[INFO] fetching crate singleton 0.2.2...
[INFO] testing singleton-0.2.2 against 1.49.0 for beta-1.50-1
[INFO] extracting crate singleton 0.2.2 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate singleton 0.2.2 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate singleton 0.2.2
[INFO] finished tweaking crates.io crate singleton 0.2.2
[INFO] tweaked toml for crates.io crate singleton 0.2.2 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "+1.49.0" "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] d7adbbb8d6be0c95936502c361544abdf033117d45ed773960aa4832b815c29a
[INFO] running `Command { std: "docker" "start" "-a" "d7adbbb8d6be0c95936502c361544abdf033117d45ed773960aa4832b815c29a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d7adbbb8d6be0c95936502c361544abdf033117d45ed773960aa4832b815c29a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d7adbbb8d6be0c95936502c361544abdf033117d45ed773960aa4832b815c29a", kill_on_drop: false }`
[INFO] [stdout] d7adbbb8d6be0c95936502c361544abdf033117d45ed773960aa4832b815c29a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "+1.49.0" "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] 2d465a6f5a3bbbd4276fc047c57e0b98816045e14bbbd0523b514865d32905a5
[INFO] running `Command { std: "docker" "start" "-a" "2d465a6f5a3bbbd4276fc047c57e0b98816045e14bbbd0523b514865d32905a5", kill_on_drop: false }`
[INFO] [stderr]    Compiling singleton v0.2.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.48s
[INFO] running `Command { std: "docker" "inspect" "2d465a6f5a3bbbd4276fc047c57e0b98816045e14bbbd0523b514865d32905a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2d465a6f5a3bbbd4276fc047c57e0b98816045e14bbbd0523b514865d32905a5", kill_on_drop: false }`
[INFO] [stdout] 2d465a6f5a3bbbd4276fc047c57e0b98816045e14bbbd0523b514865d32905a5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "+1.49.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6b367316659935f6d9ecf238f637392fe7957533882181a6a15f4bb6474baef8
[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" "6b367316659935f6d9ecf238f637392fe7957533882181a6a15f4bb6474baef8", kill_on_drop: false }`
[INFO] [stderr]    Compiling singleton v0.2.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.05s
[INFO] running `Command { std: "docker" "inspect" "6b367316659935f6d9ecf238f637392fe7957533882181a6a15f4bb6474baef8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b367316659935f6d9ecf238f637392fe7957533882181a6a15f4bb6474baef8", kill_on_drop: false }`
[INFO] [stdout] 6b367316659935f6d9ecf238f637392fe7957533882181a6a15f4bb6474baef8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "+1.49.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 330530b1c3ddeedc114dec9db3c9653bc13c4b4f1004607d39b1454aa7cd703b
[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" "330530b1c3ddeedc114dec9db3c9653bc13c4b4f1004607d39b1454aa7cd703b", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stdout] running 1 test
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/singleton-680dba3a734c8aba
[INFO] [stdout] test singleton::tests::it_works ... ok
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/trial-91c57440642010ba
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests singleton
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[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
[INFO] [stdout] 
[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
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "330530b1c3ddeedc114dec9db3c9653bc13c4b4f1004607d39b1454aa7cd703b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "330530b1c3ddeedc114dec9db3c9653bc13c4b4f1004607d39b1454aa7cd703b", kill_on_drop: false }`
[INFO] [stdout] 330530b1c3ddeedc114dec9db3c9653bc13c4b4f1004607d39b1454aa7cd703b