[INFO] cloning repository https://github.com/YasyaKarasu/RustHW4
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/YasyaKarasu/RustHW4" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FYasyaKarasu%2FRustHW4", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FYasyaKarasu%2FRustHW4'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 85006cc44b27ba0d5f754ac2078ea8fa9657cff1
[INFO] checking YasyaKarasu/RustHW4 against master#c3def263a44e07e09ae6d57abfc8650227fb4972 for pr-118920
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FYasyaKarasu%2FRustHW4" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/YasyaKarasu/RustHW4 on toolchain c3def263a44e07e09ae6d57abfc8650227fb4972
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c3def263a44e07e09ae6d57abfc8650227fb4972" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/YasyaKarasu/RustHW4
[INFO] finished tweaking git repo https://github.com/YasyaKarasu/RustHW4
[INFO] tweaked toml for git repo https://github.com/YasyaKarasu/RustHW4 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/YasyaKarasu/RustHW4 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" "+c3def263a44e07e09ae6d57abfc8650227fb4972" "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 YasyaKarasu/RustHW4 against try#3931cbb869e499bf6db1e4d580cc247efbf183df for pr-118920
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FYasyaKarasu%2FRustHW4" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/YasyaKarasu/RustHW4 on toolchain 3931cbb869e499bf6db1e4d580cc247efbf183df
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3931cbb869e499bf6db1e4d580cc247efbf183df" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/YasyaKarasu/RustHW4
[INFO] finished tweaking git repo https://github.com/YasyaKarasu/RustHW4
[INFO] tweaked toml for git repo https://github.com/YasyaKarasu/RustHW4 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/YasyaKarasu/RustHW4 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" "+3931cbb869e499bf6db1e4d580cc247efbf183df" "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-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+3931cbb869e499bf6db1e4d580cc247efbf183df" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a7cdc7e2628904eb54d7f69b9316f3d0d855d58a468d4fba2013c7803e825b8a
[INFO] running `Command { std: "docker" "start" "-a" "a7cdc7e2628904eb54d7f69b9316f3d0d855d58a468d4fba2013c7803e825b8a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a7cdc7e2628904eb54d7f69b9316f3d0d855d58a468d4fba2013c7803e825b8a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a7cdc7e2628904eb54d7f69b9316f3d0d855d58a468d4fba2013c7803e825b8a", kill_on_drop: false }`
[INFO] [stdout] a7cdc7e2628904eb54d7f69b9316f3d0d855d58a468d4fba2013c7803e825b8a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+3931cbb869e499bf6db1e4d580cc247efbf183df" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7a0b01e0ca83fea5d81e4dbe8d1baca95a744af45afcf5a46fc4339af769678e
[INFO] running `Command { std: "docker" "start" "-a" "7a0b01e0ca83fea5d81e4dbe8d1baca95a744af45afcf5a46fc4339af769678e", kill_on_drop: false }`
[INFO] [stderr]    Compiling futures-channel v0.3.28
[INFO] [stderr]     Checking futures-sink v0.3.28
[INFO] [stderr]     Checking scoped-tls v1.0.1
[INFO] [stderr]    Compiling quote v1.0.33
[INFO] [stderr]     Checking concurrent-queue v2.2.0
[INFO] [stderr]    Compiling syn v2.0.31
[INFO] [stderr]     Checking async-channel v1.9.0
[INFO] [stderr]    Compiling futures-macro v0.3.28
[INFO] [stderr]     Checking futures-util v0.3.28
[INFO] [stderr]     Checking futures-executor v0.3.28
[INFO] [stderr]     Checking futures v0.3.28
[INFO] [stderr]     Checking lecture4 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `dummy_waker` is never used
[INFO] [stdout]   --> src/main.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn dummy_waker() -> Waker {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `dummy_waker` is never used
[INFO] [stdout]   --> src/main.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn dummy_waker() -> Waker {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `VTABLE` is never used
[INFO] [stdout]   --> src/main.rs:16:7
[INFO] [stdout]    |
[INFO] [stdout] 16 | const VTABLE: RawWakerVTable = RawWakerVTable::new(vtable_clone, vtable_wake, vtable_wake_by_ref, vtable_drop);
[INFO] [stdout]    |       ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `VTABLE` is never used
[INFO] [stdout]   --> src/main.rs:16:7
[INFO] [stdout]    |
[INFO] [stdout] 16 | const VTABLE: RawWakerVTable = RawWakerVTable::new(vtable_clone, vtable_wake, vtable_wake_by_ref, vtable_drop);
[INFO] [stdout]    |       ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vtable_clone` is never used
[INFO] [stdout]   --> src/main.rs:18:11
[INFO] [stdout]    |
[INFO] [stdout] 18 | unsafe fn vtable_clone(_p: *const()) -> RawWaker {
[INFO] [stdout]    |           ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vtable_clone` is never used
[INFO] [stdout]   --> src/main.rs:18:11
[INFO] [stdout]    |
[INFO] [stdout] 18 | unsafe fn vtable_clone(_p: *const()) -> RawWaker {
[INFO] [stdout]    |           ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vtable_wake` is never used
[INFO] [stdout]   --> src/main.rs:23:11
[INFO] [stdout]    |
[INFO] [stdout] 23 | unsafe fn vtable_wake(_p: *const()) {
[INFO] [stdout]    |           ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vtable_wake` is never used
[INFO] [stdout]   --> src/main.rs:23:11
[INFO] [stdout]    |
[INFO] [stdout] 23 | unsafe fn vtable_wake(_p: *const()) {
[INFO] [stdout]    |           ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vtable_wake_by_ref` is never used
[INFO] [stdout]   --> src/main.rs:27:11
[INFO] [stdout]    |
[INFO] [stdout] 27 | unsafe fn vtable_wake_by_ref(_p: *const()) {
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vtable_wake_by_ref` is never used
[INFO] [stdout]   --> src/main.rs:27:11
[INFO] [stdout]    |
[INFO] [stdout] 27 | unsafe fn vtable_wake_by_ref(_p: *const()) {
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vtable_drop` is never used
[INFO] [stdout]   --> src/main.rs:31:11
[INFO] [stdout]    |
[INFO] [stdout] 31 | unsafe fn vtable_drop(_p: *const()) {
[INFO] [stdout]    |           ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vtable_drop` is never used
[INFO] [stdout]   --> src/main.rs:31:11
[INFO] [stdout]    |
[INFO] [stdout] 31 | unsafe fn vtable_drop(_p: *const()) {
[INFO] [stdout]    |           ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `signal` is never read
[INFO] [stdout]   --> src/main.rs:95:5
[INFO] [stdout]    |
[INFO] [stdout] 93 | struct Task {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 94 |     future: RefCell<BoxFuture<'static, ()>>,
[INFO] [stdout] 95 |     signal: Arc<Signal>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `signal` is never read
[INFO] [stdout]   --> src/main.rs:95:5
[INFO] [stdout]    |
[INFO] [stdout] 93 | struct Task {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 94 |     future: RefCell<BoxFuture<'static, ()>>,
[INFO] [stdout] 95 |     signal: Arc<Signal>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.05s
[INFO] running `Command { std: "docker" "inspect" "7a0b01e0ca83fea5d81e4dbe8d1baca95a744af45afcf5a46fc4339af769678e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7a0b01e0ca83fea5d81e4dbe8d1baca95a744af45afcf5a46fc4339af769678e", kill_on_drop: false }`
[INFO] [stdout] 7a0b01e0ca83fea5d81e4dbe8d1baca95a744af45afcf5a46fc4339af769678e