[INFO] cloning repository https://github.com/NicholasYang21/sys_programming_learning
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/NicholasYang21/sys_programming_learning" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNicholasYang21%2Fsys_programming_learning", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNicholasYang21%2Fsys_programming_learning'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 52e700b1c38d478931e927648342a81d9caf4abb
[INFO] checking NicholasYang21/sys_programming_learning against master#d3dd34a1d4a7e25a92a0d65994bb01a5d17c59ee for pr-127481-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNicholasYang21%2Fsys_programming_learning" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/NicholasYang21/sys_programming_learning on toolchain d3dd34a1d4a7e25a92a0d65994bb01a5d17c59ee
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d3dd34a1d4a7e25a92a0d65994bb01a5d17c59ee" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/NicholasYang21/sys_programming_learning
[INFO] finished tweaking git repo https://github.com/NicholasYang21/sys_programming_learning
[INFO] tweaked toml for git repo https://github.com/NicholasYang21/sys_programming_learning written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/NicholasYang21/sys_programming_learning 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" "+d3dd34a1d4a7e25a92a0d65994bb01a5d17c59ee" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking NicholasYang21/sys_programming_learning against try#3d1ad905b56a11961be37df7dc5e56be58204dd8 for pr-127481-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNicholasYang21%2Fsys_programming_learning" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/NicholasYang21/sys_programming_learning on toolchain 3d1ad905b56a11961be37df7dc5e56be58204dd8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3d1ad905b56a11961be37df7dc5e56be58204dd8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/NicholasYang21/sys_programming_learning
[INFO] finished tweaking git repo https://github.com/NicholasYang21/sys_programming_learning
[INFO] tweaked toml for git repo https://github.com/NicholasYang21/sys_programming_learning written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/NicholasYang21/sys_programming_learning 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" "+3d1ad905b56a11961be37df7dc5e56be58204dd8" "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-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:dff56e7819e73ed36160586b3445e93eb0be776c16704aeeded9c3fb668b2384" "/opt/rustwide/cargo-home/bin/cargo" "+3d1ad905b56a11961be37df7dc5e56be58204dd8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4a0de3f067e7cdf40c15493001ddf9c883a0c7719c76fc7e49ed58fe316943ec
[INFO] running `Command { std: "docker" "start" "-a" "4a0de3f067e7cdf40c15493001ddf9c883a0c7719c76fc7e49ed58fe316943ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4a0de3f067e7cdf40c15493001ddf9c883a0c7719c76fc7e49ed58fe316943ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4a0de3f067e7cdf40c15493001ddf9c883a0c7719c76fc7e49ed58fe316943ec", kill_on_drop: false }`
[INFO] [stdout] 4a0de3f067e7cdf40c15493001ddf9c883a0c7719c76fc7e49ed58fe316943ec
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "-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:dff56e7819e73ed36160586b3445e93eb0be776c16704aeeded9c3fb668b2384" "/opt/rustwide/cargo-home/bin/cargo" "+3d1ad905b56a11961be37df7dc5e56be58204dd8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 564fbee65d84e9b07d02294aed23a04fa1f06f71af62276a56883aaa0cb1bdc5
[INFO] running `Command { std: "docker" "start" "-a" "564fbee65d84e9b07d02294aed23a04fa1f06f71af62276a56883aaa0cb1bdc5", kill_on_drop: false }`
[INFO] [stderr]     Checking sys_programming_learning v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/chip_8_emulator.rs:34:17
[INFO] [stdout]    |
[INFO] [stdout] 34 |             let y = ((op_code & 0x00F0) >> 4) as u8;
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `addr`
[INFO] [stdout]   --> src/chip_8_emulator.rs:56:24
[INFO] [stdout]    |
[INFO] [stdout] 56 |     fn call(&mut self, addr: u8) {}
[INFO] [stdout]    |                        ^^^^ help: if this is intentional, prefix it with an underscore: `_addr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `reg`
[INFO] [stdout]   --> src/chip_8_emulator.rs:58:22
[INFO] [stdout]    |
[INFO] [stdout] 58 |     fn je(&mut self, reg: u8, cmp: u8) {}
[INFO] [stdout]    |                      ^^^ help: if this is intentional, prefix it with an underscore: `_reg`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cmp`
[INFO] [stdout]   --> src/chip_8_emulator.rs:58:31
[INFO] [stdout]    |
[INFO] [stdout] 58 |     fn je(&mut self, reg: u8, cmp: u8) {}
[INFO] [stdout]    |                               ^^^ help: if this is intentional, prefix it with an underscore: `_cmp`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/chip_8_emulator.rs:34:17
[INFO] [stdout]    |
[INFO] [stdout] 34 |             let y = ((op_code & 0x00F0) >> 4) as u8;
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `addr`
[INFO] [stdout]   --> src/chip_8_emulator.rs:56:24
[INFO] [stdout]    |
[INFO] [stdout] 56 |     fn call(&mut self, addr: u8) {}
[INFO] [stdout]    |                        ^^^^ help: if this is intentional, prefix it with an underscore: `_addr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `reg`
[INFO] [stdout]   --> src/chip_8_emulator.rs:58:22
[INFO] [stdout]    |
[INFO] [stdout] 58 |     fn je(&mut self, reg: u8, cmp: u8) {}
[INFO] [stdout]    |                      ^^^ help: if this is intentional, prefix it with an underscore: `_reg`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cmp`
[INFO] [stdout]   --> src/chip_8_emulator.rs:58:31
[INFO] [stdout]    |
[INFO] [stdout] 58 |     fn je(&mut self, reg: u8, cmp: u8) {}
[INFO] [stdout]    |                               ^^^ help: if this is intentional, prefix it with an underscore: `_cmp`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `registers`, `stack`, and `stack_pointer` are never read
[INFO] [stdout]  --> src/chip_8_emulator.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Chip8 {
[INFO] [stdout]   |            ----- fields in this struct
[INFO] [stdout] 2 |     registers: [u8; 16],
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 3 |     memory: [u8; 4096],
[INFO] [stdout] 4 |     stack: [u16; 12],
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 5 |     stack_pointer: u8,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `registers`, `stack`, and `stack_pointer` are never read
[INFO] [stdout]  --> src/chip_8_emulator.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Chip8 {
[INFO] [stdout]   |            ----- fields in this struct
[INFO] [stdout] 2 |     registers: [u8; 16],
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 3 |     memory: [u8; 4096],
[INFO] [stdout] 4 |     stack: [u16; 12],
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 5 |     stack_pointer: u8,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.19s
[INFO] running `Command { std: "docker" "inspect" "564fbee65d84e9b07d02294aed23a04fa1f06f71af62276a56883aaa0cb1bdc5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "564fbee65d84e9b07d02294aed23a04fa1f06f71af62276a56883aaa0cb1bdc5", kill_on_drop: false }`
[INFO] [stdout] 564fbee65d84e9b07d02294aed23a04fa1f06f71af62276a56883aaa0cb1bdc5