[INFO] fetching crate xtra 0.5.0-rc.1...
[INFO] checking xtra-0.5.0-rc.1 against try#9cfe725f0995b018340c519db1b2f3cf8a7e0631 for pr-81174
[INFO] extracting crate xtra 0.5.0-rc.1 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate xtra 0.5.0-rc.1 on toolchain 9cfe725f0995b018340c519db1b2f3cf8a7e0631
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9cfe725f0995b018340c519db1b2f3cf8a7e0631" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate xtra 0.5.0-rc.1
[INFO] removed 0 missing examples
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate xtra 0.5.0-rc.1
[INFO] tweaked toml for crates.io crate xtra 0.5.0-rc.1 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate crates.io crate xtra 0.5.0-rc.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9cfe725f0995b018340c519db1b2f3cf8a7e0631" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded futures-core v0.3.8
[INFO] [stderr]   Downloaded async-trait v0.1.41
[INFO] [stderr]   Downloaded spin v0.7.0
[INFO] [stderr]   Downloaded lock_api v0.4.1
[INFO] [stderr]   Downloaded futures-macro v0.3.8
[INFO] [stderr]   Downloaded libc v0.2.80
[INFO] [stderr]   Downloaded proc-macro-nested v0.1.6
[INFO] [stderr]   Downloaded spinny v0.2.1
[INFO] [stderr]   Downloaded pin-project-lite v0.1.11
[INFO] [stderr]   Downloaded async-global-executor v1.4.3
[INFO] [stderr]   Downloaded futures-channel v0.3.8
[INFO] [stderr]   Downloaded hermit-abi v0.1.17
[INFO] [stderr]   Downloaded wasm-bindgen-futures v0.4.18
[INFO] [stderr]   Downloaded smol v1.2.4
[INFO] [stderr]   Downloaded async-std v1.8.0
[INFO] [stderr]   Downloaded signal-hook-registry v1.2.2
[INFO] [stderr]   Downloaded smol-potat v1.1.0
[INFO] [stderr]   Downloaded futures-util v0.3.8
[INFO] [stderr]   Downloaded tokio v1.0.1
[INFO] [stderr]   Downloaded async-io v1.2.0
[INFO] [stderr]   Downloaded smol-potat-macro v0.5.0
[INFO] [stderr]   Downloaded futures-lite v1.11.2
[INFO] [stderr]   Downloaded async-fs v1.5.0
[INFO] [stderr]   Downloaded async-net v1.5.0
[INFO] [stderr]   Downloaded pollster v0.2.0
[INFO] [stderr]   Downloaded signal-hook v0.1.16
[INFO] [stderr]   Downloaded instant v0.1.8
[INFO] [stderr]   Downloaded futures-io v0.3.8
[INFO] [stderr]   Downloaded cc v1.0.62
[INFO] [stderr]   Downloaded pin-project-lite v0.2.0
[INFO] [stderr]   Downloaded pin-project v1.0.1
[INFO] [stderr]   Downloaded getrandom v0.2.1
[INFO] [stderr]   Downloaded futures-task v0.3.8
[INFO] [stderr]   Downloaded futures-sink v0.3.8
[INFO] [stderr]   Downloaded pin-project-internal v1.0.1
[INFO] [stderr]   Downloaded rand v0.8.1
[INFO] [stderr]   Downloaded syn v1.0.48
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+9cfe725f0995b018340c519db1b2f3cf8a7e0631" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c99d6524b5002d5b528c8b456393bdbe60c0508cc705815a592ea2b54d1f7d60
[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" "c99d6524b5002d5b528c8b456393bdbe60c0508cc705815a592ea2b54d1f7d60", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c99d6524b5002d5b528c8b456393bdbe60c0508cc705815a592ea2b54d1f7d60", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c99d6524b5002d5b528c8b456393bdbe60c0508cc705815a592ea2b54d1f7d60", kill_on_drop: false }`
[INFO] [stdout] c99d6524b5002d5b528c8b456393bdbe60c0508cc705815a592ea2b54d1f7d60
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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=forbid" "-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@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+9cfe725f0995b018340c519db1b2f3cf8a7e0631" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 280fca65a582d68a038b79024c72641da0375d92ebf467f24df6a34f8f9b6fd6
[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" "280fca65a582d68a038b79024c72641da0375d92ebf467f24df6a34f8f9b6fd6", kill_on_drop: false }`
[INFO] [stderr]     Checking futures-core v0.3.8
[INFO] [stderr]     Checking cache-padded v1.1.1
[INFO] [stderr]     Checking once_cell v1.5.2
[INFO] [stderr]    Compiling syn v1.0.48
[INFO] [stderr]     Checking parking v2.0.0
[INFO] [stderr]     Checking event-listener v2.5.1
[INFO] [stderr]     Checking futures-io v0.3.8
[INFO] [stderr]     Checking fastrand v1.4.0
[INFO] [stderr]     Checking waker-fn v1.1.0
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking vec-arena v1.0.0
[INFO] [stderr]     Checking async-task v4.0.3
[INFO] [stderr]    Compiling proc-macro-nested v0.1.6
[INFO] [stderr]     Checking atomic-waker v1.0.0
[INFO] [stderr]     Checking futures-sink v0.3.8
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking spin v0.7.0
[INFO] [stderr]     Checking futures-timer v3.0.2
[INFO] [stderr]     Checking pollster v0.2.0
[INFO] [stderr]     Checking lock_api v0.4.1
[INFO] [stderr]     Checking concurrent-queue v1.2.2
[INFO] [stderr]     Checking nb-connect v1.0.2
[INFO] [stderr]     Checking getrandom v0.2.1
[INFO] [stderr]     Checking signal-hook-registry v1.2.2
[INFO] [stderr]     Checking async-lock v2.3.0
[INFO] [stderr]     Checking futures-task v0.3.8
[INFO] [stderr]     Checking futures-lite v1.11.2
[INFO] [stderr]     Checking catty v0.1.4
[INFO] [stderr]     Checking rand_core v0.6.1
[INFO] [stderr]     Checking signal-hook v0.1.16
[INFO] [stderr]     Checking spinny v0.2.1
[INFO] [stderr]     Checking spinning_top v0.2.2
[INFO] [stderr]     Checking async-channel v1.5.1
[INFO] [stderr]     Checking barrage v0.2.1
[INFO] [stderr]     Checking polling v2.0.2
[INFO] [stderr]     Checking rand_chacha v0.3.0
[INFO] [stderr]     Checking rand v0.8.1
[INFO] [stderr]     Checking async-io v1.2.0
[INFO] [stderr]     Checking blocking v1.0.2
[INFO] [stderr]     Checking async-executor v1.4.0
[INFO] [stderr]     Checking async-fs v1.5.0
[INFO] [stderr]     Checking async-net v1.5.0
[INFO] [stderr]     Checking async-process v1.0.1
[INFO] [stderr]     Checking smol v1.2.4
[INFO] [stderr]    Compiling pin-project-internal v1.0.1
[INFO] [stderr]    Compiling futures-macro v0.3.8
[INFO] [stderr]    Compiling async-trait v0.1.41
[INFO] [stderr]    Compiling smol-potat-macro v0.5.0
[INFO] [stderr]     Checking smol-potat v1.1.0
[INFO] [stderr]     Checking pin-project v1.0.1
[INFO] [stderr]     Checking flume v0.10.1
[INFO] [stderr]     Checking futures-util v0.3.8
[INFO] [stderr]     Checking xtra v0.5.0-rc.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 47.32s
[INFO] running `Command { std: "docker" "inspect" "280fca65a582d68a038b79024c72641da0375d92ebf467f24df6a34f8f9b6fd6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "280fca65a582d68a038b79024c72641da0375d92ebf467f24df6a34f8f9b6fd6", kill_on_drop: false }`
[INFO] [stdout] 280fca65a582d68a038b79024c72641da0375d92ebf467f24df6a34f8f9b6fd6