[INFO] updating cached repository https://github.com/hurou927/rust-async-futures-sample
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7daf40950145321adff6c80f19f27ff094177798
[INFO] checking hurou927/rust-async-futures-sample against master#fdc0011561c6365c596dfd8fa1ef388162bc89c7 for pr-66852
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhurou927%2Frust-async-futures-sample" "/workspace/builds/worker-5/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hurou927/rust-async-futures-sample on toolchain fdc0011561c6365c596dfd8fa1ef388162bc89c7
[INFO] running `"/workspace/cargo-home/bin/cargo" "+fdc0011561c6365c596dfd8fa1ef388162bc89c7" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/hurou927/rust-async-futures-sample
[INFO] finished tweaking git repo https://github.com/hurou927/rust-async-futures-sample
[INFO] tweaked toml for git repo https://github.com/hurou927/rust-async-futures-sample written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/hurou927/rust-async-futures-sample already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+fdc0011561c6365c596dfd8fa1ef388162bc89c7" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+fdc0011561c6365c596dfd8fa1ef388162bc89c7" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] a505d72c31c6081bfcd1e4405e188a8ac7a6cf4c27522f884651f3345c027a6d
[INFO] running `"docker" "start" "-a" "a505d72c31c6081bfcd1e4405e188a8ac7a6cf4c27522f884651f3345c027a6d"`
[INFO] [stderr]    Compiling syn v1.0.7
[INFO] [stderr]     Checking futures-core v0.3.1
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[INFO] [stderr] warning: unused imports: `LocalSpawner`, `pending`, `ready`
[INFO] [stderr]  --> src/main.rs:6:49
[INFO] [stderr]   |
[INFO] [stderr] 6 |     executor::{block_on, ThreadPool, LocalPool, LocalSpawner},
[INFO] [stderr]   |                                                 ^^^^^^^^^^^^
[INFO] [stderr] 7 |     future,
[INFO] [stderr] 8 |     future::{ready, pending},
[INFO] [stderr]   |              ^^^^^  ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `LocalSpawner`, `pending`, `ready`
[INFO] [stderr]  --> src/main.rs:6:49
[INFO] [stderr]   |
[INFO] [stderr] 6 |     executor::{block_on, ThreadPool, LocalPool, LocalSpawner},
[INFO] [stderr]   |                                                 ^^^^^^^^^^^^
[INFO] [stderr] 7 |     future,
[INFO] [stderr] 8 |     future::{ready, pending},
[INFO] [stderr]   |              ^^^^^  ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 22s
[INFO] running `"docker" "inspect" "a505d72c31c6081bfcd1e4405e188a8ac7a6cf4c27522f884651f3345c027a6d"`
[INFO] running `"docker" "rm" "-f" "a505d72c31c6081bfcd1e4405e188a8ac7a6cf4c27522f884651f3345c027a6d"`
[INFO] [stdout] a505d72c31c6081bfcd1e4405e188a8ac7a6cf4c27522f884651f3345c027a6d