[INFO] fetching crate flipflop 0.2.0...
[INFO] testing flipflop-0.2.0 against beta-2026-03-05 for beta-1.95-1
[INFO] extracting crate flipflop 0.2.0 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate flipflop 0.2.0
[INFO] finished tweaking crates.io crate flipflop 0.2.0
[INFO] tweaked toml for crates.io crate flipflop 0.2.0 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate flipflop 0.2.0 on toolchain beta-2026-03-05
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-03-05" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate flipflop 0.2.0 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-2026-03-05" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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-2026-03-05" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 11936dc0e9c18b439ea35ac69fccfc9bd4deeea0e19aa5e6398b1c40dddd433a
[INFO] running `Command { std: "docker" "start" "-a" "11936dc0e9c18b439ea35ac69fccfc9bd4deeea0e19aa5e6398b1c40dddd433a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "11936dc0e9c18b439ea35ac69fccfc9bd4deeea0e19aa5e6398b1c40dddd433a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "11936dc0e9c18b439ea35ac69fccfc9bd4deeea0e19aa5e6398b1c40dddd433a", kill_on_drop: false }`
[INFO] [stdout] 11936dc0e9c18b439ea35ac69fccfc9bd4deeea0e19aa5e6398b1c40dddd433a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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-2026-03-05" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e289bb0838be43f32dbde8a3c250743f8c094d7bccacb780a3e1d3aba764a936
[INFO] running `Command { std: "docker" "start" "-a" "e289bb0838be43f32dbde8a3c250743f8c094d7bccacb780a3e1d3aba764a936", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.177
[INFO] [stderr]    Compiling getrandom v0.3.4
[INFO] [stderr]    Compiling rand_core v0.9.3
[INFO] [stderr]    Compiling rand_chacha v0.9.0
[INFO] [stderr]    Compiling rand v0.9.2
[INFO] [stderr]    Compiling flipflop v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.17s
[INFO] running `Command { std: "docker" "inspect" "e289bb0838be43f32dbde8a3c250743f8c094d7bccacb780a3e1d3aba764a936", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e289bb0838be43f32dbde8a3c250743f8c094d7bccacb780a3e1d3aba764a936", kill_on_drop: false }`
[INFO] [stdout] e289bb0838be43f32dbde8a3c250743f8c094d7bccacb780a3e1d3aba764a936
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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-2026-03-05" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cad7c8aa4a4ecf020abfd0f567ea0955eb169f9afd24aad4352c752a22470a4c
[INFO] running `Command { std: "docker" "start" "-a" "cad7c8aa4a4ecf020abfd0f567ea0955eb169f9afd24aad4352c752a22470a4c", kill_on_drop: false }`
[INFO] [stderr]    Compiling flipflop v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.98s
[INFO] running `Command { std: "docker" "inspect" "cad7c8aa4a4ecf020abfd0f567ea0955eb169f9afd24aad4352c752a22470a4c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cad7c8aa4a4ecf020abfd0f567ea0955eb169f9afd24aad4352c752a22470a4c", kill_on_drop: false }`
[INFO] [stdout] cad7c8aa4a4ecf020abfd0f567ea0955eb169f9afd24aad4352c752a22470a4c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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-2026-03-05" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 21cf9d3b86b3269f408b723e2a9b53aeddc34044db08d4de27260623734bb830
[INFO] running `Command { std: "docker" "start" "-a" "21cf9d3b86b3269f408b723e2a9b53aeddc34044db08d4de27260623734bb830", kill_on_drop: false }`
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/flipflop-3c1153d5c12595c4)
[INFO] [stdout] 
[INFO] [stdout] running 14 tests
[INFO] [stdout] test error::tests::failed_empty_bwd_empty ... ok
[INFO] [stdout] test error::tests::failed_empty ... ok
[INFO] [stdout] test error::tests::failed_empty_fwd_empty ... ok
[INFO] [stdout] test error::tests::failed_nonempty_bwd_empty ... ok
[INFO] [stdout] test error::tests::failed_nonempty_bwd_nonempty ... ok
[INFO] [stdout] test error::tests::failed_empty_bwd_nonempty ... ok
[INFO] [stdout] test error::tests::failed_nonempty_fwd_empty ... ok
[INFO] [stdout] test error::tests::failed_empty_fwd_nonempty ... ok
[INFO] [stdout] test error::tests::failed_nonempty_fwd_nonempty ... ok
[INFO] [stdout] test suite::tests::consistent_weird_iterator ... ok
[INFO] [stdout] test suite::tests::inconsistent_empty ... ok
[INFO] [stdout] test suite::tests::simple_weird_iterator ... ok
[INFO] [stdout] test error::tests::failed_insert_bwd ... ok
[INFO] [stderr]    Doc-tests flipflop
[INFO] [stdout] test error::tests::failed_insert_fwd ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 14 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:16:18
[INFO] [stderr]    |
[INFO] [stderr] 16 | #![cfg_attr(doc, feature(doc_cfg))]
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 1 previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/beta-2026-03-05-x86_64-unknown-linux-gnu/bin/rustdoc --edition=2024 --crate-type lib --color auto --crate-name flipflop --test src/lib.rs --test-run-directory /opt/rustwide/workdir --deny=unsafe_op_in_unsafe_fn --warn=unreachable_pub '--warn=clippy::unnecessary_semicolon' '--deny=clippy::undocumented_unsafe_blocks' '--warn=clippy::std_instead_of_core' '--warn=clippy::std_instead_of_alloc' '--warn=clippy::semicolon_if_nothing_returned' '--warn=clippy::ref_as_ptr' '--warn=clippy::redundant_else' '--warn=clippy::redundant_closure_for_method_calls' '--warn=clippy::needless_raw_string_hashes' '--warn=clippy::needless_continue' '--allow=clippy::must_use_candidate' '--warn=clippy::missing_docs_in_private_items' --warn=missing_docs --warn=missing_debug_implementations '--warn=rustdoc::missing_crate_level_docs' '--warn=clippy::match_same_arms' '--warn=clippy::map_unwrap_or' '--warn=clippy::manual_is_power_of_two' '--warn=clippy::manual_assert' '--warn=clippy::inconsistent_struct_constructor' '--warn=clippy::ignored_unit_patterns' '--warn=clippy::if_not_else' '--warn=clippy::filter_map_next' '--warn=clippy::doc_markdown' '--warn=clippy::default_trait_access' '--warn=clippy::borrow_as_ptr' '--warn=clippy::alloc_instead_of_core' --extern flipflop=/opt/rustwide/target/debug/deps/libflipflop-430490ef54a0ea47.rlib --extern rand=/opt/rustwide/target/debug/deps/librand-1c5624420f7742e4.rlib -L dependency=/opt/rustwide/target/debug/deps -C embed-bitcode=no --cfg 'feature="alloc"' --cfg 'feature="default"' --cfg 'feature="rand"' --cfg 'feature="std"' --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("alloc", "default", "nightly", "rand", "std"))' --cap-lints=warn --error-format human` (exit status: 1)
[INFO] [stderr] note: test exited abnormally; to see the full output pass --no-capture to the harness.
[INFO] running `Command { std: "docker" "inspect" "21cf9d3b86b3269f408b723e2a9b53aeddc34044db08d4de27260623734bb830", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "21cf9d3b86b3269f408b723e2a9b53aeddc34044db08d4de27260623734bb830", kill_on_drop: false }`
[INFO] [stdout] 21cf9d3b86b3269f408b723e2a9b53aeddc34044db08d4de27260623734bb830
