[INFO] fetching crate gray_matter 0.2.0...
[INFO] testing gray_matter-0.2.0 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate gray_matter 0.2.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate gray_matter 0.2.0 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate gray_matter 0.2.0
[INFO] finished tweaking crates.io crate gray_matter 0.2.0
[INFO] tweaked toml for crates.io crate gray_matter 0.2.0 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8aceb5c5d1251e09740742abbc79cb317820e10a376374b94931657b432ff01e
[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" "8aceb5c5d1251e09740742abbc79cb317820e10a376374b94931657b432ff01e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8aceb5c5d1251e09740742abbc79cb317820e10a376374b94931657b432ff01e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8aceb5c5d1251e09740742abbc79cb317820e10a376374b94931657b432ff01e", kill_on_drop: false }`
[INFO] [stdout] 8aceb5c5d1251e09740742abbc79cb317820e10a376374b94931657b432ff01e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", 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] 79c50ad45e621e3fe8220b1addd1040e4ac00e3ca312905fcab05d4e4ff1ad93
[INFO] running `Command { std: "docker" "start" "-a" "79c50ad45e621e3fe8220b1addd1040e4ac00e3ca312905fcab05d4e4ff1ad93", kill_on_drop: false }`
[INFO] [stderr]    Compiling gray_matter v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/matter.rs:84:13
[INFO] [stdout]    |
[INFO] [stdout] 84 |             &line.to_string().push('\n');
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 84 |             let _ = &line.to_string().push('\n');
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.94s
[INFO] running `Command { std: "docker" "inspect" "79c50ad45e621e3fe8220b1addd1040e4ac00e3ca312905fcab05d4e4ff1ad93", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "79c50ad45e621e3fe8220b1addd1040e4ac00e3ca312905fcab05d4e4ff1ad93", kill_on_drop: false }`
[INFO] [stdout] 79c50ad45e621e3fe8220b1addd1040e4ac00e3ca312905fcab05d4e4ff1ad93
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen" "--no-run" "--message-format=json", 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] 5b48e0cae7229a721c1fdca7274ae35ddc693de9ef13188fa44aaf728d4978f3
[INFO] running `Command { std: "docker" "start" "-a" "5b48e0cae7229a721c1fdca7274ae35ddc693de9ef13188fa44aaf728d4978f3", kill_on_drop: false }`
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/matter.rs:84:13
[INFO] [stdout]    |
[INFO] [stdout] 84 |             &line.to_string().push('\n');
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 84 |             let _ = &line.to_string().push('\n');
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling gray_matter v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/matter.rs:84:13
[INFO] [stdout]    |
[INFO] [stdout] 84 |             &line.to_string().push('\n');
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 84 |             let _ = &line.to_string().push('\n');
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 3.18s
[INFO] running `Command { std: "docker" "inspect" "5b48e0cae7229a721c1fdca7274ae35ddc693de9ef13188fa44aaf728d4978f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5b48e0cae7229a721c1fdca7274ae35ddc693de9ef13188fa44aaf728d4978f3", kill_on_drop: false }`
[INFO] [stdout] 5b48e0cae7229a721c1fdca7274ae35ddc693de9ef13188fa44aaf728d4978f3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen", 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] d74340b1f19efaf7d457acb88e51a1e29823200e0e7c93b1cfb52dc8745f480b
[INFO] running `Command { std: "docker" "start" "-a" "d74340b1f19efaf7d457acb88e51a1e29823200e0e7c93b1cfb52dc8745f480b", kill_on_drop: false }`
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]   --> src/matter.rs:84:13
[INFO] [stderr]    |
[INFO] [stderr] 84 |             &line.to_string().push('\n');
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 84 |             let _ = &line.to_string().push('\n');
[INFO] [stderr]    |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `gray_matter` (lib) generated 1 warning
[INFO] [stderr] warning: `gray_matter` (lib test) generated 1 warning (1 duplicate)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/gray_matter-f41a3cc32128175b)
[INFO] [stdout] 
[INFO] [stdout] running 25 tests
[INFO] [stdout] test engine::json::test::test_matter ... ok
[INFO] [stdout] test engine::toml::test::test_matter ... ok
[INFO] [stdout] test tests::matter_read::test_all_matter ... ok
[INFO] [stdout] test tests::matter_read::test_basic ... ok
[INFO] [stdout] test engine::yaml::test::test_matter ... ok
[INFO] [stdout] test tests::matter_read::test_parse_empty ... ok
[INFO] [stdout] test matter::tests::test_parser ... ok
[INFO] [stdout] test matter::tests::test_empty_matter ... ok
[INFO] [stdout] test value::pod::test_len_of_pod ... ok
[INFO] [stdout] test value::pod::test_partial_compare_boolean ... ok
[INFO] [stdout] test value::pod::test_partial_compare_array ... ok
[INFO] [stdout] test value::pod::test_partial_compare_float ... ok
[INFO] [stdout] test value::pod::test_partial_compare_string ... ok
[INFO] [stdout] test value::pod::test_pod_from_into ... ok
[INFO] [stdout] test matter::tests::test_matter_excerpt ... ok
[INFO] [stdout] test value::pod::test_partial_compare_null ... ok
[INFO] [stdout] test matter::tests::test_int_vs_float ... ok
[INFO] [stdout] test value::pod::test_partial_compare_hash ... ok
[INFO] [stdout] test value::pod::test_index_str ... ok
[INFO] [stdout] test tests::matter_read::test_parse_no_matter ... ok
[INFO] [stdout] test value::pod::test_index_usize ... ok
[INFO] [stdout] test value::pod::test_partial_compare_integer ... ok
[INFO] [stdout] test matter::tests::test_front_matter ... ok
[INFO] [stdout] test value::pod::test_pod_deserialize ... ok
[INFO] [stdout] test tests::matter_read::test_parse_complex_yaml_front_matter ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 25 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests gray_matter
[INFO] [stdout] 
[INFO] [stdout] running 8 tests
[INFO] [stdout] test src/lib.rs - (line 24) ... ignored
[INFO] [stdout] test src/entity.rs - entity::ParsedEntityStruct (line 47) ... ok
[INFO] [stdout] test src/matter.rs - matter::Matter<T>::parse (line 36) ... ok
[INFO] [stdout] test src/entity.rs - entity::ParsedEntity (line 9) ... ok
[INFO] [stdout] test src/lib.rs - (line 135) ... ok
[INFO] [stdout] test src/lib.rs - (line 188) ... ok
[INFO] [stdout] test src/matter.rs - matter::Matter<T>::parse_with_struct (line 143) ... ok
[INFO] [stdout] test src/lib.rs - (line 50) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 7 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out; finished in 2.42s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "d74340b1f19efaf7d457acb88e51a1e29823200e0e7c93b1cfb52dc8745f480b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d74340b1f19efaf7d457acb88e51a1e29823200e0e7c93b1cfb52dc8745f480b", kill_on_drop: false }`
[INFO] [stdout] d74340b1f19efaf7d457acb88e51a1e29823200e0e7c93b1cfb52dc8745f480b