[INFO] fetching crate doubly 1.1.3...
[INFO] testing doubly-1.1.3 against 1.55.0 for beta-1.56-1
[INFO] extracting crate doubly 1.1.3 into /workspace/builds/worker-88/source
[INFO] validating manifest of crates.io crate doubly 1.1.3 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate doubly 1.1.3
[INFO] finished tweaking crates.io crate doubly 1.1.3
[INFO] tweaked toml for crates.io crate doubly 1.1.3 written to /workspace/builds/worker-88/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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" "+1.55.0" "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-88/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-88/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" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6fb5dcedb06f7e8470b56705b4d5e71ffccd7d4f5e8efa7e17a7c1994be565c5
[INFO] running `Command { std: "docker" "start" "-a" "6fb5dcedb06f7e8470b56705b4d5e71ffccd7d4f5e8efa7e17a7c1994be565c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6fb5dcedb06f7e8470b56705b4d5e71ffccd7d4f5e8efa7e17a7c1994be565c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6fb5dcedb06f7e8470b56705b4d5e71ffccd7d4f5e8efa7e17a7c1994be565c5", kill_on_drop: false }`
[INFO] [stdout] 6fb5dcedb06f7e8470b56705b4d5e71ffccd7d4f5e8efa7e17a7c1994be565c5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-88/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-88/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" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a825f79a90effe272c263bdbd974d854979c240a1930f5623e47ed639a6aa7ec
[INFO] running `Command { std: "docker" "start" "-a" "a825f79a90effe272c263bdbd974d854979c240a1930f5623e47ed639a6aa7ec", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling doubly v1.1.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.93s
[INFO] running `Command { std: "docker" "inspect" "a825f79a90effe272c263bdbd974d854979c240a1930f5623e47ed639a6aa7ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a825f79a90effe272c263bdbd974d854979c240a1930f5623e47ed639a6aa7ec", kill_on_drop: false }`
[INFO] [stdout] a825f79a90effe272c263bdbd974d854979c240a1930f5623e47ed639a6aa7ec
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-88/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-88/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" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b14215d9ece7bf0f51349908651fca8263177ceb6aa20c554215e2fb57f99e77
[INFO] running `Command { std: "docker" "start" "-a" "b14215d9ece7bf0f51349908651fca8263177ceb6aa20c554215e2fb57f99e77", kill_on_drop: false }`
[INFO] [stderr]    Compiling doubly v1.1.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.53s
[INFO] running `Command { std: "docker" "inspect" "b14215d9ece7bf0f51349908651fca8263177ceb6aa20c554215e2fb57f99e77", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b14215d9ece7bf0f51349908651fca8263177ceb6aa20c554215e2fb57f99e77", kill_on_drop: false }`
[INFO] [stdout] b14215d9ece7bf0f51349908651fca8263177ceb6aa20c554215e2fb57f99e77
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-88/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-88/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" "+1.55.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 9ef114e4985a56d1272aa0cc2cd53684af570c3f697d881bcf0413e54a2a49c8
[INFO] running `Command { std: "docker" "start" "-a" "9ef114e4985a56d1272aa0cc2cd53684af570c3f697d881bcf0413e54a2a49c8", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/doubly-4254d598269724a7)
[INFO] [stdout] 
[INFO] [stdout] running 5 tests
[INFO] [stdout] test tests::test_len ... ok
[INFO] [stdout] test tests::test_iter ... ok
[INFO] [stdout] test tests::test_append ... ok
[INFO] [stdout] test tests::test_list ... ok
[INFO] [stdout] test tests::test_empty ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests doubly
[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" "9ef114e4985a56d1272aa0cc2cd53684af570c3f697d881bcf0413e54a2a49c8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ef114e4985a56d1272aa0cc2cd53684af570c3f697d881bcf0413e54a2a49c8", kill_on_drop: false }`
[INFO] [stdout] 9ef114e4985a56d1272aa0cc2cd53684af570c3f697d881bcf0413e54a2a49c8