[INFO] fetching crate crossfire 0.1.4...
[INFO] checking crossfire-0.1.4 against beta for pr-78714
[INFO] extracting crate crossfire 0.1.4 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate crossfire 0.1.4 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate crossfire 0.1.4
[INFO] finished tweaking crates.io crate crossfire 0.1.4
[INFO] tweaked toml for crates.io crate crossfire 0.1.4 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fd64c509c244f128d779aac89e60370a2354b40bbd2ce7366b8aa56164cae434
[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" "fd64c509c244f128d779aac89e60370a2354b40bbd2ce7366b8aa56164cae434", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fd64c509c244f128d779aac89e60370a2354b40bbd2ce7366b8aa56164cae434", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd64c509c244f128d779aac89e60370a2354b40bbd2ce7366b8aa56164cae434", kill_on_drop: false }`
[INFO] [stdout] fd64c509c244f128d779aac89e60370a2354b40bbd2ce7366b8aa56164cae434
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+beta" "check" "--frozen" "--all" "--all-targets" "--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] 46dd7b98a11ebc776f53ed5f7ad81af9c0e9b2eb57f2467d97f80e15283bd281
[INFO] running `Command { std: "docker" "start" "-a" "46dd7b98a11ebc776f53ed5f7ad81af9c0e9b2eb57f2467d97f80e15283bd281", kill_on_drop: false }`
[INFO] [stderr]     Checking thread_local v0.3.4
[INFO] [stderr]     Checking atty v0.2.11
[INFO] [stderr]    Compiling futures-macro v0.3.8
[INFO] [stderr]    Compiling async-trait v0.1.41
[INFO] [stderr]     Checking tokio v0.2.23
[INFO] [stderr]     Checking stderrlog v0.4.3
[INFO] [stderr]     Checking futures-util v0.3.8
[INFO] [stderr]     Checking futures-executor v0.3.8
[INFO] [stderr]     Checking futures v0.3.8
[INFO] [stderr]     Checking crossfire v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `tx_wakers`
[INFO] [stdout]    --> src/mpmc/unbounded.rs:278:34
[INFO] [stdout]     |
[INFO] [stdout] 278 | ...                   let (tx_wakers, rx_wakers) = rx_f.get_waker_length();
[INFO] [stdout]     |                            ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_tx_wakers`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rx_wakers`
[INFO] [stdout]    --> src/mpmc/unbounded.rs:278:45
[INFO] [stdout]     |
[INFO] [stdout] 278 | ...                   let (tx_wakers, rx_wakers) = rx_f.get_waker_length();
[INFO] [stdout]     |                                       ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_rx_wakers`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 18.11s
[INFO] running `Command { std: "docker" "inspect" "46dd7b98a11ebc776f53ed5f7ad81af9c0e9b2eb57f2467d97f80e15283bd281", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "46dd7b98a11ebc776f53ed5f7ad81af9c0e9b2eb57f2467d97f80e15283bd281", kill_on_drop: false }`
[INFO] [stdout] 46dd7b98a11ebc776f53ed5f7ad81af9c0e9b2eb57f2467d97f80e15283bd281