[INFO] fetching crate task-group 0.2.2...
[INFO] checking task-group-0.2.2 against try#998b6603a58e47f42ccce7a67943234e96b6839e for pr-143170
[INFO] extracting crate task-group 0.2.2 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate task-group 0.2.2
[INFO] finished tweaking crates.io crate task-group 0.2.2
[INFO] tweaked toml for crates.io crate task-group 0.2.2 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate task-group 0.2.2 on toolchain 998b6603a58e47f42ccce7a67943234e96b6839e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate task-group 0.2.2 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" "+998b6603a58e47f42ccce7a67943234e96b6839e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] aeb865fc4fd8c0d7032e46a4c9fa4f687909468db25aa746fc3ec366f3ec0ec0
[INFO] running `Command { std: "docker" "start" "-a" "aeb865fc4fd8c0d7032e46a4c9fa4f687909468db25aa746fc3ec366f3ec0ec0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aeb865fc4fd8c0d7032e46a4c9fa4f687909468db25aa746fc3ec366f3ec0ec0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aeb865fc4fd8c0d7032e46a4c9fa4f687909468db25aa746fc3ec366f3ec0ec0", kill_on_drop: false }`
[INFO] [stdout] aeb865fc4fd8c0d7032e46a4c9fa4f687909468db25aa746fc3ec366f3ec0ec0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b4bd57e9a8ea7ec4bd01deac032ad1bcc4990b9c29149bf0f122b8e0b95cdaec
[INFO] running `Command { std: "docker" "start" "-a" "b4bd57e9a8ea7ec4bd01deac032ad1bcc4990b9c29149bf0f122b8e0b95cdaec", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.91
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling syn v1.0.67
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]     Checking smallvec v1.6.1
[INFO] [stderr]     Checking instant v0.1.9
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]     Checking lock_api v0.4.2
[INFO] [stderr]     Checking pin-project-lite v0.2.6
[INFO] [stderr]    Compiling anyhow v1.0.40
[INFO] [stderr]     Checking bytes v1.0.1
[INFO] [stderr]    Compiling tokio v1.4.0
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking parking_lot_core v0.8.3
[INFO] [stderr]     Checking mio v0.7.11
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking signal-hook-registry v1.3.0
[INFO] [stderr]     Checking parking_lot v0.11.1
[INFO] [stderr]    Compiling tokio-macros v1.1.0
[INFO] [stderr]     Checking task-group v0.2.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: calls to `std::mem::drop` with a value that implements `Copy` does nothing
[INFO] [stdout]    --> src/lib.rs:566:13
[INFO] [stdout]     |
[INFO] [stdout] 566 |             drop(big_object);
[INFO] [stdout]     |             ^^^^^----------^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  argument has type `[u8; 4096]`
[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] 566 -             drop(big_object);
[INFO] [stdout] 566 +             let _ = big_object;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 12.95s
[INFO] running `Command { std: "docker" "inspect" "b4bd57e9a8ea7ec4bd01deac032ad1bcc4990b9c29149bf0f122b8e0b95cdaec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b4bd57e9a8ea7ec4bd01deac032ad1bcc4990b9c29149bf0f122b8e0b95cdaec", kill_on_drop: false }`
[INFO] [stdout] b4bd57e9a8ea7ec4bd01deac032ad1bcc4990b9c29149bf0f122b8e0b95cdaec