[INFO] fetching crate schedwalk 0.1.0...
[INFO] checking schedwalk-0.1.0 against master#1f12b9b0fdbe735968ac002792a720f0ba4faca6 for crater-rollup-uwu
[INFO] extracting crate schedwalk 0.1.0 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate schedwalk 0.1.0 on toolchain 1f12b9b0fdbe735968ac002792a720f0ba4faca6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate schedwalk 0.1.0
[INFO] finished tweaking crates.io crate schedwalk 0.1.0
[INFO] tweaked toml for crates.io crate schedwalk 0.1.0 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 20 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b8c5d724d60f0d7493254cbf5f79724ad5f7f2a090d18b5407908db98bfc0869
[INFO] running `Command { std: "docker" "start" "-a" "b8c5d724d60f0d7493254cbf5f79724ad5f7f2a090d18b5407908db98bfc0869", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b8c5d724d60f0d7493254cbf5f79724ad5f7f2a090d18b5407908db98bfc0869", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b8c5d724d60f0d7493254cbf5f79724ad5f7f2a090d18b5407908db98bfc0869", kill_on_drop: false }`
[INFO] [stdout] b8c5d724d60f0d7493254cbf5f79724ad5f7f2a090d18b5407908db98bfc0869
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0b22900af32316051f38f29b0d708d147b9b30ca15871477209dba38d2f689e9
[INFO] running `Command { std: "docker" "start" "-a" "0b22900af32316051f38f29b0d708d147b9b30ca15871477209dba38d2f689e9", kill_on_drop: false }`
[INFO] [stderr]     Checking futures-sink v0.3.30
[INFO] [stderr]     Checking futures-core v0.3.30
[INFO] [stderr]     Checking async-task v4.7.1
[INFO] [stderr]    Compiling syn v2.0.76
[INFO] [stderr]     Checking futures-channel v0.3.30
[INFO] [stderr]     Checking schedwalk v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling futures-macro v0.3.30
[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stderr]     Checking futures-executor v0.3.30
[INFO] [stderr]     Checking futures v0.3.30
[INFO] [stdout] warning: calls to `std::mem::drop` with a value that implements `Copy` does nothing
[INFO] [stdout]    --> src/lib.rs:333:17
[INFO] [stdout]     |
[INFO] [stdout] 333 |                 drop(sender_a.send(()));
[INFO] [stdout]     |                 ^^^^^-----------------^
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      argument has type `Result<(), ()>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_copy_types)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 333 -                 drop(sender_a.send(()));
[INFO] [stdout] 333 +                 let _ = sender_a.send(());
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a value that implements `Copy` does nothing
[INFO] [stdout]    --> src/lib.rs:337:17
[INFO] [stdout]     |
[INFO] [stdout] 337 |                 drop(sender_b.send(()));
[INFO] [stdout]     |                 ^^^^^-----------------^
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      argument has type `Result<(), ()>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 337 -                 drop(sender_b.send(()));
[INFO] [stdout] 337 +                 let _ = sender_b.send(());
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.98s
[INFO] running `Command { std: "docker" "inspect" "0b22900af32316051f38f29b0d708d147b9b30ca15871477209dba38d2f689e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0b22900af32316051f38f29b0d708d147b9b30ca15871477209dba38d2f689e9", kill_on_drop: false }`
[INFO] [stdout] 0b22900af32316051f38f29b0d708d147b9b30ca15871477209dba38d2f689e9