[INFO] updating cached repository ratschance/chip-8
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/ratschance/chip-8
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/ratschance/chip-8" "work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/ratschance/chip-8"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/ratschance/chip-8'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ratschance/chip-8" "work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/ratschance/chip-8"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/ratschance/chip-8'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9b221f6bd13821f64ef713b684bc1f027057a22d
[INFO] sha for GitHub repo ratschance/chip-8: 9b221f6bd13821f64ef713b684bc1f027057a22d
[INFO] validating manifest of ratschance/chip-8 on toolchain master#e305df1846a6d985315917ae0c81b74af8b4e641
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of ratschance/chip-8 on toolchain try#99a7498759a22b5684caf798a98b7e90ad9d2443
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing ratschance/chip-8
[INFO] finished frobbing ratschance/chip-8
[INFO] frobbed toml for ratschance/chip-8 written to work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/ratschance/chip-8/Cargo.toml
[INFO] started frobbing ratschance/chip-8
[INFO] finished frobbing ratschance/chip-8
[INFO] frobbed toml for ratschance/chip-8 written to work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/ratschance/chip-8/Cargo.toml
[INFO] crate ratschance/chip-8 already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking ratschance/chip-8 against try#99a7498759a22b5684caf798a98b7e90ad9d2443 for pr-60039-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-60039-1/worker-4/try#99a7498759a22b5684caf798a98b7e90ad9d2443:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/ratschance/chip-8:/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=forbid" "-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" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 5c9b3b3f3b99e1be93bee9c476023c08d0a543efe1a8a74730ee777f5013f820
[INFO] running `"docker" "start" "-a" "5c9b3b3f3b99e1be93bee9c476023c08d0a543efe1a8a74730ee777f5013f820"`
[INFO] [stderr]     Checking chip-8 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `loc`
[INFO] [stderr]   --> src/cpu.rs:59:21
[INFO] [stderr]    |
[INFO] [stderr] 59 |                 let loc = opcode & 0xfff;
[INFO] [stderr]    |                     ^^^ help: consider prefixing with an underscore: `_loc`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loc`
[INFO] [stderr]   --> src/cpu.rs:64:21
[INFO] [stderr]    |
[INFO] [stderr] 64 |                 let loc = opcode & 0xfff;
[INFO] [stderr]    |                     ^^^ help: consider prefixing with an underscore: `_loc`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loc`
[INFO] [stderr]    --> src/cpu.rs:121:21
[INFO] [stderr]     |
[INFO] [stderr] 121 |                 let loc = opcode & 0xfff;
[INFO] [stderr]     |                     ^^^ help: consider prefixing with an underscore: `_loc`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/cpu.rs:126:21
[INFO] [stderr]     |
[INFO] [stderr] 126 |                 let x = get_nibble(2, opcode);
[INFO] [stderr]     |                     ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `val`
[INFO] [stderr]    --> src/cpu.rs:127:21
[INFO] [stderr]     |
[INFO] [stderr] 127 |                 let val = opcode & 0xff;
[INFO] [stderr]     |                     ^^^ help: consider prefixing with an underscore: `_val`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/cpu.rs:132:21
[INFO] [stderr]     |
[INFO] [stderr] 132 |                 let x = get_nibble(2, opcode);
[INFO] [stderr]     |                     ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]    --> src/cpu.rs:133:21
[INFO] [stderr]     |
[INFO] [stderr] 133 |                 let y = get_nibble(1, opcode);
[INFO] [stderr]     |                     ^ help: consider prefixing with an underscore: `_y`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stderr]    --> src/cpu.rs:134:21
[INFO] [stderr]     |
[INFO] [stderr] 134 |                 let n = get_nibble(0, opcode);
[INFO] [stderr]     |                     ^ help: consider prefixing with an underscore: `_n`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/cpu.rs:139:21
[INFO] [stderr]     |
[INFO] [stderr] 139 |                 let x = get_nibble(2, opcode);
[INFO] [stderr]     |                     ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Cpu`
[INFO] [stderr]  --> src/cpu.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | struct Cpu {
[INFO] [stderr]   | ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Registers`
[INFO] [stderr]  --> src/cpu.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | struct Registers {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `initialize`
[INFO] [stderr]   --> src/cpu.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     fn initialize() -> Registers {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `initialize`
[INFO] [stderr]   --> src/cpu.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn initialize() -> Cpu {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `process_opcode`
[INFO] [stderr]   --> src/cpu.rs:39:5
[INFO] [stderr]    |
[INFO] [stderr] 39 |     fn process_opcode(&mut self, opcode: u16) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `process_opcode_8`
[INFO] [stderr]    --> src/cpu.rs:162:5
[INFO] [stderr]     |
[INFO] [stderr] 162 |     fn process_opcode_8(&mut self, x: usize, y: usize, op: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `process_opcode_f`
[INFO] [stderr]    --> src/cpu.rs:224:5
[INFO] [stderr]     |
[INFO] [stderr] 224 |     fn process_opcode_f(&mut self, x: usize, op: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_nibble`
[INFO] [stderr]    --> src/cpu.rs:271:1
[INFO] [stderr]     |
[INFO] [stderr] 271 | fn get_nibble(index: u8, value: u16) -> usize {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loc`
[INFO] [stderr]   --> src/cpu.rs:59:21
[INFO] [stderr]    |
[INFO] [stderr] 59 |                 let loc = opcode & 0xfff;
[INFO] [stderr]    |                     ^^^ help: consider prefixing with an underscore: `_loc`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loc`
[INFO] [stderr]   --> src/cpu.rs:64:21
[INFO] [stderr]    |
[INFO] [stderr] 64 |                 let loc = opcode & 0xfff;
[INFO] [stderr]    |                     ^^^ help: consider prefixing with an underscore: `_loc`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loc`
[INFO] [stderr]    --> src/cpu.rs:121:21
[INFO] [stderr]     |
[INFO] [stderr] 121 |                 let loc = opcode & 0xfff;
[INFO] [stderr]     |                     ^^^ help: consider prefixing with an underscore: `_loc`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/cpu.rs:126:21
[INFO] [stderr]     |
[INFO] [stderr] 126 |                 let x = get_nibble(2, opcode);
[INFO] [stderr]     |                     ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `val`
[INFO] [stderr]    --> src/cpu.rs:127:21
[INFO] [stderr]     |
[INFO] [stderr] 127 |                 let val = opcode & 0xff;
[INFO] [stderr]     |                     ^^^ help: consider prefixing with an underscore: `_val`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/cpu.rs:132:21
[INFO] [stderr]     |
[INFO] [stderr] 132 |                 let x = get_nibble(2, opcode);
[INFO] [stderr]     |                     ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]    --> src/cpu.rs:133:21
[INFO] [stderr]     |
[INFO] [stderr] 133 |                 let y = get_nibble(1, opcode);
[INFO] [stderr]     |                     ^ help: consider prefixing with an underscore: `_y`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stderr]    --> src/cpu.rs:134:21
[INFO] [stderr]     |
[INFO] [stderr] 134 |                 let n = get_nibble(0, opcode);
[INFO] [stderr]     |                     ^ help: consider prefixing with an underscore: `_n`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/cpu.rs:139:21
[INFO] [stderr]     |
[INFO] [stderr] 139 |                 let x = get_nibble(2, opcode);
[INFO] [stderr]     |                     ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Cpu`
[INFO] [stderr]  --> src/cpu.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | struct Cpu {
[INFO] [stderr]   | ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Registers`
[INFO] [stderr]  --> src/cpu.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | struct Registers {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `initialize`
[INFO] [stderr]   --> src/cpu.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     fn initialize() -> Registers {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `initialize`
[INFO] [stderr]   --> src/cpu.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn initialize() -> Cpu {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `process_opcode`
[INFO] [stderr]   --> src/cpu.rs:39:5
[INFO] [stderr]    |
[INFO] [stderr] 39 |     fn process_opcode(&mut self, opcode: u16) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `process_opcode_8`
[INFO] [stderr]    --> src/cpu.rs:162:5
[INFO] [stderr]     |
[INFO] [stderr] 162 |     fn process_opcode_8(&mut self, x: usize, y: usize, op: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `process_opcode_f`
[INFO] [stderr]    --> src/cpu.rs:224:5
[INFO] [stderr]     |
[INFO] [stderr] 224 |     fn process_opcode_f(&mut self, x: usize, op: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_nibble`
[INFO] [stderr]    --> src/cpu.rs:271:1
[INFO] [stderr]     |
[INFO] [stderr] 271 | fn get_nibble(index: u8, value: u16) -> usize {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.62s
[INFO] running `"docker" "inspect" "5c9b3b3f3b99e1be93bee9c476023c08d0a543efe1a8a74730ee777f5013f820"`
[INFO] running `"docker" "rm" "-f" "5c9b3b3f3b99e1be93bee9c476023c08d0a543efe1a8a74730ee777f5013f820"`
[INFO] [stdout] 5c9b3b3f3b99e1be93bee9c476023c08d0a543efe1a8a74730ee777f5013f820