[INFO] fetching crate plumbing 1.0.0...
[INFO] checking plumbing-1.0.0 against try#38c2997544af84fe301d600d6896397738163002 for pr-154205-1
[INFO] extracting crate plumbing 1.0.0 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate plumbing 1.0.0
[INFO] finished tweaking crates.io crate plumbing 1.0.0
[INFO] tweaked toml for crates.io crate plumbing 1.0.0 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate plumbing 1.0.0 on toolchain 38c2997544af84fe301d600d6896397738163002
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+38c2997544af84fe301d600d6896397738163002" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+38c2997544af84fe301d600d6896397738163002" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 25 packages to latest compatible versions
[INFO] [stderr]       Adding tokio v0.2.25 (available: v1.50.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+38c2997544af84fe301d600d6896397738163002" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+38c2997544af84fe301d600d6896397738163002" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 833bc406cca710c917fe44daabf97803064980f44edba75875249a65b30dd275
[INFO] running `Command { std: "docker" "start" "-a" "833bc406cca710c917fe44daabf97803064980f44edba75875249a65b30dd275", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "833bc406cca710c917fe44daabf97803064980f44edba75875249a65b30dd275", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "833bc406cca710c917fe44daabf97803064980f44edba75875249a65b30dd275", kill_on_drop: false }`
[INFO] [stdout] 833bc406cca710c917fe44daabf97803064980f44edba75875249a65b30dd275
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+38c2997544af84fe301d600d6896397738163002" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3c241fcef7f09703e83eb5642595f0fc527d4e4aa178b851cd83152e060a72f9
[INFO] running `Command { std: "docker" "start" "-a" "3c241fcef7f09703e83eb5642595f0fc527d4e4aa178b851cd83152e060a72f9", kill_on_drop: false }`
[INFO] [stderr]     Checking futures-core v0.3.32
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking slab v0.4.12
[INFO] [stderr]     Checking futures-sink v0.3.32
[INFO] [stderr]     Checking futures-io v0.3.32
[INFO] [stderr]     Checking pin-project-lite v0.2.17
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]     Checking futures-task v0.3.32
[INFO] [stderr]     Checking memchr v2.8.0
[INFO] [stderr]     Checking num_cpus v1.17.0
[INFO] [stderr]     Checking bytes v0.5.6
[INFO] [stderr]     Checking pin-project-lite v0.1.12
[INFO] [stderr]     Checking futures-channel v0.3.32
[INFO] [stderr]     Checking futures-util v0.3.32
[INFO] [stderr]    Compiling tokio-macros v0.2.6
[INFO] [stderr]    Compiling pin-project-internal v1.1.11
[INFO] [stderr]     Checking tokio v0.2.25
[INFO] [stderr]     Checking futures v0.3.32
[INFO] [stderr]     Checking pin-project v1.1.11
[INFO] [stderr]     Checking foreback v1.1.2
[INFO] [stderr]     Checking plumbing v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused output of future returned by `tokio::task::yield_now` that must be used
[INFO] [stdout]   --> tests/test.rs:92:5
[INFO] [stdout]    |
[INFO] [stdout] 92 |     task::yield_now().await;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: yield_now does nothing unless polled/`await`-ed
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 92 |     let _ = task::yield_now().await;
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused output of future returned by `tokio::task::yield_now` that must be used
[INFO] [stdout]   --> tests/test.rs:93:5
[INFO] [stdout]    |
[INFO] [stdout] 93 |     task::yield_now().await;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: yield_now does nothing unless polled/`await`-ed
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 93 |     let _ = task::yield_now().await;
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 14.46s
[INFO] running `Command { std: "docker" "inspect" "3c241fcef7f09703e83eb5642595f0fc527d4e4aa178b851cd83152e060a72f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c241fcef7f09703e83eb5642595f0fc527d4e4aa178b851cd83152e060a72f9", kill_on_drop: false }`
[INFO] [stdout] 3c241fcef7f09703e83eb5642595f0fc527d4e4aa178b851cd83152e060a72f9