[INFO] fetching crate serial2-tokio 0.1.23...
[INFO] testing serial2-tokio-0.1.23 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate serial2-tokio 0.1.23 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate serial2-tokio 0.1.23
[INFO] removed 0 missing examples
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate serial2-tokio 0.1.23
[INFO] tweaked toml for crates.io crate serial2-tokio 0.1.23 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate serial2-tokio 0.1.23 on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate serial2-tokio 0.1.23 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 34078ff92399b8bf07242a80a394a71818b52e676c58fb796c73a4dc28ae42dc
[INFO] running `Command { std: "docker" "start" "-a" "34078ff92399b8bf07242a80a394a71818b52e676c58fb796c73a4dc28ae42dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "34078ff92399b8bf07242a80a394a71818b52e676c58fb796c73a4dc28ae42dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "34078ff92399b8bf07242a80a394a71818b52e676c58fb796c73a4dc28ae42dc", kill_on_drop: false }`
[INFO] [stdout] 34078ff92399b8bf07242a80a394a71818b52e676c58fb796c73a4dc28ae42dc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2c703e19f359889d90a1f72491382fb64cef5ca3ca5b08a953a941fcdd903a74
[INFO] running `Command { std: "docker" "start" "-a" "2c703e19f359889d90a1f72491382fb64cef5ca3ca5b08a953a941fcdd903a74", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.184
[INFO] [stderr]    Compiling pin-project-lite v0.2.17
[INFO] [stderr]    Compiling socket2 v0.6.3
[INFO] [stderr]    Compiling mio v1.2.0
[INFO] [stderr]    Compiling serial2 v0.2.36
[INFO] [stderr]    Compiling tokio v1.51.0
[INFO] [stderr]    Compiling serial2-tokio v0.1.23 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.06s
[INFO] running `Command { std: "docker" "inspect" "2c703e19f359889d90a1f72491382fb64cef5ca3ca5b08a953a941fcdd903a74", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2c703e19f359889d90a1f72491382fb64cef5ca3ca5b08a953a941fcdd903a74", kill_on_drop: false }`
[INFO] [stdout] 2c703e19f359889d90a1f72491382fb64cef5ca3ca5b08a953a941fcdd903a74
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 996777c04057dc99a2020a039fc973b9213da8f77094f1665afd59bfa689759f
[INFO] running `Command { std: "docker" "start" "-a" "996777c04057dc99a2020a039fc973b9213da8f77094f1665afd59bfa689759f", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]    Compiling semver v1.0.28
[INFO] [stderr]    Compiling rustix v1.1.4
[INFO] [stderr]    Compiling linux-raw-sys v0.12.1
[INFO] [stderr]    Compiling bitflags v2.11.0
[INFO] [stderr]    Compiling bytes v1.11.1
[INFO] [stderr]    Compiling yansi v1.0.1
[INFO] [stderr]    Compiling unicode-width v0.2.2
[INFO] [stderr]    Compiling diff v0.1.13
[INFO] [stderr]    Compiling serial2 v0.2.36
[INFO] [stderr]    Compiling rustc_version v0.4.1
[INFO] [stderr]    Compiling assert2-macros v0.4.0
[INFO] [stderr]    Compiling terminal_size v0.4.4
[INFO] [stderr]    Compiling tokio-macros v2.7.0
[INFO] [stderr]    Compiling assert2 v0.4.0
[INFO] [stderr]    Compiling tokio v1.51.0
[INFO] [stderr]    Compiling serial2-tokio v0.1.23 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0599]: no associated function or constant named `pair` found for struct `SerialPort` in the current scope
[INFO] [stdout]    --> tests/pair.rs:9:47
[INFO] [stdout]     |
[INFO] [stdout]   9 |     assert!(let Ok((mut a, mut b)) = SerialPort::pair());
[INFO] [stdout]     |                                                  ^^^^ associated function or constant not found in `SerialPort`
[INFO] [stdout]     |
[INFO] [stdout] note: if you're trying to build a new `SerialPort`, consider using `SerialPort::open` which returns `Result<SerialPort, std::io::Error>`
[INFO] [stdout]    --> src/lib.rs:107:2
[INFO] [stdout]     |
[INFO] [stdout] 107 |     pub fn open(path: impl AsRef<Path>, settings: impl IntoSettings) -> std::io::Result<Self> {
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `serial2-tokio` (test "pair") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "996777c04057dc99a2020a039fc973b9213da8f77094f1665afd59bfa689759f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "996777c04057dc99a2020a039fc973b9213da8f77094f1665afd59bfa689759f", kill_on_drop: false }`
[INFO] [stdout] 996777c04057dc99a2020a039fc973b9213da8f77094f1665afd59bfa689759f
