[INFO] fetching crate maybe-single 0.15.0... [INFO] testing maybe-single-0.15.0 against master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031 [INFO] extracting crate maybe-single 0.15.0 into /workspace/builds/worker-54/source [INFO] validating manifest of crates.io crate maybe-single 0.15.0 on toolchain a77da2d454e6caa227a85b16410b95f93495e7e0 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "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-54/source/Cargo.toml [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }` [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "fetch" "--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-54/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 3e06f07c98475e534bf597967622c0eb170398e682a7b7245fd99eb2beab9cbb [INFO] running `Command { std: "docker" "start" "-a" "3e06f07c98475e534bf597967622c0eb170398e682a7b7245fd99eb2beab9cbb", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "3e06f07c98475e534bf597967622c0eb170398e682a7b7245fd99eb2beab9cbb", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "3e06f07c98475e534bf597967622c0eb170398e682a7b7245fd99eb2beab9cbb", kill_on_drop: false }` [INFO] [stdout] 3e06f07c98475e534bf597967622c0eb170398e682a7b7245fd99eb2beab9cbb [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 35f3513c109eb05fa7ef2739b80a1fba8314e277297728f617cf35e949099de8 [INFO] running `Command { std: "docker" "start" "-a" "35f3513c109eb05fa7ef2739b80a1fba8314e277297728f617cf35e949099de8", kill_on_drop: false }` [INFO] [stderr] Compiling parking_lot_core v0.8.5 [INFO] [stderr] Compiling cfg-if v1.0.0 [INFO] [stderr] Compiling smallvec v1.7.0 [INFO] [stderr] Compiling scopeguard v1.1.0 [INFO] [stderr] Compiling instant v0.1.12 [INFO] [stderr] Compiling lock_api v0.4.5 [INFO] [stderr] Compiling parking_lot v0.11.2 [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 1.33s [INFO] running `Command { std: "docker" "inspect" "35f3513c109eb05fa7ef2739b80a1fba8314e277297728f617cf35e949099de8", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "35f3513c109eb05fa7ef2739b80a1fba8314e277297728f617cf35e949099de8", kill_on_drop: false }` [INFO] [stdout] 35f3513c109eb05fa7ef2739b80a1fba8314e277297728f617cf35e949099de8 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] ce9579e85141d5e88817698049242e6c25c9fdde6bad4565511b71c40cb20798 [INFO] running `Command { std: "docker" "start" "-a" "ce9579e85141d5e88817698049242e6c25c9fdde6bad4565511b71c40cb20798", kill_on_drop: false }` [INFO] [stderr] Compiling autocfg v1.0.1 [INFO] [stderr] Compiling ppv-lite86 v0.2.15 [INFO] [stderr] Compiling pin-project-lite v0.2.7 [INFO] [stderr] Compiling once_cell v1.8.0 [INFO] [stderr] Compiling getrandom v0.2.3 [INFO] [stderr] Compiling num_cpus v1.13.0 [INFO] [stderr] Compiling syn v1.0.81 [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 tokio v1.14.0 [INFO] [stderr] Compiling rand_chacha v0.3.1 [INFO] [stderr] Compiling rand v0.8.4 [INFO] [stderr] Compiling tokio-macros v1.6.0 [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 11.20s [INFO] running `Command { std: "docker" "inspect" "ce9579e85141d5e88817698049242e6c25c9fdde6bad4565511b71c40cb20798", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "ce9579e85141d5e88817698049242e6c25c9fdde6bad4565511b71c40cb20798", kill_on_drop: false }` [INFO] [stdout] ce9579e85141d5e88817698049242e6c25c9fdde6bad4565511b71c40cb20798 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] 4fee2278e606724c33fd17b6468a791e9f3bd37ecbc3125b9db6f6e0de49dcca [INFO] running `Command { std: "docker" "start" "-a" "4fee2278e606724c33fd17b6468a791e9f3bd37ecbc3125b9db6f6e0de49dcca", 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: `maybe-single` (lib) generated 2 warnings [INFO] [stderr] warning: `maybe-single` (lib test) generated 2 warnings (2 duplicates) [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 0.14s [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/maybe_single-891b17384b37eca7) [INFO] [stdout] [INFO] [stdout] running 2 tests [INFO] [stdout] test blocking::test::should_execute_in_parallel ... ok [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 0.28s [INFO] [stdout] [INFO] [stderr] Doc-tests maybe-single [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" "4fee2278e606724c33fd17b6468a791e9f3bd37ecbc3125b9db6f6e0de49dcca", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "4fee2278e606724c33fd17b6468a791e9f3bd37ecbc3125b9db6f6e0de49dcca", kill_on_drop: false }` [INFO] [stdout] 4fee2278e606724c33fd17b6468a791e9f3bd37ecbc3125b9db6f6e0de49dcca