[INFO] fetching crate par-iter-sync 0.1.11...
[INFO] checking par-iter-sync-0.1.11 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate par-iter-sync 0.1.11 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate par-iter-sync 0.1.11 on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate par-iter-sync 0.1.11
[INFO] finished tweaking crates.io crate par-iter-sync 0.1.11
[INFO] tweaked toml for crates.io crate par-iter-sync 0.1.11 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 14 packages
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b7f0e3598cc7f3fe6c6bb525f5724530f4be656a74738a8d2f31c6fc546b5919
[INFO] running `Command { std: "docker" "start" "-a" "b7f0e3598cc7f3fe6c6bb525f5724530f4be656a74738a8d2f31c6fc546b5919", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b7f0e3598cc7f3fe6c6bb525f5724530f4be656a74738a8d2f31c6fc546b5919", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b7f0e3598cc7f3fe6c6bb525f5724530f4be656a74738a8d2f31c6fc546b5919", kill_on_drop: false }`
[INFO] [stdout] b7f0e3598cc7f3fe6c6bb525f5724530f4be656a74738a8d2f31c6fc546b5919
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 540eb0d6c838f7dd73d4e632672f1133faf472e299f2e0b8e6b77aea411862c5
[INFO] running `Command { std: "docker" "start" "-a" "540eb0d6c838f7dd73d4e632672f1133faf472e299f2e0b8e6b77aea411862c5", kill_on_drop: false }`
[INFO] [stderr]     Checking crossbeam-queue v0.3.11
[INFO] [stderr]     Checking crossbeam-channel v0.5.12
[INFO] [stderr]     Checking crossbeam v0.8.4
[INFO] [stderr]     Checking par-iter-sync v0.1.11 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `num_cpus` is imported redundantly
[INFO] [stdout]  --> src/iter_async.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use num_cpus;
[INFO] [stdout]   |     ^^^^^^^^ the item `num_cpus` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num_cpus` is imported redundantly
[INFO] [stdout]  --> src/iter_async.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use num_cpus;
[INFO] [stdout]   |     ^^^^^^^^ the item `num_cpus` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num_cpus` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:220:5
[INFO] [stdout]     |
[INFO] [stdout] 220 | use num_cpus;
[INFO] [stdout]     |     ^^^^^^^^ the item `num_cpus` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `num_cpus` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:220:5
[INFO] [stdout]     |
[INFO] [stdout] 220 | use num_cpus;
[INFO] [stdout]     |     ^^^^^^^^ the item `num_cpus` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.62s
[INFO] running `Command { std: "docker" "inspect" "540eb0d6c838f7dd73d4e632672f1133faf472e299f2e0b8e6b77aea411862c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "540eb0d6c838f7dd73d4e632672f1133faf472e299f2e0b8e6b77aea411862c5", kill_on_drop: false }`
[INFO] [stdout] 540eb0d6c838f7dd73d4e632672f1133faf472e299f2e0b8e6b77aea411862c5