[INFO] fetching crate maybe-single 0.15.0... [INFO] testing maybe-single-0.15.0 against master#62efba8a050c64249dab942951bb28f710208bc8 for pr-90799 [INFO] extracting crate maybe-single 0.15.0 into /workspace/builds/worker-87/source [INFO] validating manifest of crates.io crate maybe-single 0.15.0 on toolchain 62efba8a050c64249dab942951bb28f710208bc8 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "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-87/source/Cargo.toml [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "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" "+62efba8a050c64249dab942951bb28f710208bc8" "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-87/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-87/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:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] c915ff44d1b79cdb0138ed0480b226ec4b82cb57a01c23418832c0167db12157 [INFO] running `Command { std: "docker" "start" "-a" "c915ff44d1b79cdb0138ed0480b226ec4b82cb57a01c23418832c0167db12157", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "c915ff44d1b79cdb0138ed0480b226ec4b82cb57a01c23418832c0167db12157", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "c915ff44d1b79cdb0138ed0480b226ec4b82cb57a01c23418832c0167db12157", kill_on_drop: false }` [INFO] [stdout] c915ff44d1b79cdb0138ed0480b226ec4b82cb57a01c23418832c0167db12157 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-87/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-87/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:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] d108bebb4a3537610e68ff010422b607c8181674cf916254df0c2437cd1357c3 [INFO] running `Command { std: "docker" "start" "-a" "d108bebb4a3537610e68ff010422b607c8181674cf916254df0c2437cd1357c3", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.108 [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 1.60s [INFO] running `Command { std: "docker" "inspect" "d108bebb4a3537610e68ff010422b607c8181674cf916254df0c2437cd1357c3", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "d108bebb4a3537610e68ff010422b607c8181674cf916254df0c2437cd1357c3", kill_on_drop: false }` [INFO] [stdout] d108bebb4a3537610e68ff010422b607c8181674cf916254df0c2437cd1357c3 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-87/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-87/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:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] f16f242d65d595064bcb548d42c3d2c8b31f98f47ca44f0a457fa5a62f06740e [INFO] running `Command { std: "docker" "start" "-a" "f16f242d65d595064bcb548d42c3d2c8b31f98f47ca44f0a457fa5a62f06740e", kill_on_drop: false }` [INFO] [stderr] Compiling unicode-xid v0.2.2 [INFO] [stderr] Compiling syn v1.0.82 [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] [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 proc-macro2 v1.0.32 [INFO] [stderr] Compiling rand_core v0.6.3 [INFO] [stderr] Compiling rand_chacha v0.3.1 [INFO] [stderr] Compiling tokio v1.14.0 [INFO] [stderr] Compiling quote v1.0.10 [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 10.66s [INFO] running `Command { std: "docker" "inspect" "f16f242d65d595064bcb548d42c3d2c8b31f98f47ca44f0a457fa5a62f06740e", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "f16f242d65d595064bcb548d42c3d2c8b31f98f47ca44f0a457fa5a62f06740e", kill_on_drop: false }` [INFO] [stdout] f16f242d65d595064bcb548d42c3d2c8b31f98f47ca44f0a457fa5a62f06740e [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-87/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-87/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:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] 8711de94828bcaa99177618c5d7a34cb106b1805a684c79e3f64889b03a70e02 [INFO] running `Command { std: "docker" "start" "-a" "8711de94828bcaa99177618c5d7a34cb106b1805a684c79e3f64889b03a70e02", 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 0.07s [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/maybe_single-0a2ad35da4d0503d) [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 0.17s [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" "8711de94828bcaa99177618c5d7a34cb106b1805a684c79e3f64889b03a70e02", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "8711de94828bcaa99177618c5d7a34cb106b1805a684c79e3f64889b03a70e02", kill_on_drop: false }` [INFO] [stdout] 8711de94828bcaa99177618c5d7a34cb106b1805a684c79e3f64889b03a70e02