[INFO] fetching crate grabbag 0.1.2...
[INFO] testing grabbag-0.1.2 against beta-2021-01-01 for beta-1.50-1
[INFO] extracting crate grabbag 0.1.2 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate grabbag 0.1.2 on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate grabbag 0.1.2
[INFO] removed path dependency grabbag_macros from crates.io crate grabbag 0.1.2
[INFO] finished tweaking crates.io crate grabbag 0.1.2
[INFO] tweaked toml for crates.io crate grabbag 0.1.2 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded grabbag_macros v0.1.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 721713f99a165ded2371d076680808dc33bd5a1159569745a2570e28f5308962
[INFO] running `Command { std: "docker" "start" "-a" "721713f99a165ded2371d076680808dc33bd5a1159569745a2570e28f5308962", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "721713f99a165ded2371d076680808dc33bd5a1159569745a2570e28f5308962", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "721713f99a165ded2371d076680808dc33bd5a1159569745a2570e28f5308962", kill_on_drop: false }`
[INFO] [stdout] 721713f99a165ded2371d076680808dc33bd5a1159569745a2570e28f5308962
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 94366ffdc791825c99b2577cdb0e81ee119a22c10bf10c426df5aae965702da1
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "94366ffdc791825c99b2577cdb0e81ee119a22c10bf10c426df5aae965702da1", kill_on_drop: false }`
[INFO] [stderr]    Compiling grabbag_macros v0.1.2
[INFO] [stderr]    Compiling grabbag v0.1.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.45s
[INFO] running `Command { std: "docker" "inspect" "94366ffdc791825c99b2577cdb0e81ee119a22c10bf10c426df5aae965702da1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "94366ffdc791825c99b2577cdb0e81ee119a22c10bf10c426df5aae965702da1", kill_on_drop: false }`
[INFO] [stdout] 94366ffdc791825c99b2577cdb0e81ee119a22c10bf10c426df5aae965702da1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 289ccd4b351202c1f93f94d824e4c9876fea3f85e7ea2e4fde352f569577aec0
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "289ccd4b351202c1f93f94d824e4c9876fea3f85e7ea2e4fde352f569577aec0", kill_on_drop: false }`
[INFO] [stderr]    Compiling grabbag v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused return value of `collect` that must be used
[INFO] [stdout]   --> src/iter/skip_exactly.rs:57:37
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let r = thread::spawn(move || { v.into_iter().skip_exactly(3).collect::<Vec<_>>(); }).join();
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `collect` that must be used
[INFO] [stdout]   --> src/iter/take_exactly.rs:90:37
[INFO] [stdout]    |
[INFO] [stdout] 90 |     let r = thread::spawn(move || { v.into_iter().take_exactly(3).collect::<Vec<_>>(); }).join();
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.75s
[INFO] running `Command { std: "docker" "inspect" "289ccd4b351202c1f93f94d824e4c9876fea3f85e7ea2e4fde352f569577aec0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "289ccd4b351202c1f93f94d824e4c9876fea3f85e7ea2e4fde352f569577aec0", kill_on_drop: false }`
[INFO] [stdout] 289ccd4b351202c1f93f94d824e4c9876fea3f85e7ea2e4fde352f569577aec0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] f0c2f70972f50a677f86047af76795854554655f218210a1fea4c3ec5c1295d9
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "f0c2f70972f50a677f86047af76795854554655f218210a1fea4c3ec5c1295d9", kill_on_drop: false }`
[INFO] [stderr] warning: unused return value of `collect` that must be used
[INFO] [stderr]   --> src/iter/skip_exactly.rs:57:37
[INFO] [stderr]    |
[INFO] [stderr] 57 |     let r = thread::spawn(move || { v.into_iter().skip_exactly(3).collect::<Vec<_>>(); }).join();
[INFO] [stderr]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `collect` that must be used
[INFO] [stderr]   --> src/iter/take_exactly.rs:90:37
[INFO] [stderr]    |
[INFO] [stderr] 90 |     let r = thread::spawn(move || { v.into_iter().take_exactly(3).collect::<Vec<_>>(); }).join();
[INFO] [stderr]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/grabbag-f55724b9c2c51337
[INFO] [stdout] running 22 tests
[INFO] [stdout] test iter::accumulate::test_accumulate ... ok
[INFO] [stdout] test iter::accumulate::test_accumulate_unwrap ... ok
[INFO] [stdout] test iter::cartesian_product::test_cartesian_product ... ok
[INFO] [stdout] test iter::clone_each::test_clone_each ... ok
[INFO] [stdout] test iter::fold::test_foldl_map ... ok
[INFO] [stdout] test iter::group_by::test_group_by ... ok
[INFO] [stdout] test iter::intersperse::test_intersperse ... ok
[INFO] [stdout] test iter::fold::test_foldr ... ok
[INFO] [stdout] test iter::round_robin::test_round_robin_longest ... ok
[INFO] [stdout] test iter::keep_some::test_keep_some ... ok
[INFO] [stdout] test iter::fold::test_foldl ... ok
[INFO] [stdout] test iter::pad_tail_to::test_pad_tail_to ... ok
[INFO] [stdout] test iter::round_robin::test_round_robin ... ok
[INFO] [stdout] test iter::sorted::test_sorted_by ... ok
[INFO] [stdout] test iter::sorted::test_sorted ... ok
[INFO] [stdout] test iter::skip_exactly::test_skip ... ok
[INFO] [stdout] test iter::stride::test_stride ... ok
[INFO] [stdout] test iter::tee::test_tee ... ok
[INFO] [stdout] test iter::zip_longest::test_zip_longest ... ok
[INFO] [stdout] test iter::take_exactly::test_take ... ok
[INFO] [stdout] test iter::skip_exactly::test_skip_exactly ... ok
[INFO] [stdout] test iter::take_exactly::test_take_exactly ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 22 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.13s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests grabbag
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test src/iter/group_by.rs - iter::group_by::GroupByIterator::group_by (line 23) ... ok
[INFO] [stdout] test src/iter/accumulate.rs - iter::accumulate::AccumulateIterator::accumulate (line 34) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 1.09s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "f0c2f70972f50a677f86047af76795854554655f218210a1fea4c3ec5c1295d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f0c2f70972f50a677f86047af76795854554655f218210a1fea4c3ec5c1295d9", kill_on_drop: false }`
[INFO] [stdout] f0c2f70972f50a677f86047af76795854554655f218210a1fea4c3ec5c1295d9