[INFO] cloning repository https://github.com/varunsareen15/gb_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/varunsareen15/gb_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvarunsareen15%2Fgb_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvarunsareen15%2Fgb_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f15c12a54b6711dada1dbd90c485c75f355e7669
[INFO] checking varunsareen15/gb_rust against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvarunsareen15%2Fgb_rust" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/varunsareen15/gb_rust
[INFO] finished tweaking git repo https://github.com/varunsareen15/gb_rust
[INFO] tweaked toml for git repo https://github.com/varunsareen15/gb_rust written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/varunsareen15/gb_rust on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/varunsareen15/gb_rust 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking varunsareen15/gb_rust against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvarunsareen15%2Fgb_rust" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/varunsareen15/gb_rust
[INFO] finished tweaking git repo https://github.com/varunsareen15/gb_rust
[INFO] tweaked toml for git repo https://github.com/varunsareen15/gb_rust written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/varunsareen15/gb_rust on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/varunsareen15/gb_rust 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 44e90624c0abff4e6822e1364cbec856bdedb5b1248dc52662d5641401631b78
[INFO] running `Command { std: "docker" "start" "-a" "44e90624c0abff4e6822e1364cbec856bdedb5b1248dc52662d5641401631b78", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "44e90624c0abff4e6822e1364cbec856bdedb5b1248dc52662d5641401631b78", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "44e90624c0abff4e6822e1364cbec856bdedb5b1248dc52662d5641401631b78", kill_on_drop: false }`
[INFO] [stdout] 44e90624c0abff4e6822e1364cbec856bdedb5b1248dc52662d5641401631b78
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -Dunmustuse_in_always_ok" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 78d429858db29b1dffc01cd81485d47a27fb5d3cdb3bd781d7d19d126f6eca7f
[INFO] running `Command { std: "docker" "start" "-a" "78d429858db29b1dffc01cd81485d47a27fb5d3cdb3bd781d7d19d126f6eca7f", kill_on_drop: false }`
[INFO] [stderr]     Checking gb_emulator v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `collections::btree_map::Values`, `ptr::addr_of`, and `result`
[INFO] [stdout]  --> src/cpu.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{collections::btree_map::Values, ptr::addr_of, result};
[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 imports: `collections::btree_map::Values`, `ptr::addr_of`, and `result`
[INFO] [stdout]  --> src/cpu.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{collections::btree_map::Values, ptr::addr_of, result};
[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 variable: `address`
[INFO] [stdout]   --> src/cpu.rs:43:26
[INFO] [stdout]    |
[INFO] [stdout] 43 |     fn write_byte(&self, address: u16, byte: u8) {}
[INFO] [stdout]    |                          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_address`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `byte`
[INFO] [stdout]   --> src/cpu.rs:43:40
[INFO] [stdout]    |
[INFO] [stdout] 43 |     fn write_byte(&self, address: u16, byte: u8) {}
[INFO] [stdout]    |                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_byte`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/cpu.rs:686:21
[INFO] [stdout]     |
[INFO] [stdout] 669 |                     LoadType::Byte(target, source) => {
[INFO] [stdout]     |                     ------------------------------ matches all the relevant values
[INFO] [stdout] ...
[INFO] [stdout] 686 |                     _ => { panic!("TODO: implement other load types") }
[INFO] [stdout]     |                     ^ no value can reach this
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Registers` is never constructed
[INFO] [stdout]  --> src/cpu.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct Registers {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `CPU` is never constructed
[INFO] [stdout]   --> src/cpu.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | struct CPU {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MemoryBus` is never constructed
[INFO] [stdout]   --> src/cpu.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 34 | struct MemoryBus {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `read_byte` and `write_byte` are never used
[INFO] [stdout]   --> src/cpu.rs:39:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | impl MemoryBus {
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] 39 |     fn read_byte(&self, address: u16) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 43 |     fn write_byte(&self, address: u16, byte: u8) {}
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `get_bc`, `set_bc`, `get_de`, `set_de`, `get_hl`, and `set_hl` are never used
[INFO] [stdout]   --> src/cpu.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 46 | impl Registers {
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] 47 |     fn get_bc(&self) -> u16 {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 51 |     fn set_bc(&mut self, value: u16) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 56 |     fn get_de(&self) -> u16 {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 60 |     fn set_de(&mut self, value: u16) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 65 |     fn get_hl(&self) -> u16 {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 69 |     fn set_hl(&mut self, value: u16) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Instruction` is never used
[INFO] [stdout]    --> src/cpu.rs:101:6
[INFO] [stdout]     |
[INFO] [stdout] 101 | enum Instruction {
[INFO] [stdout]     |      ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ArithmeticTarget` is never used
[INFO] [stdout]    --> src/cpu.rs:121:6
[INFO] [stdout]     |
[INFO] [stdout] 121 | enum ArithmeticTarget {
[INFO] [stdout]     |      ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ArithmeticHLTarget` is never used
[INFO] [stdout]    --> src/cpu.rs:125:6
[INFO] [stdout]     |
[INFO] [stdout] 125 | enum ArithmeticHLTarget {
[INFO] [stdout]     |      ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `SubtractionTarget` is never used
[INFO] [stdout]    --> src/cpu.rs:129:6
[INFO] [stdout]     |
[INFO] [stdout] 129 | enum SubtractionTarget {
[INFO] [stdout]     |      ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `LogicalTarget` is never used
[INFO] [stdout]    --> src/cpu.rs:133:6
[INFO] [stdout]     |
[INFO] [stdout] 133 | enum LogicalTarget {
[INFO] [stdout]     |      ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `JumpTest` is never used
[INFO] [stdout]    --> src/cpu.rs:137:6
[INFO] [stdout]     |
[INFO] [stdout] 137 | enum JumpTest {
[INFO] [stdout]     |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `LoadByteTarget` is never used
[INFO] [stdout]    --> src/cpu.rs:145:6
[INFO] [stdout]     |
[INFO] [stdout] 145 | enum LoadByteTarget {
[INFO] [stdout]     |      ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `LoadByteSource` is never used
[INFO] [stdout]    --> src/cpu.rs:149:6
[INFO] [stdout]     |
[INFO] [stdout] 149 | enum LoadByteSource {
[INFO] [stdout]     |      ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `LoadType` is never used
[INFO] [stdout]    --> src/cpu.rs:153:6
[INFO] [stdout]     |
[INFO] [stdout] 153 | enum LoadType {
[INFO] [stdout]     |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `StackTarget` is never used
[INFO] [stdout]    --> src/cpu.rs:157:6
[INFO] [stdout]     |
[INFO] [stdout] 157 | enum StackTarget {
[INFO] [stdout]     |      ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IncDecTarget` is never used
[INFO] [stdout]    --> src/cpu.rs:162:6
[INFO] [stdout]     |
[INFO] [stdout] 162 | enum IncDecTarget {
[INFO] [stdout]     |      ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `PrefixTarget` is never used
[INFO] [stdout]    --> src/cpu.rs:166:6
[INFO] [stdout]     |
[INFO] [stdout] 166 | enum PrefixTarget {
[INFO] [stdout]     |      ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple methods are never used
[INFO] [stdout]    --> src/cpu.rs:171:8
[INFO] [stdout]     |
[INFO] [stdout] 170 | impl CPU {
[INFO] [stdout]     | -------- methods in this implementation
[INFO] [stdout] 171 |     fn step(&mut self) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 186 |     fn execute(&mut self, instruction: Instruction) -> u16 {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 723 |     fn call(&mut self, should_jump: bool) -> u16 {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 733 |     fn return_(&mut self, should_jump: bool) -> u16 {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 741 |     fn pop(&mut self) -> u16 {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 751 |     fn push(&mut self, value: u16) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 759 |     fn jump(&self, should_jump: bool) -> u16 {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 774 |     fn add(&mut self, value: u8) -> u8 {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 786 |     fn adc(&mut self, value: u8) -> u8 {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 800 |     fn add_hl(&mut self, value: u16) -> u16 {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 810 |     fn sub(&mut self, value: u8) -> u8 {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 819 |     fn sbc(&mut self, value: u8) -> u8 {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 832 |     fn and(&mut self, value: u8) -> u8 {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 841 |     fn or(&mut self, value: u8) -> u8 {
[INFO] [stdout]     |        ^^
[INFO] [stdout] ...
[INFO] [stdout] 850 |     fn xor(&mut self, value: u8) -> u8 {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 859 |     fn cp(&mut self, value: u8) {
[INFO] [stdout]     |        ^^
[INFO] [stdout] ...
[INFO] [stdout] 867 |     fn read_next_word(&self) -> u16 { 0 }
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 868 |     fn read_next_byte(&self) -> u8 { 0 }
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `from_byte`, `from_byte_prefixed`, and `from_byte_not_prefixed` are never used
[INFO] [stdout]    --> src/cpu.rs:872:8
[INFO] [stdout]     |
[INFO] [stdout] 871 | impl Instruction {
[INFO] [stdout]     | ---------------- associated functions in this implementation
[INFO] [stdout] 872 |     fn from_byte(byte: u8, prefixed: bool) -> Option<Instruction> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 880 |     fn from_byte_prefixed(byte: u8) -> Option<Instruction> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 887 |     fn from_byte_not_prefixed(byte: u8) -> Option<Instruction> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `address`
[INFO] [stdout]   --> src/cpu.rs:43:26
[INFO] [stdout]    |
[INFO] [stdout] 43 |     fn write_byte(&self, address: u16, byte: u8) {}
[INFO] [stdout]    |                          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_address`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `byte`
[INFO] [stdout]   --> src/cpu.rs:43:40
[INFO] [stdout]    |
[INFO] [stdout] 43 |     fn write_byte(&self, address: u16, byte: u8) {}
[INFO] [stdout]    |                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_byte`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/cpu.rs:686:21
[INFO] [stdout]     |
[INFO] [stdout] 669 |                     LoadType::Byte(target, source) => {
[INFO] [stdout]     |                     ------------------------------ matches all the relevant values
[INFO] [stdout] ...
[INFO] [stdout] 686 |                     _ => { panic!("TODO: implement other load types") }
[INFO] [stdout]     |                     ^ no value can reach this
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `b`, `c`, `d`, and `e` are never read
[INFO] [stdout]   --> src/cpu.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout]  9 | struct Registers {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 10 |     a: u8,
[INFO] [stdout] 11 |     b: u8,
[INFO] [stdout]    |     ^
[INFO] [stdout] 12 |     c: u8,
[INFO] [stdout]    |     ^
[INFO] [stdout] 13 |     d: u8,
[INFO] [stdout]    |     ^
[INFO] [stdout] 14 |     e: 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: fields `pc`, `sp`, and `bus` are never read
[INFO] [stdout]   --> src/cpu.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | struct CPU {
[INFO] [stdout]    |        --- fields in this struct
[INFO] [stdout] 28 |     registers: Registers,
[INFO] [stdout] 29 |     pc: u16,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 30 |     sp: u16,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 31 |     bus: MemoryBus,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `memory` is never read
[INFO] [stdout]   --> src/cpu.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | struct MemoryBus {
[INFO] [stdout]    |        --------- field in this struct
[INFO] [stdout] 35 |     memory: [u8; 0xFFFF]
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `read_byte` and `write_byte` are never used
[INFO] [stdout]   --> src/cpu.rs:39:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | impl MemoryBus {
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] 39 |     fn read_byte(&self, address: u16) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 43 |     fn write_byte(&self, address: u16, byte: u8) {}
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `get_bc`, `set_bc`, `get_de`, and `set_de` are never used
[INFO] [stdout]   --> src/cpu.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 46 | impl Registers {
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] 47 |     fn get_bc(&self) -> u16 {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 51 |     fn set_bc(&mut self, value: u16) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 56 |     fn get_de(&self) -> u16 {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 60 |     fn set_de(&mut self, value: u16) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Instruction` is never used
[INFO] [stdout]    --> src/cpu.rs:101:6
[INFO] [stdout]     |
[INFO] [stdout] 101 | enum Instruction {
[INFO] [stdout]     |      ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ArithmeticTarget` is never used
[INFO] [stdout]    --> src/cpu.rs:121:6
[INFO] [stdout]     |
[INFO] [stdout] 121 | enum ArithmeticTarget {
[INFO] [stdout]     |      ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ArithmeticHLTarget` is never used
[INFO] [stdout]    --> src/cpu.rs:125:6
[INFO] [stdout]     |
[INFO] [stdout] 125 | enum ArithmeticHLTarget {
[INFO] [stdout]     |      ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `SubtractionTarget` is never used
[INFO] [stdout]    --> src/cpu.rs:129:6
[INFO] [stdout]     |
[INFO] [stdout] 129 | enum SubtractionTarget {
[INFO] [stdout]     |      ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `LogicalTarget` is never used
[INFO] [stdout]    --> src/cpu.rs:133:6
[INFO] [stdout]     |
[INFO] [stdout] 133 | enum LogicalTarget {
[INFO] [stdout]     |      ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `JumpTest` is never used
[INFO] [stdout]    --> src/cpu.rs:137:6
[INFO] [stdout]     |
[INFO] [stdout] 137 | enum JumpTest {
[INFO] [stdout]     |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `LoadByteTarget` is never used
[INFO] [stdout]    --> src/cpu.rs:145:6
[INFO] [stdout]     |
[INFO] [stdout] 145 | enum LoadByteTarget {
[INFO] [stdout]     |      ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `LoadByteSource` is never used
[INFO] [stdout]    --> src/cpu.rs:149:6
[INFO] [stdout]     |
[INFO] [stdout] 149 | enum LoadByteSource {
[INFO] [stdout]     |      ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `LoadType` is never used
[INFO] [stdout]    --> src/cpu.rs:153:6
[INFO] [stdout]     |
[INFO] [stdout] 153 | enum LoadType {
[INFO] [stdout]     |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `StackTarget` is never used
[INFO] [stdout]    --> src/cpu.rs:157:6
[INFO] [stdout]     |
[INFO] [stdout] 157 | enum StackTarget {
[INFO] [stdout]     |      ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IncDecTarget` is never used
[INFO] [stdout]    --> src/cpu.rs:162:6
[INFO] [stdout]     |
[INFO] [stdout] 162 | enum IncDecTarget {
[INFO] [stdout]     |      ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `PrefixTarget` is never used
[INFO] [stdout]    --> src/cpu.rs:166:6
[INFO] [stdout]     |
[INFO] [stdout] 166 | enum PrefixTarget {
[INFO] [stdout]     |      ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple methods are never used
[INFO] [stdout]    --> src/cpu.rs:171:8
[INFO] [stdout]     |
[INFO] [stdout] 170 | impl CPU {
[INFO] [stdout]     | -------- methods in this implementation
[INFO] [stdout] 171 |     fn step(&mut self) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 186 |     fn execute(&mut self, instruction: Instruction) -> u16 {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 723 |     fn call(&mut self, should_jump: bool) -> u16 {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 733 |     fn return_(&mut self, should_jump: bool) -> u16 {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 741 |     fn pop(&mut self) -> u16 {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 751 |     fn push(&mut self, value: u16) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 759 |     fn jump(&self, should_jump: bool) -> u16 {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 859 |     fn cp(&mut self, value: u8) {
[INFO] [stdout]     |        ^^
[INFO] [stdout] ...
[INFO] [stdout] 867 |     fn read_next_word(&self) -> u16 { 0 }
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 868 |     fn read_next_byte(&self) -> u8 { 0 }
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `from_byte`, `from_byte_prefixed`, and `from_byte_not_prefixed` are never used
[INFO] [stdout]    --> src/cpu.rs:872:8
[INFO] [stdout]     |
[INFO] [stdout] 871 | impl Instruction {
[INFO] [stdout]     | ---------------- associated functions in this implementation
[INFO] [stdout] 872 |     fn from_byte(byte: u8, prefixed: bool) -> Option<Instruction> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 880 |     fn from_byte_prefixed(byte: u8) -> Option<Instruction> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 887 |     fn from_byte_not_prefixed(byte: u8) -> Option<Instruction> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.13s
[INFO] running `Command { std: "docker" "inspect" "78d429858db29b1dffc01cd81485d47a27fb5d3cdb3bd781d7d19d126f6eca7f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "78d429858db29b1dffc01cd81485d47a27fb5d3cdb3bd781d7d19d126f6eca7f", kill_on_drop: false }`
[INFO] [stdout] 78d429858db29b1dffc01cd81485d47a27fb5d3cdb3bd781d7d19d126f6eca7f
