[INFO] cloning repository https://github.com/vernonrj/MIPSical
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/vernonrj/MIPSical" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvernonrj%2FMIPSical", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvernonrj%2FMIPSical'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7838ffd302ac7db5ed8eb21f0bb74b82f1ae3e31
[INFO] checking vernonrj/MIPSical against master#1f12b9b0fdbe735968ac002792a720f0ba4faca6 for crater-rollup-uwu
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvernonrj%2FMIPSical" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/vernonrj/MIPSical on toolchain 1f12b9b0fdbe735968ac002792a720f0ba4faca6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/vernonrj/MIPSical
[INFO] finished tweaking git repo https://github.com/vernonrj/MIPSical
[INFO] tweaked toml for git repo https://github.com/vernonrj/MIPSical written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/vernonrj/MIPSical 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" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded log v0.3.5
[INFO] [stderr]   Downloaded regex-syntax v0.2.5
[INFO] [stderr]   Downloaded libc v0.2.7
[INFO] [stderr]   Downloaded regex v0.1.55
[INFO] [stderr]   Downloaded aho-corasick v0.5.1
[INFO] [stderr]   Downloaded memchr v0.1.10
[INFO] [stderr]   Downloaded quickcheck v0.2.25
[INFO] [stderr]   Downloaded env_logger v0.3.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5b3fe0335ac6e330707555e0c3ac1ddb896fa62d8514361eb82c9fe981decb6c
[INFO] running `Command { std: "docker" "start" "-a" "5b3fe0335ac6e330707555e0c3ac1ddb896fa62d8514361eb82c9fe981decb6c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5b3fe0335ac6e330707555e0c3ac1ddb896fa62d8514361eb82c9fe981decb6c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5b3fe0335ac6e330707555e0c3ac1ddb896fa62d8514361eb82c9fe981decb6c", kill_on_drop: false }`
[INFO] [stdout] 5b3fe0335ac6e330707555e0c3ac1ddb896fa62d8514361eb82c9fe981decb6c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 00250a2aad9e32d1f37a3ca42352d0c291328ca9521657bde05cbd218d197d8a
[INFO] running `Command { std: "docker" "start" "-a" "00250a2aad9e32d1f37a3ca42352d0c291328ca9521657bde05cbd218d197d8a", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr]     Checking libc v0.2.7
[INFO] [stderr]     Checking regex-syntax v0.2.5
[INFO] [stderr]     Checking utf8-ranges v0.1.3
[INFO] [stderr]     Checking mips v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/instruction/add.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 |     };
[INFO] [stdout]    |      ^ help: remove this semicolon
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `error::ExecResult`
[INFO] [stdout]  --> src/instruction/branch.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use error::ExecResult;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/decoder.rs:22:22
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub execute: Box<Fn(&Vec<u32>) -> ExecResult<u32>>,
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub execute: Box<dyn Fn(&Vec<u32>) -> ExecResult<u32>>,
[INFO] [stdout]    |                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/decoder.rs:23:27
[INFO] [stdout]    |
[INFO] [stdout] 23 |     pub branch_taken: Box<Fn(&Vec<u32>) -> bool>,
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 23 |     pub branch_taken: Box<dyn Fn(&Vec<u32>) -> bool>,
[INFO] [stdout]    |                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/error.rs:23:16
[INFO] [stdout]    |
[INFO] [stdout] 23 |     error: Box<error::Error + Send + Sync>,
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 23 |     error: Box<dyn error::Error + Send + Sync>,
[INFO] [stdout]    |                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/error.rs:28:27
[INFO] [stdout]    |
[INFO] [stdout] 28 |         where E: Into<Box<error::Error + Send + Sync>>
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 28 |         where E: Into<Box<dyn error::Error + Send + Sync>>
[INFO] [stdout]    |                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Normal`, `Special`, and `RegImm` are never constructed
[INFO] [stdout]  --> src/decoded.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub enum Opcode {
[INFO] [stdout]   |          ------ variants in this enum
[INFO] [stdout] 5 |     Normal(u8),
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 6 |     Special(u8),
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 7 |     RegImm(u8),
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Opcode` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Decodable` is never used
[INFO] [stdout]   --> src/decoded.rs:10:11
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub trait Decodable {
[INFO] [stdout]    |           ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Decoded` is never used
[INFO] [stdout]   --> src/decoded.rs:14:11
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub trait Decoded {
[INFO] [stdout]    |           ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Register` is never constructed
[INFO] [stdout]   --> src/decoded.rs:21:12
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub struct Register(pub u8);
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `RS`, `RT`, `RD`, `SA`, and `Immediate` are never constructed
[INFO] [stdout]   --> src/decoder.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub enum Register {
[INFO] [stdout]    |          -------- variants in this enum
[INFO] [stdout] 11 |     RS,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 12 |     RT,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 13 |     RD,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 14 |     SA,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 15 |     Immediate,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name`, `inputs`, `outputs`, `execute`, and `branch_taken` are never read
[INFO] [stdout]   --> src/decoder.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub struct Instruction {
[INFO] [stdout]    |            ----------- fields in this struct
[INFO] [stdout] 19 |     pub name: &'static str,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 20 |     pub inputs: Vec<Register>,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 21 |     pub outputs: Option<Register>,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 22 |     pub execute: Box<Fn(&Vec<u32>) -> ExecResult<u32>>,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 23 |     pub branch_taken: Box<Fn(&Vec<u32>) -> bool>,
[INFO] [stdout]    |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Decoder` is never constructed
[INFO] [stdout]   --> src/decoder.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 44 | pub struct Decoder {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `decode`, and `keys` are never used
[INFO] [stdout]   --> src/decoder.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 48 | impl Decoder {
[INFO] [stdout]    | ------------ associated items in this implementation
[INFO] [stdout] 49 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 57 |     pub fn decode(&self, command: Fetched) -> Option<&Instruction> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 68 |     pub fn keys(&self) -> Vec<Opcode> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Fetched` is never constructed
[INFO] [stdout]   --> src/decoder.rs:73:12
[INFO] [stdout]    |
[INFO] [stdout] 73 | pub struct Fetched(pub u32);
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `extract_31_26` is never used
[INFO] [stdout]   --> src/decoder.rs:75:8
[INFO] [stdout]    |
[INFO] [stdout] 75 | pub fn extract_31_26(bitfield: u32) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `extract_25_21` is never used
[INFO] [stdout]   --> src/decoder.rs:78:8
[INFO] [stdout]    |
[INFO] [stdout] 78 | pub fn extract_25_21(bitfield: u32) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `extract_20_16` is never used
[INFO] [stdout]   --> src/decoder.rs:81:8
[INFO] [stdout]    |
[INFO] [stdout] 81 | pub fn extract_20_16(bitfield: u32) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `extract_15_11` is never used
[INFO] [stdout]   --> src/decoder.rs:84:8
[INFO] [stdout]    |
[INFO] [stdout] 84 | pub fn extract_15_11(bitfield: u32) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `extract_15_0` is never used
[INFO] [stdout]   --> src/decoder.rs:87:8
[INFO] [stdout]    |
[INFO] [stdout] 87 | pub fn extract_15_0(bitfield: u32) -> u16 {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `extract_10_6` is never used
[INFO] [stdout]   --> src/decoder.rs:90:8
[INFO] [stdout]    |
[INFO] [stdout] 90 | pub fn extract_10_6(bitfield: u32) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `extract_5_0` is never used
[INFO] [stdout]   --> src/decoder.rs:93:8
[INFO] [stdout]    |
[INFO] [stdout] 93 | pub fn extract_5_0(bitfield: u32) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `extract_25_0` is never used
[INFO] [stdout]   --> src/decoder.rs:96:8
[INFO] [stdout]    |
[INFO] [stdout] 96 | pub fn extract_25_0(bitfield: u32) -> u32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `register` is never used
[INFO] [stdout]  --> src/instruction/add.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn register(m: &mut HashMap<Opcode, Instruction>) {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `register` is never used
[INFO] [stdout]  --> src/instruction/and.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn register(m: &mut HashMap<Opcode, Instruction>) {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `register` is never used
[INFO] [stdout]  --> src/instruction/branch.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn register(m: &mut HashMap<Opcode, Instruction>) {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `register` is never used
[INFO] [stdout]  --> src/instruction/shift.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn register(m: &mut HashMap<Opcode, Instruction>) {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Success` and `Exception` are never constructed
[INFO] [stdout]  --> src/error.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub enum ExecResult<T> {
[INFO] [stdout]   |          ---------- variants in this enum
[INFO] [stdout] 5 |     Success(T),
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 6 |     Empty,
[INFO] [stdout] 7 |     Exception(ExecError),
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `unwrap` is never used
[INFO] [stdout]   --> src/error.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl<T> ExecResult<T> {
[INFO] [stdout]    | --------------------- method in this implementation
[INFO] [stdout] 11 |     pub fn unwrap(self) -> T {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `error` is never read
[INFO] [stdout]   --> src/error.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub struct ExecError {
[INFO] [stdout]    |            --------- field in this struct
[INFO] [stdout] 22 |     kind: ErrorKind,
[INFO] [stdout] 23 |     error: Box<error::Error + Send + Sync>,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ExecError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/error.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 26 | impl ExecError {
[INFO] [stdout]    | -------------- associated function in this implementation
[INFO] [stdout] 27 |     pub fn new<E>(kind: ErrorKind, error: E) -> Self
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Overflow` is never constructed
[INFO] [stdout]   --> src/error.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 54 | pub enum ErrorKind {
[INFO] [stdout]    |          --------- variant in this enum
[INFO] [stdout] 55 |     Overflow,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ErrorKind` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 32 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking memchr v0.1.10
[INFO] [stderr]     Checking log v0.3.5
[INFO] [stderr]     Checking rand v0.3.14
[INFO] [stderr]     Checking aho-corasick v0.5.1
[INFO] [stderr]     Checking regex v0.1.55
[INFO] [stderr]     Checking env_logger v0.3.2
[INFO] [stderr]     Checking quickcheck v0.2.25
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/instruction/add.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 |     };
[INFO] [stdout]    |      ^ help: remove this semicolon
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `error::ExecResult`
[INFO] [stdout]  --> src/instruction/branch.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use error::ExecResult;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/decoder.rs:22:22
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub execute: Box<Fn(&Vec<u32>) -> ExecResult<u32>>,
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub execute: Box<dyn Fn(&Vec<u32>) -> ExecResult<u32>>,
[INFO] [stdout]    |                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/decoder.rs:23:27
[INFO] [stdout]    |
[INFO] [stdout] 23 |     pub branch_taken: Box<Fn(&Vec<u32>) -> bool>,
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 23 |     pub branch_taken: Box<dyn Fn(&Vec<u32>) -> bool>,
[INFO] [stdout]    |                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/error.rs:23:16
[INFO] [stdout]    |
[INFO] [stdout] 23 |     error: Box<error::Error + Send + Sync>,
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 23 |     error: Box<dyn error::Error + Send + Sync>,
[INFO] [stdout]    |                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/error.rs:28:27
[INFO] [stdout]    |
[INFO] [stdout] 28 |         where E: Into<Box<error::Error + Send + Sync>>
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 28 |         where E: Into<Box<dyn error::Error + Send + Sync>>
[INFO] [stdout]    |                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `masked_quickcheck` is never used
[INFO] [stdout]  --> src/quickcheck_extra.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn masked_quickcheck(size: usize) -> QuickCheck<StdGen<rand::ThreadRng>> {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Decodable` is never used
[INFO] [stdout]   --> src/decoded.rs:10:11
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub trait Decodable {
[INFO] [stdout]    |           ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Decoded` is never used
[INFO] [stdout]   --> src/decoded.rs:14:11
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub trait Decoded {
[INFO] [stdout]    |           ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Register` is never constructed
[INFO] [stdout]   --> src/decoded.rs:21:12
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub struct Register(pub u8);
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `inputs`, `outputs`, `execute`, and `branch_taken` are never read
[INFO] [stdout]   --> src/decoder.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub struct Instruction {
[INFO] [stdout]    |            ----------- fields in this struct
[INFO] [stdout] 19 |     pub name: &'static str,
[INFO] [stdout] 20 |     pub inputs: Vec<Register>,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 21 |     pub outputs: Option<Register>,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 22 |     pub execute: Box<Fn(&Vec<u32>) -> ExecResult<u32>>,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 23 |     pub branch_taken: Box<Fn(&Vec<u32>) -> bool>,
[INFO] [stdout]    |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `keys` is never used
[INFO] [stdout]   --> src/decoder.rs:68:12
[INFO] [stdout]    |
[INFO] [stdout] 48 | impl Decoder {
[INFO] [stdout]    | ------------ method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 68 |     pub fn keys(&self) -> Vec<Opcode> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> src/error.rs:7:15
[INFO] [stdout]   |
[INFO] [stdout] 7 |     Exception(ExecError),
[INFO] [stdout]   |     --------- ^^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]   |
[INFO] [stdout] 7 |     Exception(()),
[INFO] [stdout]   |               ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `unwrap` is never used
[INFO] [stdout]   --> src/error.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl<T> ExecResult<T> {
[INFO] [stdout]    | --------------------- method in this implementation
[INFO] [stdout] 11 |     pub fn unwrap(self) -> T {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `error` is never read
[INFO] [stdout]   --> src/error.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub struct ExecError {
[INFO] [stdout]    |            --------- field in this struct
[INFO] [stdout] 22 |     kind: ErrorKind,
[INFO] [stdout] 23 |     error: Box<error::Error + Send + Sync>,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ExecError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.02s
[INFO] running `Command { std: "docker" "inspect" "00250a2aad9e32d1f37a3ca42352d0c291328ca9521657bde05cbd218d197d8a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "00250a2aad9e32d1f37a3ca42352d0c291328ca9521657bde05cbd218d197d8a", kill_on_drop: false }`
[INFO] [stdout] 00250a2aad9e32d1f37a3ca42352d0c291328ca9521657bde05cbd218d197d8a