cc0530151" "sleep" "infinity", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "start" "9bd0f3d9e9c68127b22edebdc051446542fe8be4a00a2eb64c49fcab036186a0", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "inspect" "9bd0f3d9e9c68127b22edebdc051446542fe8be4a00a2eb64c49fcab036186a0", kill_on_drop: false }`
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[INFO] [stdout] warning: unused import: `Duration`
[INFO] [stdout]  --> src/main.rs:8:17
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::time::{Duration, Instant};
[INFO] [stdout]   |                 ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Duration`
[INFO] [stdout]  --> src/main.rs:8:17
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::time::{Duration, Instant};
[INFO] [stdout]   |                 ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/assembler/mod.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let mut assembled_program: Vec<u8> = Vec::new();
[INFO] [stdout]   |         ----^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/assembler/mod.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout] 10 |         let mut high: u8;
[INFO] [stdout]    |             ----^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/assembler/mod.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |         let mut low: u8;
[INFO] [stdout]    |             ----^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `high` is assigned to, but never used
[INFO] [stdout]   --> src/assembler/mod.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout] 10 |         let mut high: u8;
[INFO] [stdout]    |             ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_high` instead
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `low` is assigned to, but never used
[INFO] [stdout]   --> src/assembler/mod.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |         let mut low: u8;
[INFO] [stdout]    |             ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_low` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `high` is never read
[INFO] [stdout]   --> src/assembler/mod.rs:17:17
[INFO] [stdout]    |
[INFO] [stdout] 17 |                 high =  (0x8 << 8) | get_register_number(x);
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 24 |                 high = 0x00;
[INFO] [stdout]    |                 ----------- `high` is overwritten here before the previous value is read
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `high` is never read
[INFO] [stdout]   --> src/assembler/mod.rs:24:17
[INFO] [stdout]    |
[INFO] [stdout] 24 |                 high = 0x00;
[INFO] [stdout]    |                 ^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 34 |                 high = 0x00;
[INFO] [stdout]    |                 ----------- `high` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `high` is never read
[INFO] [stdout]   --> src/assembler/mod.rs:34:17
[INFO] [stdout]    |
[INFO] [stdout] 34 |                 high = 0x00;
[INFO] [stdout]    |                 ^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 41 |                 high = (0x3 << 4) | get_register_number(register_token);
[INFO] [stdout]    |                 ------------------------------------------------------- `high` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `high` is never read
[INFO] [stdout]   --> src/assembler/mod.rs:41:17
[INFO] [stdout]    |
[INFO] [stdout] 41 |                 high = (0x3 << 4) | get_register_number(register_token);
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 58 |             _ => {high = 0x00;
[INFO] [stdout]    |                   ----------- `high` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `high` is never read
[INFO] [stdout]   --> src/assembler/mod.rs:58:19
[INFO] [stdout]    |
[INFO] [stdout] 58 |             _ => {high = 0x00;
[INFO] [stdout]    |                   ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `low` is never read
[INFO] [stdout]   --> src/assembler/mod.rs:20:17
[INFO] [stdout]    |
[INFO] [stdout] 20 |                 low = (get_register_number(y) << 8) | 0x2;
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 25 |                 low = 0xE0;
[INFO] [stdout]    |                 ---------- `low` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `low` is never read
[INFO] [stdout]   --> src/assembler/mod.rs:25:17
[INFO] [stdout]    |
[INFO] [stdout] 25 |                 low = 0xE0;
[INFO] [stdout]    |                 ^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 35 |                 low = 0xEE;
[INFO] [stdout]    |                 ---------- `low` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `low` is never read
[INFO] [stdout]   --> src/assembler/mod.rs:35:17
[INFO] [stdout]    |
[INFO] [stdout] 35 |                 low = 0xEE;
[INFO] [stdout]    |                 ^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 46 |                     low = u8::from_str_radix(tokens[i], 16).unwrap();
[INFO] [stdout]    |                     ------------------------------------------------ `low` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `low` is never read
[INFO] [stdout]   --> src/assembler/mod.rs:46:21
[INFO] [stdout]    |
[INFO] [stdout] 44 |                     low = get_register_number(tokens[i]) << 4;
[INFO] [stdout]    |                     ----------------------------------------- `low` is overwritten here before the previous value is read
[INFO] [stdout] 45 |                 } else {
[INFO] [stdout] 46 |                     low = u8::from_str_radix(tokens[i], 16).unwrap();
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `low` is never read
[INFO] [stdout]   --> src/assembler/mod.rs:44:21
[INFO] [stdout]    |
[INFO] [stdout] 44 |                     low = get_register_number(tokens[i]) << 4;
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 59 |                 low = 0xE0;}//panic!("Unrecognised token."),
[INFO] [stdout]    |                 ---------- `low` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `low` is never read
[INFO] [stdout]   --> src/assembler/mod.rs:59:17
[INFO] [stdout]    |
[INFO] [stdout] 59 |                 low = 0xE0;}//panic!("Unrecognised token."),
[INFO] [stdout]    |                 ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `operand`
[INFO] [stdout]   --> src/assembler/mod.rs:70:34
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn assemble_opcode(opcode: &str, operand: &str) -> (u8, u8) {
[INFO] [stdout]    |                                  ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_operand`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `high_byte`
[INFO] [stdout]    --> src/chip8/mod.rs:145:13
[INFO] [stdout]     |
[INFO] [stdout] 145 |         let high_byte = opcode.high_byte;
[INFO] [stdout]     |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_high_byte`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `high_byte`
[INFO] [stdout]    --> src/chip8/mod.rs:442:13
[INFO] [stdout]     |
[INFO] [stdout] 442 |         let high_byte = opcode.high_byte;
[INFO] [stdout]     |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_high_byte`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let mut now = Instant::now();
[INFO] [stdout]    |         ----^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `now`
[INFO] [stdout]   --> src/main.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let mut now = Instant::now();
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_now`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `cycle_count` is assigned to, but never used
[INFO] [stdout]   --> src/main.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let mut cycle_count = 0;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_cycle_count` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `cycle_count` is never read
[INFO] [stdout]   --> src/main.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |         cycle_count += 1;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `assemble` is never used
[INFO] [stdout]  --> src/assembler/mod.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn assemble(program: String) -> Vec<u8> {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `assemble_opcode` is never used
[INFO] [stdout]   --> src/assembler/mod.rs:70:4
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn assemble_opcode(opcode: &str, operand: &str) -> (u8, u8) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_register_number` is never used
[INFO] [stdout]   --> src/assembler/mod.rs:80:4
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn get_register_number(token: &str) -> u8 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `load_program` and `print_display` are never used
[INFO] [stdout]   --> src/chip8/mod.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 31 | impl Chip8 {
[INFO] [stdout]    | ---------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 49 |     pub fn load_program(&mut self, program: Vec<u8>) {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 92 |     pub fn print_display(&self) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `high_nibble_from_byte` and `low_nibble_from_byte` are never used
[INFO] [stdout]    --> src/chip8/mod.rs:402:8
[INFO] [stdout]     |
[INFO] [stdout] 125 | impl Chip8 {
[INFO] [stdout]     | ---------- associated functions in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 402 |     fn high_nibble_from_byte(byte: u8) -> u8 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 406 |     fn low_nibble_from_byte(byte: u8) -> u8 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/assembler/mod.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let mut assembled_program: Vec<u8> = Vec::new();
[INFO] [stdout]   |         ----^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/assembler/mod.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout] 10 |         let mut high: u8;
[INFO] [stdout]    |             ----^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/assembler/mod.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |         let mut low: u8;
[INFO] [stdout]    |             ----^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `high` is assigned to, but never used
[INFO] [stdout]   --> src/assembler/mod.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout] 10 |         let mut high: u8;
[INFO] [stdout]    |             ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_high` instead
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `low` is assigned to, but never used
[INFO] [stdout]   --> src/assembler/mod.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |         let mut low: u8;
[INFO] [stdout]    |             ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_low` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `high` is never read
[INFO] [stdout]   --> src/assembler/mod.rs:17:17
[INFO] [stdout]    |
[INFO] [stdout] 17 |                 high =  (0x8 << 8) | get_register_number(x);
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 24 |                 high = 0x00;
[INFO] [stdout]    |                 ----------- `high` is overwritten here before the previous value is read
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `high` is never read
[INFO] [stdout]   --> src/assembler/mod.rs:24:17
[INFO] [stdout]    |
[INFO] [stdout] 24 |                 high = 0x00;
[INFO] [stdout]    |                 ^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 34 |                 high = 0x00;
[INFO] [stdout]    |                 ----------- `high` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `high` is never read
[INFO] [stdout]   --> src/assembler/mod.rs:34:17
[INFO] [stdout]    |
[INFO] [stdout] 34 |                 high = 0x00;
[INFO] [stdout]    |                 ^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 41 |                 high = (0x3 << 4) | get_register_number(register_token);
[INFO] [stdout]    |                 ------------------------------------------------------- `high` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `high` is never read
[INFO] [stdout]   --> src/assembler/mod.rs:41:17
[INFO] [stdout]    |
[INFO] [stdout] 41 |                 high = (0x3 << 4) | get_register_number(register_token);
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 58 |             _ => {high = 0x00;
[INFO] [stdout]    |                   ----------- `high` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `high` is never read
[INFO] [stdout]   --> src/assembler/mod.rs:58:19
[INFO] [stdout]    |
[INFO] [stdout] 58 |             _ => {high = 0x00;
[INFO] [stdout]    |                   ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `low` is never read
[INFO] [stdout]   --> src/assembler/mod.rs:20:17
[INFO] [stdout]    |
[INFO] [stdout] 20 |                 low = (get_register_number(y) << 8) | 0x2;
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 25 |                 low = 0xE0;
[INFO] [stdout]    |                 ---------- `low` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `low` is never read
[INFO] [stdout]   --> src/assembler/mod.rs:25:17
[INFO] [stdout]    |
[INFO] [stdout] 25 |                 low = 0xE0;
[INFO] [stdout]    |                 ^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 35 |                 low = 0xEE;
[INFO] [stdout]    |                 ---------- `low` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `low` is never read
[INFO] [stdout]   --> src/assembler/mod.rs:35:17
[INFO] [stdout]    |
[INFO] [stdout] 35 |                 low = 0xEE;
[INFO] [stdout]    |                 ^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 46 |                     low = u8::from_str_radix(tokens[i], 16).unwrap();
[INFO] [stdout]    |                     ------------------------------------------------ `low` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `low` is never read
[INFO] [stdout]   --> src/assembler/mod.rs:46:21
[INFO] [stdout]    |
[INFO] [stdout] 44 |                     low = get_register_number(tokens[i]) << 4;
[INFO] [stdout]    |                     ----------------------------------------- `low` is overwritten here before the previous value is read
[INFO] [stdout] 45 |                 } else {
[INFO] [stdout] 46 |                     low = u8::from_str_radix(tokens[i], 16).unwrap();
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `low` is never read
[INFO] [stdout]   --> src/assembler/mod.rs:44:21
[INFO] [stdout]    |
[INFO] [stdout] 44 |                     low = get_register_number(tokens[i]) << 4;
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 59 |                 low = 0xE0;}//panic!("Unrecognised token."),
[INFO] [stdout]    |                 ---------- `low` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `low` is never read
[INFO] [stdout]   --> src/assembler/mod.rs:59:17
[INFO] [stdout]    |
[INFO] [stdout] 59 |                 low = 0xE0;}//panic!("Unrecognised token."),
[INFO] [stdout]    |                 ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `operand`
[INFO] [stdout]   --> src/assembler/mod.rs:70:34
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn assemble_opcode(opcode: &str, operand: &str) -> (u8, u8) {
[INFO] [stdout]    |                                  ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_operand`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:31:13
[INFO] [stdout]    |
[INFO] [stdout] 31 |             io::stdin().read_line(&mut input);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 31 |             let _ = io::stdin().read_line(&mut input);
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: structure field `V` should have a snake case name
[INFO] [stdout]   --> src/chip8/mod.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub V: [u8; 16],
[INFO] [stdout]    |         ^ help: convert the identifier to snake case (notice the capitalization): `v`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: structure field `I` should have a snake case name
[INFO] [stdout]   --> src/chip8/mod.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     pub I: u16,
[INFO] [stdout]    |         ^ help: convert the identifier to snake case (notice the capitalization): `i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `high_byte`
[INFO] [stdout]    --> src/chip8/mod.rs:145:13
[INFO] [stdout]     |
[INFO] [stdout] 145 |         let high_byte = opcode.high_byte;
[INFO] [stdout]     |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_high_byte`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `high_byte`
[INFO] [stdout]    --> src/chip8/mod.rs:442:13
[INFO] [stdout]     |
[INFO] [stdout] 442 |         let high_byte = opcode.high_byte;
[INFO] [stdout]     |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_high_byte`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let mut now = Instant::now();
[INFO] [stdout]    |         ----^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `now`
[INFO] [stdout]   --> src/main.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let mut now = Instant::now();
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_now`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `cycle_count` is assigned to, but never used
[INFO] [stdout]   --> src/main.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let mut cycle_count = 0;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_cycle_count` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `cycle_count` is never read
[INFO] [stdout]   --> src/main.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |         cycle_count += 1;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `assemble` is never used
[INFO] [stdout]  --> src/assembler/mod.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn assemble(program: String) -> Vec<u8> {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `assemble_opcode` is never used
[INFO] [stdout]   --> src/assembler/mod.rs:70:4
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn assemble_opcode(opcode: &str, operand: &str) -> (u8, u8) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_register_number` is never used
[INFO] [stdout]   --> src/assembler/mod.rs:80:4
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn get_register_number(token: &str) -> u8 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test` is never used
[INFO] [stdout]  --> src/assembler/tests.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn test() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `print_display` is never used
[INFO] [stdout]   --> src/chip8/mod.rs:92:12
[INFO] [stdout]    |
[INFO] [stdout] 31 | impl Chip8 {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 92 |     pub fn print_display(&self) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `high_nibble_from_byte` and `low_nibble_from_byte` are never used
[INFO] [stdout]    --> src/chip8/mod.rs:402:8
[INFO] [stdout]     |
[INFO] [stdout] 125 | impl Chip8 {
[INFO] [stdout]     | ---------- associated functions in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 402 |     fn high_nibble_from_byte(byte: u8) -> u8 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 406 |     fn low_nibble_from_byte(byte: u8) -> u8 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:31:13
[INFO] [stdout]    |
[INFO] [stdout] 31 |             io::stdin().read_line(&mut input);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 31 |             let _ = io::stdin().read_line(&mut input);
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: structure field `V` should have a snake case name
[INFO] [stdout]   --> src/chip8/mod.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub V: [u8; 16],
[INFO] [stdout]    |         ^ help: convert the identifier to snake case (notice the capitalization): `v`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: structure field `I` should have a snake case name
[INFO] [stdout]   --> src/chip8/mod.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     pub I: u16,
[INFO] [stdout]    |         ^ help: convert the identifier to snake case (notice the capitalization): `i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 28.46s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: glutin v0.14.0, syn v0.10.8, syn v0.14.1, winit v0.12.0
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 2`
[INFO] running `Command { std: "docker" "inspect" "9bd0f3d9e9c68127b22edebdc051446542fe8be4a00a2eb64c49fcab036186a0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9bd0f3d9e9c68127b22edebdc051446542fe8be4a00a2eb64c49fcab036186a0", kill_on_drop: false }`
[INFO] [stdout] 9bd0f3d9e9c68127b22edebdc051446542fe8be4a00a2eb64c49fcab036186a0
