[INFO] fetching crate ytree 0.1.33...
[INFO] testing ytree-0.1.33 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate ytree 0.1.33 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate ytree 0.1.33
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate ytree 0.1.33
[INFO] tweaked toml for crates.io crate ytree 0.1.33 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate ytree 0.1.33 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 ytree 0.1.33 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-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7f5a5752ba6a9d70ee86aab116d7729fc7035a699d2d9fa96c7c782436887760
[INFO] running `Command { std: "docker" "start" "-a" "7f5a5752ba6a9d70ee86aab116d7729fc7035a699d2d9fa96c7c782436887760", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7f5a5752ba6a9d70ee86aab116d7729fc7035a699d2d9fa96c7c782436887760", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7f5a5752ba6a9d70ee86aab116d7729fc7035a699d2d9fa96c7c782436887760", kill_on_drop: false }`
[INFO] [stdout] 7f5a5752ba6a9d70ee86aab116d7729fc7035a699d2d9fa96c7c782436887760
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 943cecec3d00a20e8adc110629a89537979901fdb171ebb893956c6c9128383b
[INFO] running `Command { std: "docker" "start" "-a" "943cecec3d00a20e8adc110629a89537979901fdb171ebb893956c6c9128383b", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.95
[INFO] [stderr]    Compiling tsfmt v0.1.10
[INFO] [stderr]    Compiling anyhow v1.0.98
[INFO] [stderr]    Compiling aok v0.1.17
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]    Compiling syn v2.0.104
[INFO] [stderr]    Compiling serde_derive v1.0.219
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]    Compiling indexmap v2.10.0
[INFO] [stderr]    Compiling serde_yaml v0.9.34+deprecated
[INFO] [stderr]    Compiling ytree v0.1.33 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(str_split_remainder)]
[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 `ytree` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "943cecec3d00a20e8adc110629a89537979901fdb171ebb893956c6c9128383b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "943cecec3d00a20e8adc110629a89537979901fdb171ebb893956c6c9128383b", kill_on_drop: false }`
[INFO] [stdout] 943cecec3d00a20e8adc110629a89537979901fdb171ebb893956c6c9128383b
