[INFO] fetching crate wtx-ui 0.2.2...
[INFO] testing wtx-ui-0.2.2 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate wtx-ui 0.2.2 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate wtx-ui 0.2.2
[INFO] finished tweaking crates.io crate wtx-ui 0.2.2
[INFO] tweaked toml for crates.io crate wtx-ui 0.2.2 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate wtx-ui 0.2.2 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 wtx-ui 0.2.2 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-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 1c0e8ff1192d00b5dce6a455ee2b205f022dd7f08545c4ad07d2233ab002f0ea
[INFO] running `Command { std: "docker" "start" "-a" "1c0e8ff1192d00b5dce6a455ee2b205f022dd7f08545c4ad07d2233ab002f0ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1c0e8ff1192d00b5dce6a455ee2b205f022dd7f08545c4ad07d2233ab002f0ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1c0e8ff1192d00b5dce6a455ee2b205f022dd7f08545c4ad07d2233ab002f0ea", kill_on_drop: false }`
[INFO] [stdout] 1c0e8ff1192d00b5dce6a455ee2b205f022dd7f08545c4ad07d2233ab002f0ea
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 160833bfa78921186c432fcc2bb4f6285b742525cc4c0ce2062496b406f124d6
[INFO] running `Command { std: "docker" "start" "-a" "160833bfa78921186c432fcc2bb4f6285b742525cc4c0ce2062496b406f124d6", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.185
[INFO] [stderr]    Compiling mio v1.2.0
[INFO] [stderr]    Compiling socket2 v0.6.3
[INFO] [stderr]    Compiling tokio v1.52.1
[INFO] [stderr]    Compiling wtx v0.44.3
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/wtx-0.44.3/src/lib.rs:5:34
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![cfg_attr(feature = "nightly", feature(random, return_type_notation))]
[INFO] [stdout]   |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `wtx` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "160833bfa78921186c432fcc2bb4f6285b742525cc4c0ce2062496b406f124d6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "160833bfa78921186c432fcc2bb4f6285b742525cc4c0ce2062496b406f124d6", kill_on_drop: false }`
[INFO] [stdout] 160833bfa78921186c432fcc2bb4f6285b742525cc4c0ce2062496b406f124d6
