[INFO] updating cached repository vernonrj/MIPSical
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/vernonrj/MIPSical
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/vernonrj/MIPSical" "work/ex/beta-1.38-1/sources/1.37.0/gh/vernonrj/MIPSical"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/vernonrj/MIPSical'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/vernonrj/MIPSical" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vernonrj/MIPSical"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vernonrj/MIPSical'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7838ffd302ac7db5ed8eb21f0bb74b82f1ae3e31
[INFO] sha for GitHub repo vernonrj/MIPSical: 7838ffd302ac7db5ed8eb21f0bb74b82f1ae3e31
[INFO] validating manifest of vernonrj/MIPSical on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of vernonrj/MIPSical on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing vernonrj/MIPSical
[INFO] finished frobbing vernonrj/MIPSical
[INFO] frobbed toml for vernonrj/MIPSical written to work/ex/beta-1.38-1/sources/1.37.0/gh/vernonrj/MIPSical/Cargo.toml
[INFO] started frobbing vernonrj/MIPSical
[INFO] finished frobbing vernonrj/MIPSical
[INFO] frobbed toml for vernonrj/MIPSical written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vernonrj/MIPSical/Cargo.toml
[INFO] crate vernonrj/MIPSical already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/vernonrj/MIPSical/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing vernonrj/MIPSical against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vernonrj/MIPSical:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] ada13d06f99f20ee8e3278f6d3b4f0fd70b09bfd49c49cc9e134104374cc7cbd
[INFO] running `"docker" "start" "-a" "ada13d06f99f20ee8e3278f6d3b4f0fd70b09bfd49c49cc9e134104374cc7cbd"`
[INFO] [stderr]    Compiling mips v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/decoder.rs:22:22
[INFO] [stderr]    |
[INFO] [stderr] 22 |     pub execute: Box<Fn(&Vec<u32>) -> ExecResult<u32>>,
[INFO] [stderr]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(&Vec<u32>) -> ExecResult<u32>`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/decoder.rs:23:27
[INFO] [stderr]    |
[INFO] [stderr] 23 |     pub branch_taken: Box<Fn(&Vec<u32>) -> bool>,
[INFO] [stderr]    |                           ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(&Vec<u32>) -> bool`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `error::ExecResult`
[INFO] [stderr]  --> src/instruction/branch.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use error::ExecResult;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/error.rs:23:16
[INFO] [stderr]    |
[INFO] [stderr] 23 |     error: Box<error::Error + Send + Sync>,
[INFO] [stderr]    |                ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error + Send + Sync`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/error.rs:28:27
[INFO] [stderr]    |
[INFO] [stderr] 28 |         where E: Into<Box<error::Error + Send + Sync>>
[INFO] [stderr]    |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error + Send + Sync`
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Normal`
[INFO] [stderr]  --> src/decoded.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     Normal(u8),
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Special`
[INFO] [stderr]  --> src/decoded.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 |     Special(u8),
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `RegImm`
[INFO] [stderr]  --> src/decoded.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 |     RegImm(u8),
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Register`
[INFO] [stderr]   --> src/decoded.rs:21:1
[INFO] [stderr]    |
[INFO] [stderr] 21 | pub struct Register(pub u8);
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `RS`
[INFO] [stderr]   --> src/decoder.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     RS,
[INFO] [stderr]    |     ^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `RT`
[INFO] [stderr]   --> src/decoder.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     RT,
[INFO] [stderr]    |     ^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `RD`
[INFO] [stderr]   --> src/decoder.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     RD,
[INFO] [stderr]    |     ^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `SA`
[INFO] [stderr]   --> src/decoder.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 |     SA,
[INFO] [stderr]    |     ^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Immediate`
[INFO] [stderr]   --> src/decoder.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 |     Immediate,
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Decoder`
[INFO] [stderr]   --> src/decoder.rs:44:1
[INFO] [stderr]    |
[INFO] [stderr] 44 | pub struct Decoder {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/decoder.rs:49:5
[INFO] [stderr]    |
[INFO] [stderr] 49 |     pub fn new() -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `decode`
[INFO] [stderr]   --> src/decoder.rs:57:5
[INFO] [stderr]    |
[INFO] [stderr] 57 |     pub fn decode(&self, command: Fetched) -> Option<&Instruction> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `keys`
[INFO] [stderr]   --> src/decoder.rs:68:5
[INFO] [stderr]    |
[INFO] [stderr] 68 |     pub fn keys(&self) -> Vec<Opcode> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Fetched`
[INFO] [stderr]   --> src/decoder.rs:73:1
[INFO] [stderr]    |
[INFO] [stderr] 73 | pub struct Fetched(pub u32);
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `extract_31_26`
[INFO] [stderr]   --> src/decoder.rs:75:1
[INFO] [stderr]    |
[INFO] [stderr] 75 | pub fn extract_31_26(bitfield: u32) -> u8 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `extract_25_21`
[INFO] [stderr]   --> src/decoder.rs:78:1
[INFO] [stderr]    |
[INFO] [stderr] 78 | pub fn extract_25_21(bitfield: u32) -> u8 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `extract_20_16`
[INFO] [stderr]   --> src/decoder.rs:81:1
[INFO] [stderr]    |
[INFO] [stderr] 81 | pub fn extract_20_16(bitfield: u32) -> u8 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `extract_15_11`
[INFO] [stderr]   --> src/decoder.rs:84:1
[INFO] [stderr]    |
[INFO] [stderr] 84 | pub fn extract_15_11(bitfield: u32) -> u8 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `extract_15_0`
[INFO] [stderr]   --> src/decoder.rs:87:1
[INFO] [stderr]    |
[INFO] [stderr] 87 | pub fn extract_15_0(bitfield: u32) -> u16 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `extract_10_6`
[INFO] [stderr]   --> src/decoder.rs:90:1
[INFO] [stderr]    |
[INFO] [stderr] 90 | pub fn extract_10_6(bitfield: u32) -> u8 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `extract_5_0`
[INFO] [stderr]   --> src/decoder.rs:93:1
[INFO] [stderr]    |
[INFO] [stderr] 93 | pub fn extract_5_0(bitfield: u32) -> u8 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `extract_25_0`
[INFO] [stderr]   --> src/decoder.rs:96:1
[INFO] [stderr]    |
[INFO] [stderr] 96 | pub fn extract_25_0(bitfield: u32) -> u32 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `register`
[INFO] [stderr]  --> src/instruction/add.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub fn register(m: &mut HashMap<Opcode, Instruction>) {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `register`
[INFO] [stderr]  --> src/instruction/and.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub fn register(m: &mut HashMap<Opcode, Instruction>) {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `register`
[INFO] [stderr]  --> src/instruction/branch.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub fn register(m: &mut HashMap<Opcode, Instruction>) {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `register`
[INFO] [stderr]  --> src/instruction/shift.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub fn register(m: &mut HashMap<Opcode, Instruction>) {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Success`
[INFO] [stderr]  --> src/error.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     Success(T),
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Exception`
[INFO] [stderr]  --> src/error.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 |     Exception(ExecError),
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `unwrap`
[INFO] [stderr]   --> src/error.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     pub fn unwrap(self) -> T {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/error.rs:27:5
[INFO] [stderr]    |
[INFO] [stderr] 27 | /     pub fn new<E>(kind: ErrorKind, error: E) -> Self
[INFO] [stderr] 28 | |         where E: Into<Box<error::Error + Send + Sync>>
[INFO] [stderr] 29 | |     {
[INFO] [stderr] 30 | |         ExecError {
[INFO] [stderr] ...  |
[INFO] [stderr] 33 | |         }
[INFO] [stderr] 34 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Overflow`
[INFO] [stderr]   --> src/error.rs:55:5
[INFO] [stderr]    |
[INFO] [stderr] 55 |     Overflow,
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.76s
[INFO] running `"docker" "inspect" "ada13d06f99f20ee8e3278f6d3b4f0fd70b09bfd49c49cc9e134104374cc7cbd"`
[INFO] running `"docker" "rm" "-f" "ada13d06f99f20ee8e3278f6d3b4f0fd70b09bfd49c49cc9e134104374cc7cbd"`
[INFO] [stdout] ada13d06f99f20ee8e3278f6d3b4f0fd70b09bfd49c49cc9e134104374cc7cbd
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vernonrj/MIPSical:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 84a03052e411b8058b0bf6cc9e39f8d5a8a6b75109fa95d11071763b8a4158ed
[INFO] running `"docker" "start" "-a" "84a03052e411b8058b0bf6cc9e39f8d5a8a6b75109fa95d11071763b8a4158ed"`
[INFO] [stderr]    Compiling quickcheck v0.2.27
[INFO] [stderr]    Compiling mips v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/decoder.rs:22:22
[INFO] [stderr]    |
[INFO] [stderr] 22 |     pub execute: Box<Fn(&Vec<u32>) -> ExecResult<u32>>,
[INFO] [stderr]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(&Vec<u32>) -> ExecResult<u32>`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/decoder.rs:23:27
[INFO] [stderr]    |
[INFO] [stderr] 23 |     pub branch_taken: Box<Fn(&Vec<u32>) -> bool>,
[INFO] [stderr]    |                           ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(&Vec<u32>) -> bool`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `error::ExecResult`
[INFO] [stderr]  --> src/instruction/branch.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use error::ExecResult;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/error.rs:23:16
[INFO] [stderr]    |
[INFO] [stderr] 23 |     error: Box<error::Error + Send + Sync>,
[INFO] [stderr]    |                ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error + Send + Sync`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/error.rs:28:27
[INFO] [stderr]    |
[INFO] [stderr] 28 |         where E: Into<Box<error::Error + Send + Sync>>
[INFO] [stderr]    |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error + Send + Sync`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `masked_quickcheck`
[INFO] [stderr]  --> src/quickcheck_extra.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn masked_quickcheck(size: usize) -> QuickCheck<StdGen<rand::ThreadRng>> {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Register`
[INFO] [stderr]   --> src/decoded.rs:21:1
[INFO] [stderr]    |
[INFO] [stderr] 21 | pub struct Register(pub u8);
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `keys`
[INFO] [stderr]   --> src/decoder.rs:68:5
[INFO] [stderr]    |
[INFO] [stderr] 68 |     pub fn keys(&self) -> Vec<Opcode> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `unwrap`
[INFO] [stderr]   --> src/error.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     pub fn unwrap(self) -> T {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.07s
[INFO] running `"docker" "inspect" "84a03052e411b8058b0bf6cc9e39f8d5a8a6b75109fa95d11071763b8a4158ed"`
[INFO] running `"docker" "rm" "-f" "84a03052e411b8058b0bf6cc9e39f8d5a8a6b75109fa95d11071763b8a4158ed"`
[INFO] [stdout] 84a03052e411b8058b0bf6cc9e39f8d5a8a6b75109fa95d11071763b8a4158ed
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vernonrj/MIPSical:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 4057aa6d6e47d5c120a074a5d2b6df2fbcdc5ca83c658ff69149049ed7bc2ffe
[INFO] running `"docker" "start" "-a" "4057aa6d6e47d5c120a074a5d2b6df2fbcdc5ca83c658ff69149049ed7bc2ffe"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/mips-07bf0cce412e303c
[INFO] [stdout] 
[INFO] [stdout] running 18 tests
[INFO] [stdout] test decoder::test_extract_10_6 ... ok
[INFO] [stdout] test decoder::test_extract_15_0 ... ok
[INFO] [stdout] test decoder::test_extract_15_11 ... ok
[INFO] [stdout] test decoder::test_extract_20_16 ... ok
[INFO] [stdout] test decoder::test_extract_25_21 ... ok
[INFO] [stdout] test decoder::test_extract_31_26 ... ok
[INFO] [stdout] test decoder::test_extract_5_0 ... ok
[INFO] [stdout] test decoder::test_extract_25_0 ... ok
[INFO] [stdout] test instruction::add::test::add_decode ... ok
[INFO] [stdout] test instruction::add::test::addi_decode ... ok
[INFO] [stdout] test instruction::and::test::and_decode ... ok
[INFO] [stdout] test instruction::and::test::andi_decode ... ok
[INFO] [stdout] test instruction::branch::test::beq_decode ... ok
[INFO] [stdout] test instruction::shift::test::sll_decode ... ok
[INFO] [stdout] test instruction::add::test::addiu_decode ... ok
[INFO] [stdout] test instruction::shift::test::srl_decode ... ok
[INFO] [stdout] test instruction::add::test::addu_decode ... ok
[INFO] [stdout] test instruction::shift::test::sra_decode ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 18 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "4057aa6d6e47d5c120a074a5d2b6df2fbcdc5ca83c658ff69149049ed7bc2ffe"`
[INFO] running `"docker" "rm" "-f" "4057aa6d6e47d5c120a074a5d2b6df2fbcdc5ca83c658ff69149049ed7bc2ffe"`
[INFO] [stdout] 4057aa6d6e47d5c120a074a5d2b6df2fbcdc5ca83c658ff69149049ed7bc2ffe