[INFO] fetching crate async-attributes 1.1.1...
[INFO] checking async-attributes-1.1.1 against master#0d37dca25a51fb900a402c94c8818ad1c2789e30 for pr-77526
[INFO] extracting crate async-attributes 1.1.1 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate async-attributes 1.1.1 on toolchain 0d37dca25a51fb900a402c94c8818ad1c2789e30
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate async-attributes 1.1.1
[INFO] finished tweaking crates.io crate async-attributes 1.1.1
[INFO] tweaked toml for crates.io crate async-attributes 1.1.1 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate crates.io crate async-attributes 1.1.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "fetch" "--locked" "--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-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ff22e9f5490f2c00f4df3f5fddee9145ebc95fb20845c989a89f0c166ebf8e71
[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" "ff22e9f5490f2c00f4df3f5fddee9145ebc95fb20845c989a89f0c166ebf8e71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ff22e9f5490f2c00f4df3f5fddee9145ebc95fb20845c989a89f0c166ebf8e71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff22e9f5490f2c00f4df3f5fddee9145ebc95fb20845c989a89f0c166ebf8e71", kill_on_drop: false }`
[INFO] [stdout] ff22e9f5490f2c00f4df3f5fddee9145ebc95fb20845c989a89f0c166ebf8e71
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f4ffe2caef6f981448927c9ad4862533a09a34b44d80a38ae11d97099ccb21cb
[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" "f4ffe2caef6f981448927c9ad4862533a09a34b44d80a38ae11d97099ccb21cb", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.3
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]     Checking unicode-xid v0.2.0
[INFO] [stderr]     Checking pin-utils v0.1.0-alpha.4
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.18
[INFO] [stderr]     Checking futures-io-preview v0.3.0-alpha.18
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]     Checking log v0.4.8
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.18
[INFO] [stderr]     Checking crossbeam-channel v0.3.9
[INFO] [stderr]     Checking async-task v1.0.0
[INFO] [stderr]     Checking quote v1.0.2
[INFO] [stderr]     Checking iovec v0.1.2
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking num_cpus v1.10.1
[INFO] [stderr]     Checking futures-timer v0.4.0
[INFO] [stderr]     Checking mio v0.6.19
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]     Checking async-std v0.99.5
[INFO] [stderr]     Checking async-attributes v1.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: unused extern crate
[INFO] [stdout]   --> src/lib.rs:30:1
[INFO] [stdout]    |
[INFO] [stdout] 30 | extern crate proc_macro;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^ help: remove it
[INFO] [stdout]    |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]   --> src/lib.rs:26:45
[INFO] [stdout]    |
[INFO] [stdout] 26 | #![forbid(unsafe_code, future_incompatible, rust_2018_idioms)]
[INFO] [stdout]    |                                             ^^^^^^^^^^^^^^^^
[INFO] [stdout]    = note: `#[forbid(unused_extern_crates)]` implied by `#[forbid(rust_2018_idioms)]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `async-attributes`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: unused extern crate
[INFO] [stdout]   --> src/lib.rs:30:1
[INFO] [stdout]    |
[INFO] [stdout] 30 | extern crate proc_macro;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^ help: remove it
[INFO] [stdout]    |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]   --> src/lib.rs:26:45
[INFO] [stdout]    |
[INFO] [stdout] 26 | #![forbid(unsafe_code, future_incompatible, rust_2018_idioms)]
[INFO] [stdout]    |                                             ^^^^^^^^^^^^^^^^
[INFO] [stdout]    = note: `#[forbid(unused_extern_crates)]` implied by `#[forbid(rust_2018_idioms)]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "f4ffe2caef6f981448927c9ad4862533a09a34b44d80a38ae11d97099ccb21cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f4ffe2caef6f981448927c9ad4862533a09a34b44d80a38ae11d97099ccb21cb", kill_on_drop: false }`
[INFO] [stdout] f4ffe2caef6f981448927c9ad4862533a09a34b44d80a38ae11d97099ccb21cb