[INFO] fetching crate maybe-single 0.16.1...
[INFO] testing maybe-single-0.16.1 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate maybe-single 0.16.1 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate maybe-single 0.16.1
[INFO] finished tweaking crates.io crate maybe-single 0.16.1
[INFO] tweaked toml for crates.io crate maybe-single 0.16.1 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate maybe-single 0.16.1 on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 48 packages to latest compatible versions
[INFO] [stderr]       Adding rand v0.8.5 (available: v0.9.2)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b099f73045e5dd956abc647f6b8c7f7b2d8fd092663181f4f3234f2113915206
[INFO] running `Command { std: "docker" "start" "-a" "b099f73045e5dd956abc647f6b8c7f7b2d8fd092663181f4f3234f2113915206", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b099f73045e5dd956abc647f6b8c7f7b2d8fd092663181f4f3234f2113915206", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b099f73045e5dd956abc647f6b8c7f7b2d8fd092663181f4f3234f2113915206", kill_on_drop: false }`
[INFO] [stdout] b099f73045e5dd956abc647f6b8c7f7b2d8fd092663181f4f3234f2113915206
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2424716e09d5f80eecd823a3198c07807c1d33ecf337020691a79b4cbd420580
[INFO] running `Command { std: "docker" "start" "-a" "2424716e09d5f80eecd823a3198c07807c1d33ecf337020691a79b4cbd420580", kill_on_drop: false }`
[INFO] [stderr]    Compiling maybe-single v0.16.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.16s
[INFO] running `Command { std: "docker" "inspect" "2424716e09d5f80eecd823a3198c07807c1d33ecf337020691a79b4cbd420580", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2424716e09d5f80eecd823a3198c07807c1d33ecf337020691a79b4cbd420580", kill_on_drop: false }`
[INFO] [stdout] 2424716e09d5f80eecd823a3198c07807c1d33ecf337020691a79b4cbd420580
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4294e56b18029e319be47edd8465cd8a376f3c531a986f0e67dfc372e6ec755a
[INFO] running `Command { std: "docker" "start" "-a" "4294e56b18029e319be47edd8465cd8a376f3c531a986f0e67dfc372e6ec755a", kill_on_drop: false }`
[INFO] [stderr]    Compiling tokio v1.47.1
[INFO] [stderr]    Compiling maybe-single v0.16.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 3.49s
[INFO] running `Command { std: "docker" "inspect" "4294e56b18029e319be47edd8465cd8a376f3c531a986f0e67dfc372e6ec755a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4294e56b18029e319be47edd8465cd8a376f3c531a986f0e67dfc372e6ec755a", kill_on_drop: false }`
[INFO] [stdout] 4294e56b18029e319be47edd8465cd8a376f3c531a986f0e67dfc372e6ec755a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 8e8e7d2ddbaaf325f7a46a87dd22d3fec2e3d43a4f1645436038e51ca47e6bec
[INFO] running `Command { std: "docker" "start" "-a" "8e8e7d2ddbaaf325f7a46a87dd22d3fec2e3d43a4f1645436038e51ca47e6bec", kill_on_drop: false }`
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.09s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/maybe_single-3e45bf214ab62997)
[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] [stderr]    Doc-tests maybe_single
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.04s
[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" "8e8e7d2ddbaaf325f7a46a87dd22d3fec2e3d43a4f1645436038e51ca47e6bec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8e8e7d2ddbaaf325f7a46a87dd22d3fec2e3d43a4f1645436038e51ca47e6bec", kill_on_drop: false }`
[INFO] [stdout] 8e8e7d2ddbaaf325f7a46a87dd22d3fec2e3d43a4f1645436038e51ca47e6bec