[INFO] fetching crate ctrlc-async 3.2.2...
[INFO] checking ctrlc-async-3.2.2 against try#cac44d9528e3bbbdaa1537d187bd489ccc5de18c for pr-91141
[INFO] extracting crate ctrlc-async 3.2.2 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate ctrlc-async 3.2.2 on toolchain cac44d9528e3bbbdaa1537d187bd489ccc5de18c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ctrlc-async 3.2.2
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate ctrlc-async 3.2.2
[INFO] tweaked toml for crates.io crate ctrlc-async 3.2.2 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate crates.io crate ctrlc-async 3.2.2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d34a95ade500278371b44c370ee399ec0a16a2849ceab859f1435a837789dbc9
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "d34a95ade500278371b44c370ee399ec0a16a2849ceab859f1435a837789dbc9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d34a95ade500278371b44c370ee399ec0a16a2849ceab859f1435a837789dbc9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d34a95ade500278371b44c370ee399ec0a16a2849ceab859f1435a837789dbc9", kill_on_drop: false }`
[INFO] [stdout] d34a95ade500278371b44c370ee399ec0a16a2849ceab859f1435a837789dbc9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 3a3f71283a4ea6995e4943cefc809631070adb5a9fe3e4da64426f1a36d7935f
[INFO] running `Command { std: "docker" "start" "-a" "3a3f71283a4ea6995e4943cefc809631070adb5a9fe3e4da64426f1a36d7935f", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.30
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.80
[INFO] [stderr]    Compiling libc v0.2.104
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]    Compiling tokio v1.12.0
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]     Checking nix v0.23.0
[INFO] [stderr]    Compiling tokio-macros v1.5.0
[INFO] [stderr]     Checking ctrlc-async v3.2.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `must_use` attribute on `async` functions applies to the anonymous `Future` returned by the function, not the value within
[INFO] [stdout]   --> src/helper.rs:57:1
[INFO] [stdout]    |
[INFO] [stdout] 57 |   #[must_use = "this `Option` should be handled"]
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 58 | / pub async fn timeout<F>(duration: Duration, future: F) -> Option<F::Output>
[INFO] [stdout] 59 | | where F: Future
[INFO] [stdout] 60 | | {
[INFO] [stdout] 61 | |     #[cfg(feature = "tokio")]
[INFO] [stdout] ...  |
[INFO] [stdout] 71 | |     };
[INFO] [stdout] 72 | | }
[INFO] [stdout]    | |_- this attribute does nothing, the `Future`s returned by async functions are already `must_use`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `must_use` attribute on `async` functions applies to the anonymous `Future` returned by the function, not the value within
[INFO] [stdout]   --> src/helper.rs:57:1
[INFO] [stdout]    |
[INFO] [stdout] 57 |   #[must_use = "this `Option` should be handled"]
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 58 | / pub async fn timeout<F>(duration: Duration, future: F) -> Option<F::Output>
[INFO] [stdout] 59 | | where F: Future
[INFO] [stdout] 60 | | {
[INFO] [stdout] 61 | |     #[cfg(feature = "tokio")]
[INFO] [stdout] ...  |
[INFO] [stdout] 71 | |     };
[INFO] [stdout] 72 | | }
[INFO] [stdout]    | |_- this attribute does nothing, the `Future`s returned by async functions are already `must_use`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 14.50s
[INFO] running `Command { std: "docker" "inspect" "3a3f71283a4ea6995e4943cefc809631070adb5a9fe3e4da64426f1a36d7935f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3a3f71283a4ea6995e4943cefc809631070adb5a9fe3e4da64426f1a36d7935f", kill_on_drop: false }`
[INFO] [stdout] 3a3f71283a4ea6995e4943cefc809631070adb5a9fe3e4da64426f1a36d7935f