[INFO] cloning repository https://github.com/zju-lx/hw4
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/zju-lx/hw4" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzju-lx%2Fhw4", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzju-lx%2Fhw4'...
[INFO] [stderr] /workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzju-lx%2Fhw4: No space left on device
[WARN] Retrying crate fetch in 3 seconds (attempt 1)
[INFO] cloning repository https://github.com/zju-lx/hw4
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/zju-lx/hw4" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzju-lx%2Fhw4", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzju-lx%2Fhw4'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c2180b297574a3eeb5545511952e8aeb8c7f25a1
[INFO] checking zju-lx/hw4 against master#32cd9114712a24010b0583624dc52ac302194128 for pr-143717
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzju-lx%2Fhw4" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/zju-lx/hw4
[INFO] finished tweaking git repo https://github.com/zju-lx/hw4
[INFO] tweaked toml for git repo https://github.com/zju-lx/hw4 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/zju-lx/hw4 on toolchain 32cd9114712a24010b0583624dc52ac302194128
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+32cd9114712a24010b0583624dc52ac302194128" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/zju-lx/hw4 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" "+32cd9114712a24010b0583624dc52ac302194128" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+32cd9114712a24010b0583624dc52ac302194128" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] aa4ca6341a7e60d06ee418de8cb65bda743413bee18e5ac2767df42288a69100
[INFO] running `Command { std: "docker" "start" "-a" "aa4ca6341a7e60d06ee418de8cb65bda743413bee18e5ac2767df42288a69100", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aa4ca6341a7e60d06ee418de8cb65bda743413bee18e5ac2767df42288a69100", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa4ca6341a7e60d06ee418de8cb65bda743413bee18e5ac2767df42288a69100", kill_on_drop: false }`
[INFO] [stdout] aa4ca6341a7e60d06ee418de8cb65bda743413bee18e5ac2767df42288a69100
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+32cd9114712a24010b0583624dc52ac302194128" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ba8e9c8f1eabff9ae5f5e8835ef16d3bbcb9208a95974d9462086c0b4c465df9
[INFO] running `Command { std: "docker" "start" "-a" "ba8e9c8f1eabff9ae5f5e8835ef16d3bbcb9208a95974d9462086c0b4c465df9", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.66
[INFO] [stderr]    Compiling unicode-ident v1.0.11
[INFO] [stderr]    Compiling futures-core v0.3.28
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling futures-task v0.3.28
[INFO] [stderr]    Compiling futures-channel v0.3.28
[INFO] [stderr]    Compiling crossbeam-utils v0.8.16
[INFO] [stderr]     Checking futures-sink v0.3.28
[INFO] [stderr]    Compiling futures-util v0.3.28
[INFO] [stderr]     Checking pin-project-lite v0.2.13
[INFO] [stderr]     Checking futures-io v0.3.28
[INFO] [stderr]     Checking memchr v2.6.3
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking event-listener v2.5.3
[INFO] [stderr]     Checking scoped-tls v1.0.1
[INFO] [stderr]    Compiling slab v0.4.9
[INFO] [stderr]     Checking concurrent-queue v2.2.0
[INFO] [stderr]     Checking async-channel v1.9.0
[INFO] [stderr]    Compiling quote v1.0.33
[INFO] [stderr]    Compiling syn v2.0.31
[INFO] [stderr]    Compiling futures-macro v0.3.28
[INFO] [stderr]     Checking futures-executor v0.3.28
[INFO] [stderr]     Checking futures v0.3.28
[INFO] [stderr]     Checking hw4 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::thread::JoinHandle`
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::thread::JoinHandle;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread::JoinHandle`
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::thread::JoinHandle;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `state` is never read
[INFO] [stdout]   --> src/main.rs:63:17
[INFO] [stdout]    |
[INFO] [stdout] 63 |                 state = self.cond.wait(state).unwrap();
[INFO] [stdout]    |                 ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `state` is never read
[INFO] [stdout]   --> src/main.rs:63:17
[INFO] [stdout]    |
[INFO] [stdout] 63 |                 state = self.cond.wait(state).unwrap();
[INFO] [stdout]    |                 ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `VTABLE` is never used
[INFO] [stdout]   --> src/main.rs:12:7
[INFO] [stdout]    |
[INFO] [stdout] 12 | const VTABLE: RawWakerVTable = 
[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:12:7
[INFO] [stdout]    |
[INFO] [stdout] 12 | const VTABLE: RawWakerVTable = 
[INFO] [stdout]    |       ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vtable_clone` is never used
[INFO] [stdout]   --> src/main.rs:15:11
[INFO] [stdout]    |
[INFO] [stdout] 15 | 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:15:11
[INFO] [stdout]    |
[INFO] [stdout] 15 | 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:19:11
[INFO] [stdout]    |
[INFO] [stdout] 19 | 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:19:11
[INFO] [stdout]    |
[INFO] [stdout] 19 | 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:21:11
[INFO] [stdout]    |
[INFO] [stdout] 21 | 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:21:11
[INFO] [stdout]    |
[INFO] [stdout] 21 | 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:23:11
[INFO] [stdout]    |
[INFO] [stdout] 23 | 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:23:11
[INFO] [stdout]    |
[INFO] [stdout] 23 | unsafe fn vtable_drop(_p: *const ()) {}
[INFO] [stdout]    |           ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `dummmy_waker` is never used
[INFO] [stdout]   --> src/main.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn dummmy_waker() -> Waker {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `dummmy_waker` is never used
[INFO] [stdout]   --> src/main.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn dummmy_waker() -> Waker {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static variable `Data` should have an upper case name
[INFO] [stdout]   --> src/main.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 26 |     static Data: () = ();
[INFO] [stdout]    |            ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] help: convert the identifier to upper case
[INFO] [stdout]    |
[INFO] [stdout] 26 -     static Data: () = ();
[INFO] [stdout] 26 +     static DATA: () = ();
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static variable `Data` should have an upper case name
[INFO] [stdout]   --> src/main.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 26 |     static Data: () = ();
[INFO] [stdout]    |            ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] help: convert the identifier to upper case
[INFO] [stdout]    |
[INFO] [stdout] 26 -     static Data: () = ();
[INFO] [stdout] 26 +     static DATA: () = ();
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `async_channel::Send` that must be used
[INFO] [stdout]    --> src/main.rs:154:9
[INFO] [stdout]     |
[INFO] [stdout] 154 |         tx.send(());
[INFO] [stdout]     |         ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: futures do nothing unless you `.await` or poll them
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 154 |         let _ = tx.send(());
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `async_channel::Send` that must be used
[INFO] [stdout]    --> src/main.rs:154:9
[INFO] [stdout]     |
[INFO] [stdout] 154 |         tx.send(());
[INFO] [stdout]     |         ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: futures do nothing unless you `.await` or poll them
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 154 |         let _ = tx.send(());
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 8.73s
[INFO] running `Command { std: "docker" "inspect" "ba8e9c8f1eabff9ae5f5e8835ef16d3bbcb9208a95974d9462086c0b4c465df9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ba8e9c8f1eabff9ae5f5e8835ef16d3bbcb9208a95974d9462086c0b4c465df9", kill_on_drop: false }`
[INFO] [stdout] ba8e9c8f1eabff9ae5f5e8835ef16d3bbcb9208a95974d9462086c0b4c465df9
