[INFO] fetching crate maybe-async 0.2.2...
[INFO] checking maybe-async-0.2.2 against try#9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c for pr-79472
[INFO] extracting crate maybe-async 0.2.2 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate maybe-async 0.2.2 on toolchain 9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate maybe-async 0.2.2
[INFO] finished tweaking crates.io crate maybe-async 0.2.2
[INFO] tweaked toml for crates.io crate maybe-async 0.2.2 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6ab3c5eb5ef1321c15f5cae6b5646406d79b43ad1c3f6abf043daef0bf7d23bb
[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" "6ab3c5eb5ef1321c15f5cae6b5646406d79b43ad1c3f6abf043daef0bf7d23bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6ab3c5eb5ef1321c15f5cae6b5646406d79b43ad1c3f6abf043daef0bf7d23bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ab3c5eb5ef1321c15f5cae6b5646406d79b43ad1c3f6abf043daef0bf7d23bb", kill_on_drop: false }`
[INFO] [stdout] 6ab3c5eb5ef1321c15f5cae6b5646406d79b43ad1c3f6abf043daef0bf7d23bb
[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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0d871ffd369ee1b37ade5193b404c986174e3638e8c8a1c069fc2b1ab6614b0e
[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" "0d871ffd369ee1b37ade5193b404c986174e3638e8c8a1c069fc2b1ab6614b0e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling trybuild v1.0.35
[INFO] [stderr]     Checking termcolor v1.1.2
[INFO] [stderr]     Checking dissimilar v1.0.2
[INFO] [stderr]     Checking glob v0.3.0
[INFO] [stderr]     Checking log v0.4.11
[INFO] [stderr]     Checking proc-macro2 v1.0.24
[INFO] [stderr]     Checking nb-connect v1.0.2
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]    Compiling syn v1.0.54
[INFO] [stderr]     Checking polling v2.0.2
[INFO] [stderr]     Checking kv-log-macro v1.0.7
[INFO] [stderr]     Checking quote v1.0.7
[INFO] [stderr]    Compiling crossbeam-utils v0.8.1
[INFO] [stderr]     Checking futures-lite v1.11.2
[INFO] [stderr]     Checking async-io v1.3.1
[INFO] [stderr]     Checking async-executor v1.4.0
[INFO] [stderr]     Checking blocking v1.0.2
[INFO] [stderr]     Checking async-global-executor v1.4.3
[INFO] [stderr]     Checking maybe-async v0.2.2 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling serde_derive v1.0.118
[INFO] [stderr]    Compiling tokio-macros v0.2.6
[INFO] [stderr]    Compiling async-attributes v1.1.1
[INFO] [stderr]    Compiling async-trait v0.1.42
[INFO] [stderr]     Checking async-std v1.7.0
[INFO] [stderr]     Checking tokio v0.2.23
[INFO] [stderr]     Checking serde v1.0.118
[INFO] [stderr]     Checking toml v0.5.7
[INFO] [stderr]     Checking serde_json v1.0.60
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 50.66s
[INFO] running `Command { std: "docker" "inspect" "0d871ffd369ee1b37ade5193b404c986174e3638e8c8a1c069fc2b1ab6614b0e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d871ffd369ee1b37ade5193b404c986174e3638e8c8a1c069fc2b1ab6614b0e", kill_on_drop: false }`
[INFO] [stdout] 0d871ffd369ee1b37ade5193b404c986174e3638e8c8a1c069fc2b1ab6614b0e