[INFO] fetching crate maybe-single 0.15.0... [INFO] testing maybe-single-0.15.0 against master#432e145bd5a974c5b6f4dd9b352891bd7502b69d for pr-87041 [INFO] extracting crate maybe-single 0.15.0 into /workspace/builds/worker-11/source [INFO] validating manifest of crates.io crate maybe-single 0.15.0 on toolchain 432e145bd5a974c5b6f4dd9b352891bd7502b69d [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+432e145bd5a974c5b6f4dd9b352891bd7502b69d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking crates.io crate maybe-single 0.15.0 [INFO] finished tweaking crates.io crate maybe-single 0.15.0 [INFO] tweaked toml for crates.io crate maybe-single 0.15.0 written to /workspace/builds/worker-11/source/Cargo.toml [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+432e145bd5a974c5b6f4dd9b352891bd7502b69d" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+432e145bd5a974c5b6f4dd9b352891bd7502b69d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+432e145bd5a974c5b6f4dd9b352891bd7502b69d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 1df4c2904569f70a2c739725a723a3c1e5b5fe12aa8730981158653ddaa4321d [INFO] running `Command { std: "docker" "start" "-a" "1df4c2904569f70a2c739725a723a3c1e5b5fe12aa8730981158653ddaa4321d", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "1df4c2904569f70a2c739725a723a3c1e5b5fe12aa8730981158653ddaa4321d", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "1df4c2904569f70a2c739725a723a3c1e5b5fe12aa8730981158653ddaa4321d", kill_on_drop: false }` [INFO] [stdout] 1df4c2904569f70a2c739725a723a3c1e5b5fe12aa8730981158653ddaa4321d [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+432e145bd5a974c5b6f4dd9b352891bd7502b69d" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 35a5ebb703a89f60b2e7502d72b3e2782eab078febe4ada3ec634dcbb3bea4bc [INFO] running `Command { std: "docker" "start" "-a" "35a5ebb703a89f60b2e7502d72b3e2782eab078febe4ada3ec634dcbb3bea4bc", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.98 [INFO] [stderr] Compiling cfg-if v1.0.0 [INFO] [stderr] Compiling scopeguard v1.1.0 [INFO] [stderr] Compiling smallvec v1.6.1 [INFO] [stderr] Compiling instant v0.1.10 [INFO] [stderr] Compiling lock_api v0.4.4 [INFO] [stderr] Compiling parking_lot_core v0.8.3 [INFO] [stderr] Compiling parking_lot v0.11.1 [INFO] [stderr] Compiling maybe-single v0.15.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: field is never read: `read_lock` [INFO] [stdout] --> src/blocking.rs:73:5 [INFO] [stdout] | [INFO] [stdout] 73 | read_lock: Option>, [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `write_lock` [INFO] [stdout] --> src/blocking.rs:74:5 [INFO] [stdout] | [INFO] [stdout] 74 | write_lock: Option>, [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 2.67s [INFO] running `Command { std: "docker" "inspect" "35a5ebb703a89f60b2e7502d72b3e2782eab078febe4ada3ec634dcbb3bea4bc", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "35a5ebb703a89f60b2e7502d72b3e2782eab078febe4ada3ec634dcbb3bea4bc", kill_on_drop: false }` [INFO] [stdout] 35a5ebb703a89f60b2e7502d72b3e2782eab078febe4ada3ec634dcbb3bea4bc [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+432e145bd5a974c5b6f4dd9b352891bd7502b69d" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 0eec0a2b6c046dd53ffbc637a3dc217f0b61cbda3be2efa3bc6960dda91e41c4 [INFO] running `Command { std: "docker" "start" "-a" "0eec0a2b6c046dd53ffbc637a3dc217f0b61cbda3be2efa3bc6960dda91e41c4", kill_on_drop: false }` [INFO] [stderr] Compiling proc-macro2 v1.0.27 [INFO] [stderr] Compiling unicode-xid v0.2.2 [INFO] [stderr] Compiling syn v1.0.73 [INFO] [stderr] Compiling autocfg v1.0.1 [INFO] [stderr] Compiling once_cell v1.8.0 [INFO] [stderr] Compiling getrandom v0.2.3 [INFO] [stderr] Compiling num_cpus v1.13.0 [INFO] [stdout] warning: field is never read: `read_lock` [INFO] [stdout] --> src/blocking.rs:73:5 [INFO] [stdout] | [INFO] [stdout] 73 | read_lock: Option>, [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `write_lock` [INFO] [stdout] --> src/blocking.rs:74:5 [INFO] [stdout] | [INFO] [stdout] 74 | write_lock: Option>, [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Compiling rand_core v0.6.3 [INFO] [stderr] Compiling rand_chacha v0.3.1 [INFO] [stderr] Compiling tokio v1.8.1 [INFO] [stderr] Compiling rand v0.8.4 [INFO] [stderr] Compiling quote v1.0.9 [INFO] [stderr] Compiling tokio-macros v1.3.0 [INFO] [stderr] Compiling maybe-single v0.15.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: field is never read: `read_lock` [INFO] [stdout] --> src/blocking.rs:73:5 [INFO] [stdout] | [INFO] [stdout] 73 | read_lock: Option>, [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `write_lock` [INFO] [stdout] --> src/blocking.rs:74:5 [INFO] [stdout] | [INFO] [stdout] 74 | write_lock: Option>, [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 13.96s [INFO] running `Command { std: "docker" "inspect" "0eec0a2b6c046dd53ffbc637a3dc217f0b61cbda3be2efa3bc6960dda91e41c4", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "0eec0a2b6c046dd53ffbc637a3dc217f0b61cbda3be2efa3bc6960dda91e41c4", kill_on_drop: false }` [INFO] [stdout] 0eec0a2b6c046dd53ffbc637a3dc217f0b61cbda3be2efa3bc6960dda91e41c4 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+432e145bd5a974c5b6f4dd9b352891bd7502b69d" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] 006ff4ba7065654e9a73eced3ec93fc3aadd417c2a5c7eb42d6b8f6bc5fa4b42 [INFO] running `Command { std: "docker" "start" "-a" "006ff4ba7065654e9a73eced3ec93fc3aadd417c2a5c7eb42d6b8f6bc5fa4b42", kill_on_drop: false }` [INFO] [stderr] warning: field is never read: `read_lock` [INFO] [stderr] --> src/blocking.rs:73:5 [INFO] [stderr] | [INFO] [stderr] 73 | read_lock: Option>, [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: field is never read: `write_lock` [INFO] [stderr] --> src/blocking.rs:74:5 [INFO] [stderr] | [INFO] [stderr] 74 | write_lock: Option>, [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: 2 warnings emitted [INFO] [stderr] [INFO] [stderr] warning: field is never read: `read_lock` [INFO] [stderr] --> src/blocking.rs:73:5 [INFO] [stderr] | [INFO] [stderr] 73 | read_lock: Option>, [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: field is never read: `write_lock` [INFO] [stderr] --> src/blocking.rs:74:5 [INFO] [stderr] | [INFO] [stderr] 74 | write_lock: Option>, [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: 2 warnings emitted [INFO] [stderr] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 0.02s [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/maybe_single-576096a032c7ece3) [INFO] [stdout] [INFO] [stdout] running 2 tests [INFO] [stdout] test blocking::test::should_execute_in_parallel ... ok [INFO] [stderr] Doc-tests maybe-single [INFO] [stdout] test blocking::test::should_execute_serially ... ok [INFO] [stdout] [INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.29s [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] running 0 tests [INFO] [stdout] [INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] running `Command { std: "docker" "inspect" "006ff4ba7065654e9a73eced3ec93fc3aadd417c2a5c7eb42d6b8f6bc5fa4b42", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "006ff4ba7065654e9a73eced3ec93fc3aadd417c2a5c7eb42d6b8f6bc5fa4b42", kill_on_drop: false }` [INFO] [stdout] 006ff4ba7065654e9a73eced3ec93fc3aadd417c2a5c7eb42d6b8f6bc5fa4b42