[INFO] fetching crate task-group 0.2.2...
[INFO] testing task-group-0.2.2 against 1.91.0 for beta-1.92-2
[INFO] extracting crate task-group 0.2.2 into /workspace/builds/worker-4-tc1/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-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate task-group 0.2.2 on toolchain 1.91.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "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" "+1.91.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded proc-macro2 v1.0.24
[INFO] [stderr]   Downloaded tokio-macros v1.1.0
[INFO] [stderr]   Downloaded instant v0.1.9
[INFO] [stderr]   Downloaded quote v1.0.9
[INFO] [stderr]   Downloaded unicode-xid v0.2.1
[INFO] [stderr]   Downloaded cfg-if v1.0.0
[INFO] [stderr]   Downloaded hermit-abi v0.1.18
[INFO] [stderr]   Downloaded num_cpus v1.13.0
[INFO] [stderr]   Downloaded anyhow v1.0.40
[INFO] [stderr]   Downloaded bytes v1.0.1
[INFO] [stderr]   Downloaded log v0.4.14
[INFO] [stderr]   Downloaded mio v0.7.11
[INFO] [stderr]   Downloaded once_cell v1.7.2
[INFO] [stderr]   Downloaded smallvec v1.6.1
[INFO] [stderr]   Downloaded parking_lot v0.11.1
[INFO] [stderr]   Downloaded ntapi v0.3.6
[INFO] [stderr]   Downloaded pin-project-lite v0.2.6
[INFO] [stderr]   Downloaded signal-hook-registry v1.3.0
[INFO] [stderr]   Downloaded autocfg v1.0.1
[INFO] [stderr]   Downloaded memchr v2.3.4
[INFO] [stderr]   Downloaded syn v1.0.67
[INFO] [stderr]   Downloaded miow v0.3.7
[INFO] [stderr]   Downloaded scopeguard v1.1.0
[INFO] [stderr]   Downloaded lock_api v0.4.2
[INFO] [stderr]   Downloaded bitflags v1.2.1
[INFO] [stderr]   Downloaded parking_lot_core v0.8.3
[INFO] [stderr]   Downloaded redox_syscall v0.2.5
[INFO] [stderr]   Downloaded tokio v1.4.0
[INFO] [stderr]   Downloaded libc v0.2.91
[INFO] [stderr]   Downloaded winapi v0.3.9
[INFO] [stderr]   Downloaded winapi-i686-pc-windows-gnu v0.4.0
[INFO] [stderr]   Downloaded winapi-x86_64-pc-windows-gnu v0.4.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 294570ed3f6a7928b00c75daff58d2efede24b25547111a0ac0b02933427f125
[INFO] running `Command { std: "docker" "start" "-a" "294570ed3f6a7928b00c75daff58d2efede24b25547111a0ac0b02933427f125", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "294570ed3f6a7928b00c75daff58d2efede24b25547111a0ac0b02933427f125", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "294570ed3f6a7928b00c75daff58d2efede24b25547111a0ac0b02933427f125", kill_on_drop: false }`
[INFO] [stdout] 294570ed3f6a7928b00c75daff58d2efede24b25547111a0ac0b02933427f125
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2098546b6284385c39137e8f3bd1a4d89978505f4e7df04c622d6b71e10f53d5
[INFO] running `Command { std: "docker" "start" "-a" "2098546b6284385c39137e8f3bd1a4d89978505f4e7df04c622d6b71e10f53d5", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.91
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.67
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling smallvec v1.6.1
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling instant v0.1.9
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling lock_api v0.4.2
[INFO] [stderr]    Compiling pin-project-lite v0.2.6
[INFO] [stderr]    Compiling once_cell v1.7.2
[INFO] [stderr]    Compiling bytes v1.0.1
[INFO] [stderr]    Compiling tokio v1.4.0
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling parking_lot_core v0.8.3
[INFO] [stderr]    Compiling mio v0.7.11
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling signal-hook-registry v1.3.0
[INFO] [stderr]    Compiling parking_lot v0.11.1
[INFO] [stderr]    Compiling tokio-macros v1.1.0
[INFO] [stderr]    Compiling task-group v0.2.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.67s
[INFO] running `Command { std: "docker" "inspect" "2098546b6284385c39137e8f3bd1a4d89978505f4e7df04c622d6b71e10f53d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2098546b6284385c39137e8f3bd1a4d89978505f4e7df04c622d6b71e10f53d5", kill_on_drop: false }`
[INFO] [stdout] 2098546b6284385c39137e8f3bd1a4d89978505f4e7df04c622d6b71e10f53d5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 20405a0d0ab74b1839c4961e7e49f97d3d07ddf3c1080fd2a1f26329419dd7e4
[INFO] running `Command { std: "docker" "start" "-a" "20405a0d0ab74b1839c4961e7e49f97d3d07ddf3c1080fd2a1f26329419dd7e4", kill_on_drop: false }`
[INFO] [stderr]    Compiling anyhow v1.0.40
[INFO] [stderr]    Compiling 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 `test` profile [unoptimized + debuginfo] target(s) in 3.65s
[INFO] running `Command { std: "docker" "inspect" "20405a0d0ab74b1839c4961e7e49f97d3d07ddf3c1080fd2a1f26329419dd7e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "20405a0d0ab74b1839c4961e7e49f97d3d07ddf3c1080fd2a1f26329419dd7e4", kill_on_drop: false }`
[INFO] [stdout] 20405a0d0ab74b1839c4961e7e49f97d3d07ddf3c1080fd2a1f26329419dd7e4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 91dd585de2c0153347dcfc200930f26650b90a40f2291af76d62d0302753ebdd
[INFO] running `Command { std: "docker" "start" "-a" "91dd585de2c0153347dcfc200930f26650b90a40f2291af76d62d0302753ebdd", kill_on_drop: false }`
[INFO] [stderr] warning: calls to `std::mem::drop` with a value that implements `Copy` does nothing
[INFO] [stderr]    --> src/lib.rs:566:13
[INFO] [stderr]     |
[INFO] [stderr] 566 |             drop(big_object);
[INFO] [stderr]     |             ^^^^^----------^
[INFO] [stderr]     |                  |
[INFO] [stderr]     |                  argument has type `[u8; 4096]`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dropping_copy_types)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the expression or result
[INFO] [stderr]     |
[INFO] [stderr] 566 -             drop(big_object);
[INFO] [stderr] 566 +             let _ = big_object;
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: `task-group` (lib test) generated 1 warning
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.11s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/task_group-12f999ac4be203fd)
[INFO] [stdout] 
[INFO] [stdout] running 12 tests
[INFO] [stdout] test test::no_task ... ok
[INFO] [stdout] test test::child_task_errors ... ok
[INFO] [stdout] test test::many_nested_children ... ok
[INFO] [stdout] test test::one_empty_task ... ok
[INFO] [stdout] test test::many_nested_children_error ... ok
[INFO] [stdout] test test::sizes_of_futures ... ok
[INFO] [stdout] test test::empty_child ... ok
[INFO] [stdout] test test::root_task_errors ... ok
[INFO] [stdout] test test::root_task_panics ... ok
[INFO] [stdout] test test::child_task_panics ... ok
[INFO] [stdout] test test::child_sleep_no_timeout ... ok
[INFO] [stdout] test test::child_sleep_timeout ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 12 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 1.01s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests task_group
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "91dd585de2c0153347dcfc200930f26650b90a40f2291af76d62d0302753ebdd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "91dd585de2c0153347dcfc200930f26650b90a40f2291af76d62d0302753ebdd", kill_on_drop: false }`
[INFO] [stdout] 91dd585de2c0153347dcfc200930f26650b90a40f2291af76d62d0302753ebdd