[INFO] fetching crate uexec 0.1.4...
[INFO] checking uexec-0.1.4 against try#24cd45d7714ba43afd4b8e62fb677b069b21c4a5 for pr-129543
[INFO] extracting crate uexec 0.1.4 into /workspace/builds/worker-7-tc2/source
[INFO] validating manifest of crates.io crate uexec 0.1.4 on toolchain 24cd45d7714ba43afd4b8e62fb677b069b21c4a5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+24cd45d7714ba43afd4b8e62fb677b069b21c4a5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate uexec 0.1.4
[INFO] finished tweaking crates.io crate uexec 0.1.4
[INFO] tweaked toml for crates.io crate uexec 0.1.4 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate crates.io crate uexec 0.1.4 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" "+24cd45d7714ba43afd4b8e62fb677b069b21c4a5" "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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+24cd45d7714ba43afd4b8e62fb677b069b21c4a5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3331171072d7d7ec4b142b8a1d22822b701a027062bf5ad46bb59ef4a19133b5
[INFO] running `Command { std: "docker" "start" "-a" "3331171072d7d7ec4b142b8a1d22822b701a027062bf5ad46bb59ef4a19133b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3331171072d7d7ec4b142b8a1d22822b701a027062bf5ad46bb59ef4a19133b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3331171072d7d7ec4b142b8a1d22822b701a027062bf5ad46bb59ef4a19133b5", kill_on_drop: false }`
[INFO] [stdout] 3331171072d7d7ec4b142b8a1d22822b701a027062bf5ad46bb59ef4a19133b5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+24cd45d7714ba43afd4b8e62fb677b069b21c4a5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3526f4933d7a482384ed5b2aa9806193b09627254ee85477c61a67c30fc11c7a
[INFO] running `Command { std: "docker" "start" "-a" "3526f4933d7a482384ed5b2aa9806193b09627254ee85477c61a67c30fc11c7a", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.94
[INFO] [stderr]    Compiling proc-macro2 v1.0.26
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]    Compiling getrandom v0.2.2
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]     Checking instant v0.1.9
[INFO] [stderr]     Checking smallvec v1.6.1
[INFO] [stderr]     Checking futures-core v0.3.14
[INFO] [stderr]     Checking lock_api v0.4.4
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking futures-sink v0.3.14
[INFO] [stderr]    Compiling doc-comment v0.3.3
[INFO] [stderr]     Checking fastrand v1.4.1
[INFO] [stderr]     Checking spinning_top v0.2.3
[INFO] [stderr]     Checking futures-io v0.3.14
[INFO] [stderr]     Checking pin-project-lite v0.2.6
[INFO] [stderr]     Checking parking v2.0.0
[INFO] [stderr]    Compiling crossbeam-utils v0.8.4
[INFO] [stderr]     Checking waker-fn v1.1.0
[INFO] [stderr]     Checking once_cell v1.7.2
[INFO] [stderr]     Checking easy-parallel v3.1.0
[INFO] [stderr]     Checking futures-lite v1.11.3
[INFO] [stderr]     Checking parking_lot_core v0.8.3
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking nanorand v0.5.2
[INFO] [stderr]     Checking parking_lot v0.11.1
[INFO] [stderr]    Compiling pin-project-internal v1.0.7
[INFO] [stderr]     Checking pin-project v1.0.7
[INFO] [stderr]     Checking flume v0.10.5
[INFO] [stderr]     Checking uexec v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: calls to `std::mem::drop` with a value that implements `Copy` does nothing
[INFO] [stdout]   --> examples/channel.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |             drop(sender.send_async(Some(i)).await);
[INFO] [stdout]    |             ^^^^^--------------------------------^
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  argument has type `Result<(), flume::SendError<Option<u8>>>`
[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] 20 -             drop(sender.send_async(Some(i)).await);
[INFO] [stdout] 20 +             let _ = sender.send_async(Some(i)).await;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a value that implements `Copy` does nothing
[INFO] [stdout]   --> examples/channel.rs:23:17
[INFO] [stdout]    |
[INFO] [stdout] 23 |                 drop(sender.send_async(None).await);
[INFO] [stdout]    |                 ^^^^^-----------------------------^
[INFO] [stdout]    |                      |
[INFO] [stdout]    |                      argument has type `Result<(), flume::SendError<Option<u8>>>`
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    |
[INFO] [stdout] 23 -                 drop(sender.send_async(None).await);
[INFO] [stdout] 23 +                 let _ = sender.send_async(None).await;
[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 14.00s
[INFO] running `Command { std: "docker" "inspect" "3526f4933d7a482384ed5b2aa9806193b09627254ee85477c61a67c30fc11c7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3526f4933d7a482384ed5b2aa9806193b09627254ee85477c61a67c30fc11c7a", kill_on_drop: false }`
[INFO] [stdout] 3526f4933d7a482384ed5b2aa9806193b09627254ee85477c61a67c30fc11c7a