[INFO] cloning repository https://github.com/Gutts-n/chip-8-emulator
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Gutts-n/chip-8-emulator" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGutts-n%2Fchip-8-emulator", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGutts-n%2Fchip-8-emulator'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 421f8bf3f234b82f35d4d7df283954019a6c30e6
[INFO] checking Gutts-n/chip-8-emulator against master#8f21a5c92ea55c348c275a1bc4fedbdf181e0d64 for pr-143011
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGutts-n%2Fchip-8-emulator" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Gutts-n/chip-8-emulator
[INFO] finished tweaking git repo https://github.com/Gutts-n/chip-8-emulator
[INFO] tweaked toml for git repo https://github.com/Gutts-n/chip-8-emulator written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Gutts-n/chip-8-emulator on toolchain 8f21a5c92ea55c348c275a1bc4fedbdf181e0d64
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8f21a5c92ea55c348c275a1bc4fedbdf181e0d64" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Gutts-n/chip-8-emulator 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" "+8f21a5c92ea55c348c275a1bc4fedbdf181e0d64" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8f21a5c92ea55c348c275a1bc4fedbdf181e0d64" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1b7910dae208433ffa1756c495ad86c9cb89866d700217a0c62aa1839cf5813c
[INFO] running `Command { std: "docker" "start" "-a" "1b7910dae208433ffa1756c495ad86c9cb89866d700217a0c62aa1839cf5813c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1b7910dae208433ffa1756c495ad86c9cb89866d700217a0c62aa1839cf5813c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1b7910dae208433ffa1756c495ad86c9cb89866d700217a0c62aa1839cf5813c", kill_on_drop: false }`
[INFO] [stdout] 1b7910dae208433ffa1756c495ad86c9cb89866d700217a0c62aa1839cf5813c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8f21a5c92ea55c348c275a1bc4fedbdf181e0d64" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b8107a167d978ee50d53ec018c44309ce129f7625b5a210b28a956a1ad73dac2
[INFO] running `Command { std: "docker" "start" "-a" "b8107a167d978ee50d53ec018c44309ce129f7625b5a210b28a956a1ad73dac2", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.174
[INFO] [stderr]    Compiling autocfg v1.5.0
[INFO] [stderr]    Compiling zerocopy v0.8.26
[INFO] [stderr]    Compiling getrandom v0.3.3
[INFO] [stderr]    Compiling unicode-segmentation v1.12.0
[INFO] [stderr]    Compiling signal-hook v0.3.18
[INFO] [stderr]    Compiling rustix v1.0.7
[INFO] [stderr]    Compiling syn v2.0.104
[INFO] [stderr]     Checking smallvec v1.15.1
[INFO] [stderr]     Checking log v0.4.27
[INFO] [stderr]    Compiling litrs v0.4.1
[INFO] [stderr]    Compiling convert_case v0.7.1
[INFO] [stderr]    Compiling lock_api v0.4.13
[INFO] [stderr]    Compiling document-features v0.2.11
[INFO] [stderr]     Checking signal-hook-registry v1.4.5
[INFO] [stderr]     Checking mio v1.0.4
[INFO] [stderr]     Checking parking_lot_core v0.9.11
[INFO] [stderr]     Checking rand_core v0.9.3
[INFO] [stderr]     Checking parking_lot v0.12.4
[INFO] [stderr]     Checking signal-hook-mio v0.2.4
[INFO] [stderr]    Compiling derive_more-impl v2.0.1
[INFO] [stderr]     Checking ppv-lite86 v0.2.21
[INFO] [stderr]     Checking rand_chacha v0.9.0
[INFO] [stderr]     Checking derive_more v2.0.1
[INFO] [stderr]     Checking crossterm v0.29.0
[INFO] [stderr]     Checking rand v0.9.1
[INFO] [stderr]     Checking chip-8-emulator v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `Read` and `self`
[INFO] [stdout]  --> src/keyboard.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::io::{self, Read};
[INFO] [stdout]   |               ^^^^  ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0053]: method `get_key_pressed` has an incompatible type for trait
[INFO] [stdout]    --> src/keyboard.rs:155:34
[INFO] [stdout]     |
[INFO] [stdout] 155 |     fn get_key_pressed(&self) -> Option<CosmacVIPKey> {
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^^^^^^^^ expected `u8`, found `Option<CosmacVIPKey>`
[INFO] [stdout]     |
[INFO] [stdout] note: type in trait
[INFO] [stdout]    --> src/keyboard.rs:84:34
[INFO] [stdout]     |
[INFO] [stdout] 84  |     fn get_key_pressed(&self) -> u8;
[INFO] [stdout]     |                                  ^^
[INFO] [stdout]     = note: expected signature `fn(&Keyboard) -> u8`
[INFO] [stdout]                found signature `fn(&Keyboard) -> Option<CosmacVIPKey>`
[INFO] [stdout] help: change the output type to match the trait
[INFO] [stdout]     |
[INFO] [stdout] 155 -     fn get_key_pressed(&self) -> Option<CosmacVIPKey> {
[INFO] [stdout] 155 +     fn get_key_pressed(&self) -> u8 {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Read` and `self`
[INFO] [stdout]  --> src/keyboard.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::io::{self, Read};
[INFO] [stdout]   |               ^^^^  ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0053]: method `get_key_pressed` has an incompatible type for trait
[INFO] [stdout]    --> src/keyboard.rs:155:34
[INFO] [stdout]     |
[INFO] [stdout] 155 |     fn get_key_pressed(&self) -> Option<CosmacVIPKey> {
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^^^^^^^^ expected `u8`, found `Option<CosmacVIPKey>`
[INFO] [stdout]     |
[INFO] [stdout] note: type in trait
[INFO] [stdout]    --> src/keyboard.rs:84:34
[INFO] [stdout]     |
[INFO] [stdout] 84  |     fn get_key_pressed(&self) -> u8;
[INFO] [stdout]     |                                  ^^
[INFO] [stdout]     = note: expected signature `fn(&Keyboard) -> u8`
[INFO] [stdout]                found signature `fn(&Keyboard) -> Option<CosmacVIPKey>`
[INFO] [stdout] help: change the output type to match the trait
[INFO] [stdout]     |
[INFO] [stdout] 155 -     fn get_key_pressed(&self) -> Option<CosmacVIPKey> {
[INFO] [stdout] 155 +     fn get_key_pressed(&self) -> u8 {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/keyboard.rs:158:37
[INFO] [stdout]     |
[INFO] [stdout] 158 |                 true => return Some(key),
[INFO] [stdout]     |                                ---- ^^^ expected `CosmacVIPKey`, found `&CosmacVIPKey`
[INFO] [stdout]     |                                |
[INFO] [stdout]     |                                arguments to this enum variant are incorrect
[INFO] [stdout]     |
[INFO] [stdout] help: the type constructed contains `&CosmacVIPKey` due to the type of the argument passed
[INFO] [stdout]    --> src/keyboard.rs:158:32
[INFO] [stdout]     |
[INFO] [stdout] 158 |                 true => return Some(key),
[INFO] [stdout]     |                                ^^^^^---^
[INFO] [stdout]     |                                     |
[INFO] [stdout]     |                                     this argument influences the type of `Some`
[INFO] [stdout] note: tuple variant defined here
[INFO] [stdout]    --> /rustc/8f21a5c92ea55c348c275a1bc4fedbdf181e0d64/library/core/src/option.rs:599:5
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/keyboard.rs:156:9
[INFO] [stdout]     |
[INFO] [stdout] 155 |       fn get_key_pressed(&self) -> Option<CosmacVIPKey> {
[INFO] [stdout]     |                                    -------------------- expected `Option<CosmacVIPKey>` because of return type
[INFO] [stdout] 156 | /         for (key, value) in self.keys.iter_mut() {
[INFO] [stdout] 157 | |             match value {
[INFO] [stdout] 158 | |                 true => return Some(key),
[INFO] [stdout] 159 | |                 false => return None,
[INFO] [stdout] 160 | |             }
[INFO] [stdout] 161 | |         }
[INFO] [stdout]     | |_________^ expected `Option<CosmacVIPKey>`, found `()`
[INFO] [stdout]     |
[INFO] [stdout]     = note:   expected enum `Option<CosmacVIPKey>`
[INFO] [stdout]             found unit type `()`
[INFO] [stdout]     = note: `for` loops evaluate to unit type `()`
[INFO] [stdout] help: try adding an expression at the end of the block
[INFO] [stdout]     |
[INFO] [stdout] 161 ~         }
[INFO] [stdout] 162 +         None
[INFO] [stdout]     |
[INFO] [stdout] 161 ~         }
[INFO] [stdout] 162 +         Some(())
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/keyboard.rs:158:37
[INFO] [stdout]     |
[INFO] [stdout] 158 |                 true => return Some(key),
[INFO] [stdout]     |                                ---- ^^^ expected `CosmacVIPKey`, found `&CosmacVIPKey`
[INFO] [stdout]     |                                |
[INFO] [stdout]     |                                arguments to this enum variant are incorrect
[INFO] [stdout]     |
[INFO] [stdout] help: the type constructed contains `&CosmacVIPKey` due to the type of the argument passed
[INFO] [stdout]    --> src/keyboard.rs:158:32
[INFO] [stdout]     |
[INFO] [stdout] 158 |                 true => return Some(key),
[INFO] [stdout]     |                                ^^^^^---^
[INFO] [stdout]     |                                     |
[INFO] [stdout]     |                                     this argument influences the type of `Some`
[INFO] [stdout] note: tuple variant defined here
[INFO] [stdout]    --> /rustc/8f21a5c92ea55c348c275a1bc4fedbdf181e0d64/library/core/src/option.rs:599:5
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/keyboard.rs:156:9
[INFO] [stdout]     |
[INFO] [stdout] 155 |       fn get_key_pressed(&self) -> Option<CosmacVIPKey> {
[INFO] [stdout]     |                                    -------------------- expected `Option<CosmacVIPKey>` because of return type
[INFO] [stdout] 156 | /         for (key, value) in self.keys.iter_mut() {
[INFO] [stdout] 157 | |             match value {
[INFO] [stdout] 158 | |                 true => return Some(key),
[INFO] [stdout] 159 | |                 false => return None,
[INFO] [stdout] 160 | |             }
[INFO] [stdout] 161 | |         }
[INFO] [stdout]     | |_________^ expected `Option<CosmacVIPKey>`, found `()`
[INFO] [stdout]     |
[INFO] [stdout]     = note:   expected enum `Option<CosmacVIPKey>`
[INFO] [stdout]             found unit type `()`
[INFO] [stdout]     = note: `for` loops evaluate to unit type `()`
[INFO] [stdout] help: try adding an expression at the end of the block
[INFO] [stdout]     |
[INFO] [stdout] 161 ~         }
[INFO] [stdout] 162 +         None
[INFO] [stdout]     |
[INFO] [stdout] 161 ~         }
[INFO] [stdout] 162 +         Some(())
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Write`
[INFO] [stdout]   --> src/main.rs:14:21
[INFO] [stdout]    |
[INFO] [stdout] 14 | use std::io::{self, Write};
[INFO] [stdout]    |                     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `kind`
[INFO] [stdout]   --> src/keyboard.rs:93:17
[INFO] [stdout]    |
[INFO] [stdout] 93 |                 kind,
[INFO] [stdout]    |                 ^^^^ help: try ignoring the field: `kind: _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `state`
[INFO] [stdout]   --> src/keyboard.rs:94:17
[INFO] [stdout]    |
[INFO] [stdout] 94 |                 state,
[INFO] [stdout]    |                 ^^^^^ help: try ignoring the field: `state: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Write`
[INFO] [stdout]   --> src/main.rs:14:21
[INFO] [stdout]    |
[INFO] [stdout] 14 | use std::io::{self, Write};
[INFO] [stdout]    |                     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `f_register` is assigned to, but never used
[INFO] [stdout]   --> src/main.rs:85:13
[INFO] [stdout]    |
[INFO] [stdout] 85 |     let mut f_register: u8 = 0x00;
[INFO] [stdout]    |             ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_f_register` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `f_register` is never read
[INFO] [stdout]    --> src/main.rs:204:21
[INFO] [stdout]     |
[INFO] [stdout] 204 |                     f_register = 1;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `f_register` is never read
[INFO] [stdout]    --> src/main.rs:206:21
[INFO] [stdout]     |
[INFO] [stdout] 206 |                     f_register = 0;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `f_register` is never read
[INFO] [stdout]    --> src/main.rs:216:21
[INFO] [stdout]     |
[INFO] [stdout] 216 |                     f_register = 1;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `f_register` is never read
[INFO] [stdout]    --> src/main.rs:218:21
[INFO] [stdout]     |
[INFO] [stdout] 218 |                     f_register = 0;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `f_register` is never read
[INFO] [stdout]    --> src/main.rs:229:21
[INFO] [stdout]     |
[INFO] [stdout] 229 |                     f_register = 1;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `f_register` is never read
[INFO] [stdout]    --> src/main.rs:231:21
[INFO] [stdout]     |
[INFO] [stdout] 231 |                     f_register = 0;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `f_register` is never read
[INFO] [stdout]    --> src/main.rs:241:21
[INFO] [stdout]     |
[INFO] [stdout] 241 |                     f_register = 1;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `f_register` is never read
[INFO] [stdout]    --> src/main.rs:243:21
[INFO] [stdout]     |
[INFO] [stdout] 243 |                     f_register = 0;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `f_register` is never read
[INFO] [stdout]    --> src/main.rs:255:21
[INFO] [stdout]     |
[INFO] [stdout] 255 |                     f_register = 1;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `f_register` is never read
[INFO] [stdout]    --> src/main.rs:257:21
[INFO] [stdout]     |
[INFO] [stdout] 257 |                     f_register = 0;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `default`
[INFO] [stdout]    --> src/main.rs:362:13
[INFO] [stdout]     |
[INFO] [stdout] 362 |             default => {} // default => panic!("TODO not implemented yet {}", default),
[INFO] [stdout]     |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_default`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `kind`
[INFO] [stdout]   --> src/keyboard.rs:93:17
[INFO] [stdout]    |
[INFO] [stdout] 93 |                 kind,
[INFO] [stdout]    |                 ^^^^ help: try ignoring the field: `kind: _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `state`
[INFO] [stdout]   --> src/keyboard.rs:94:17
[INFO] [stdout]    |
[INFO] [stdout] 94 |                 state,
[INFO] [stdout]    |                 ^^^^^ help: try ignoring the field: `state: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |     let mut program_counter_sum_value = 2;
[INFO] [stdout]    |         ----^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `f_register` is assigned to, but never used
[INFO] [stdout]   --> src/main.rs:85:13
[INFO] [stdout]    |
[INFO] [stdout] 85 |     let mut f_register: u8 = 0x00;
[INFO] [stdout]    |             ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_f_register` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `f_register` is never read
[INFO] [stdout]    --> src/main.rs:204:21
[INFO] [stdout]     |
[INFO] [stdout] 204 |                     f_register = 1;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `f_register` is never read
[INFO] [stdout]    --> src/main.rs:206:21
[INFO] [stdout]     |
[INFO] [stdout] 206 |                     f_register = 0;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `f_register` is never read
[INFO] [stdout]    --> src/main.rs:216:21
[INFO] [stdout]     |
[INFO] [stdout] 216 |                     f_register = 1;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `f_register` is never read
[INFO] [stdout]    --> src/main.rs:218:21
[INFO] [stdout]     |
[INFO] [stdout] 218 |                     f_register = 0;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `f_register` is never read
[INFO] [stdout]    --> src/main.rs:229:21
[INFO] [stdout]     |
[INFO] [stdout] 229 |                     f_register = 1;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0053, E0308.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0053`.
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `f_register` is never read
[INFO] [stdout]    --> src/main.rs:231:21
[INFO] [stdout]     |
[INFO] [stdout] 231 |                     f_register = 0;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `f_register` is never read
[INFO] [stdout]    --> src/main.rs:241:21
[INFO] [stdout]     |
[INFO] [stdout] 241 |                     f_register = 1;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `f_register` is never read
[INFO] [stdout]    --> src/main.rs:243:21
[INFO] [stdout]     |
[INFO] [stdout] 243 |                     f_register = 0;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `f_register` is never read
[INFO] [stdout]    --> src/main.rs:255:21
[INFO] [stdout]     |
[INFO] [stdout] 255 |                     f_register = 1;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `f_register` is never read
[INFO] [stdout]    --> src/main.rs:257:21
[INFO] [stdout]     |
[INFO] [stdout] 257 |                     f_register = 0;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `default`
[INFO] [stdout]    --> src/main.rs:362:13
[INFO] [stdout]     |
[INFO] [stdout] 362 |             default => {} // default => panic!("TODO not implemented yet {}", default),
[INFO] [stdout]     |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_default`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |     let mut program_counter_sum_value = 2;
[INFO] [stdout]    |         ----^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `chip-8-emulator` (bin "chip-8-emulator" test) due to 3 previous errors; 17 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] Some errors have detailed explanations: E0053, E0308.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0053`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `chip-8-emulator` (bin "chip-8-emulator") due to 3 previous errors; 17 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "b8107a167d978ee50d53ec018c44309ce129f7625b5a210b28a956a1ad73dac2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b8107a167d978ee50d53ec018c44309ce129f7625b5a210b28a956a1ad73dac2", kill_on_drop: false }`
[INFO] [stdout] b8107a167d978ee50d53ec018c44309ce129f7625b5a210b28a956a1ad73dac2
