[INFO] fetching crate natpmp 0.3.1...
[INFO] checking natpmp-0.3.1 against try#3d9fdbff4f377de96b3a51174e7a64086bee9a5c for pr-81477
[INFO] extracting crate natpmp 0.3.1 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate natpmp 0.3.1 on toolchain 3d9fdbff4f377de96b3a51174e7a64086bee9a5c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3d9fdbff4f377de96b3a51174e7a64086bee9a5c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate natpmp 0.3.1
[INFO] finished tweaking crates.io crate natpmp 0.3.1
[INFO] tweaked toml for crates.io crate natpmp 0.3.1 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate crates.io crate natpmp 0.3.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3d9fdbff4f377de96b3a51174e7a64086bee9a5c" "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-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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:ea7d7bff36b2ba8ce4de8bba1d2dea90376bc481f1a945a913994a8c492e40c1" "/opt/rustwide/cargo-home/bin/cargo" "+3d9fdbff4f377de96b3a51174e7a64086bee9a5c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 916de5d92d87d57bbc6dc12c5948859a4141136b1e7a9fb206352aca75720625
[INFO] running `Command { std: "docker" "start" "-a" "916de5d92d87d57bbc6dc12c5948859a4141136b1e7a9fb206352aca75720625", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "916de5d92d87d57bbc6dc12c5948859a4141136b1e7a9fb206352aca75720625", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "916de5d92d87d57bbc6dc12c5948859a4141136b1e7a9fb206352aca75720625", kill_on_drop: false }`
[INFO] [stdout] 916de5d92d87d57bbc6dc12c5948859a4141136b1e7a9fb206352aca75720625
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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:ea7d7bff36b2ba8ce4de8bba1d2dea90376bc481f1a945a913994a8c492e40c1" "/opt/rustwide/cargo-home/bin/cargo" "+3d9fdbff4f377de96b3a51174e7a64086bee9a5c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8bb05f16ec99425688be167c3af18baa44bfda0d0bbe7e3d419195058a513554
[INFO] running `Command { std: "docker" "start" "-a" "8bb05f16ec99425688be167c3af18baa44bfda0d0bbe7e3d419195058a513554", kill_on_drop: false }`
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling tokio v1.6.0
[INFO] [stderr]    Compiling natpmp v0.3.1 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]     Checking mio v0.7.11
[INFO] [stderr]    Compiling async-trait v0.1.50
[INFO] [stdout] error: cannot find attribute `tokio_main` in this scope
[INFO] [stdout]  --> examples/async_udp.rs:3:3
[INFO] [stdout]   |
[INFO] [stdout] 3 | #[tokio_main]
[INFO] [stdout]   |   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0728]: `await` is only allowed inside `async` functions and blocks
[INFO] [stdout]  --> examples/async_udp.rs:5:13
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn main() -> Result<()> {
[INFO] [stdout]   |    ---- this is not `async`
[INFO] [stdout] 5 |     let n = new_tokio_natpmp().await?;
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^^^^^^^^^ only allowed inside `async` functions and blocks
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0728]: `await` is only allowed inside `async` functions and blocks
[INFO] [stdout]  --> examples/async_udp.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |   fn main() -> Result<()> {
[INFO] [stdout]   |      ---- this is not `async`
[INFO] [stdout] 5 |       let n = new_tokio_natpmp().await?;
[INFO] [stdout] 6 | /     n.send_port_mapping_request(Protocol::UDP, 4020, 4020, 30)
[INFO] [stdout] 7 | |         .await?;
[INFO] [stdout]   | |______________^ only allowed inside `async` functions and blocks
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0728]: `await` is only allowed inside `async` functions and blocks
[INFO] [stdout]  --> examples/async_udp.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn main() -> Result<()> {
[INFO] [stdout]   |    ---- this is not `async`
[INFO] [stdout] ...
[INFO] [stdout] 8 |     match n.read_response_or_retry().await? {
[INFO] [stdout]   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ only allowed inside `async` functions and blocks
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0728`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `natpmp`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "8bb05f16ec99425688be167c3af18baa44bfda0d0bbe7e3d419195058a513554", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8bb05f16ec99425688be167c3af18baa44bfda0d0bbe7e3d419195058a513554", kill_on_drop: false }`
[INFO] [stdout] 8bb05f16ec99425688be167c3af18baa44bfda0d0bbe7e3d419195058a513554