[INFO] fetching crate struct_field_names 0.2.1...
[INFO] testing struct_field_names-0.2.1 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate struct_field_names 0.2.1 into /workspace/builds/worker-77/source
[INFO] validating manifest of crates.io crate struct_field_names 0.2.1 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 struct_field_names 0.2.1
[INFO] finished tweaking crates.io crate struct_field_names 0.2.1
[INFO] tweaked toml for crates.io crate struct_field_names 0.2.1 written to /workspace/builds/worker-77/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/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] 471284a87afb034804b7fa952e1e60ff973cf098c49b7ff02ba86271573b84cf
[INFO] running `Command { std: "docker" "start" "-a" "471284a87afb034804b7fa952e1e60ff973cf098c49b7ff02ba86271573b84cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "471284a87afb034804b7fa952e1e60ff973cf098c49b7ff02ba86271573b84cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "471284a87afb034804b7fa952e1e60ff973cf098c49b7ff02ba86271573b84cf", kill_on_drop: false }`
[INFO] [stdout] 471284a87afb034804b7fa952e1e60ff973cf098c49b7ff02ba86271573b84cf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/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] [stdout] c0d2d6055bf74bac662fe4f8bca5ba77a30bf1a178328a35b8598ab4f0b5b864
[INFO] running `Command { std: "docker" "start" "-a" "c0d2d6055bf74bac662fe4f8bca5ba77a30bf1a178328a35b8598ab4f0b5b864", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.76
[INFO] [stderr]    Compiling struct_field_names v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.41s
[INFO] running `Command { std: "docker" "inspect" "c0d2d6055bf74bac662fe4f8bca5ba77a30bf1a178328a35b8598ab4f0b5b864", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c0d2d6055bf74bac662fe4f8bca5ba77a30bf1a178328a35b8598ab4f0b5b864", kill_on_drop: false }`
[INFO] [stdout] c0d2d6055bf74bac662fe4f8bca5ba77a30bf1a178328a35b8598ab4f0b5b864
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/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] [stdout] f3e765903d963cafcdd6b3afa323e2447bad101e71f37eeb3a5ebbddf292c9e4
[INFO] running `Command { std: "docker" "start" "-a" "f3e765903d963cafcdd6b3afa323e2447bad101e71f37eeb3a5ebbddf292c9e4", kill_on_drop: false }`
[INFO] [stderr]    Compiling struct_field_names v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.86s
[INFO] running `Command { std: "docker" "inspect" "f3e765903d963cafcdd6b3afa323e2447bad101e71f37eeb3a5ebbddf292c9e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f3e765903d963cafcdd6b3afa323e2447bad101e71f37eeb3a5ebbddf292c9e4", kill_on_drop: false }`
[INFO] [stdout] f3e765903d963cafcdd6b3afa323e2447bad101e71f37eeb3a5ebbddf292c9e4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/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] [stdout] fd13e65fab903503a5e0746b85a9e764b75854c78a3b76396837348d600f31fd
[INFO] running `Command { std: "docker" "start" "-a" "fd13e65fab903503a5e0746b85a9e764b75854c78a3b76396837348d600f31fd", kill_on_drop: false }`
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/struct_field_names-8481fadd1528c892)
[INFO] [stdout] 
[INFO] [stderr]      Running tests/tests.rs (/opt/rustwide/target/debug/deps/tests-2bf4551415b4e93f)
[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] [stdout] 
[INFO] [stdout] running 5 tests
[INFO] [stdout] test not_a_test_field_visibility ... ok
[INFO] [stdout] test not_a_test_skip_attribute ... ok
[INFO] [stdout] test test_field_names ... ok
[INFO] [stdout] test test_variant_names ... ok
[INFO] [stdout] test test_with_generic_struct ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests struct_field_names
[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" "fd13e65fab903503a5e0746b85a9e764b75854c78a3b76396837348d600f31fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd13e65fab903503a5e0746b85a9e764b75854c78a3b76396837348d600f31fd", kill_on_drop: false }`
[INFO] [stdout] fd13e65fab903503a5e0746b85a9e764b75854c78a3b76396837348d600f31fd