[INFO] fetching crate playback-rs 0.4.4...
[INFO] testing playback-rs-0.4.4 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate playback-rs 0.4.4 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate playback-rs 0.4.4
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate playback-rs 0.4.4
[INFO] tweaked toml for crates.io crate playback-rs 0.4.4 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate playback-rs 0.4.4 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] crate crates.io crate playback-rs 0.4.4 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-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] 12818b68436f70747a4c9c8fe5dcbb56fc71342fdde94ce61c23f4224963fe91
[INFO] running `Command { std: "docker" "start" "-a" "12818b68436f70747a4c9c8fe5dcbb56fc71342fdde94ce61c23f4224963fe91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "12818b68436f70747a4c9c8fe5dcbb56fc71342fdde94ce61c23f4224963fe91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "12818b68436f70747a4c9c8fe5dcbb56fc71342fdde94ce61c23f4224963fe91", kill_on_drop: false }`
[INFO] [stdout] 12818b68436f70747a4c9c8fe5dcbb56fc71342fdde94ce61c23f4224963fe91
[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] dd6c07019b104ef06014e1cc3ab55bc3edd0aae15a44b20bc23945646c4ffa25
[INFO] running `Command { std: "docker" "start" "-a" "dd6c07019b104ef06014e1cc3ab55bc3edd0aae15a44b20bc23945646c4ffa25", kill_on_drop: false }`
[INFO] [stderr]    Compiling lazy_static v1.5.0
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling bitflags v1.3.2
[INFO] [stderr]    Compiling arrayvec v0.7.4
[INFO] [stderr]    Compiling bytemuck v1.16.1
[INFO] [stderr]    Compiling log v0.4.22
[INFO] [stderr]    Compiling autocfg v1.3.0
[INFO] [stderr]    Compiling once_cell v1.19.0
[INFO] [stderr]    Compiling libc v0.2.155
[INFO] [stderr]    Compiling encoding_rs v0.8.34
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling tracing-core v0.1.32
[INFO] [stderr]    Compiling pkg-config v0.3.30
[INFO] [stderr]    Compiling thread_local v1.1.8
[INFO] [stderr]    Compiling symphonia-core v0.5.4
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling rustfft v6.2.0
[INFO] [stderr]    Compiling sharded-slab v0.1.7
[INFO] [stderr]    Compiling cc v1.1.4
[INFO] [stderr]    Compiling alsa-sys v0.3.1
[INFO] [stderr]    Compiling pin-project-lite v0.2.14
[INFO] [stderr]    Compiling strength_reduce v0.2.4
[INFO] [stderr]    Compiling tracing v0.1.40
[INFO] [stderr]    Compiling eyre v0.6.12
[INFO] [stderr]    Compiling gimli v0.28.1
[INFO] [stderr]    Compiling memchr v2.7.4
[INFO] [stderr]    Compiling tracing-subscriber v0.3.18
[INFO] [stderr]    Compiling adler v1.0.2
[INFO] [stderr]    Compiling miniz_oxide v0.7.4
[INFO] [stderr]    Compiling num-integer v0.1.46
[INFO] [stderr]    Compiling symphonia-metadata v0.5.4
[INFO] [stderr]    Compiling primal-check v0.3.4
[INFO] [stderr]    Compiling transpose v0.2.3
[INFO] [stderr]    Compiling num-complex v0.4.6
[INFO] [stderr]    Compiling object v0.32.2
[INFO] [stderr]    Compiling backtrace v0.3.71
[INFO] [stderr]    Compiling symphonia-utils-xiph v0.5.4
[INFO] [stderr]    Compiling rustc-demangle v0.1.24
[INFO] [stderr]    Compiling tracing-error v0.2.0
[INFO] [stderr]    Compiling cpal v0.15.3
[INFO] [stderr]    Compiling extended v0.1.0
[INFO] [stderr]    Compiling indenter v0.3.3
[INFO] [stderr]    Compiling bitflags v2.6.0
[INFO] [stderr]    Compiling owo-colors v3.5.0
[INFO] [stderr]    Compiling alsa v0.9.0
[INFO] [stderr]    Compiling symphonia-format-riff v0.5.4
[INFO] [stderr]    Compiling symphonia-format-isomp4 v0.5.4
[INFO] [stderr]    Compiling symphonia-format-ogg v0.5.4
[INFO] [stderr]    Compiling symphonia-codec-vorbis v0.5.4
[INFO] [stderr]    Compiling addr2line v0.21.0
[INFO] [stderr]    Compiling color-spantrace v0.2.1
[INFO] [stderr]    Compiling symphonia-bundle-flac v0.5.4
[INFO] [stderr]    Compiling symphonia-format-mkv v0.5.4
[INFO] [stderr]    Compiling symphonia-bundle-mp3 v0.5.4
[INFO] [stderr]    Compiling symphonia-codec-alac v0.5.4
[INFO] [stderr]    Compiling symphonia-codec-adpcm v0.5.4
[INFO] [stderr]    Compiling symphonia-codec-pcm v0.5.4
[INFO] [stderr]    Compiling symphonia-codec-aac v0.5.4
[INFO] [stderr]    Compiling dasp_sample v0.11.0
[INFO] [stderr]    Compiling symphonia v0.5.4
[INFO] [stderr]    Compiling color-eyre v0.6.3
[INFO] [stderr]    Compiling realfft v3.3.0
[INFO] [stderr]    Compiling rubato v0.12.0
[INFO] [stderr]    Compiling playback-rs v0.4.4 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(c_variadic)]
[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 `playback-rs` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "dd6c07019b104ef06014e1cc3ab55bc3edd0aae15a44b20bc23945646c4ffa25", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dd6c07019b104ef06014e1cc3ab55bc3edd0aae15a44b20bc23945646c4ffa25", kill_on_drop: false }`
[INFO] [stdout] dd6c07019b104ef06014e1cc3ab55bc3edd0aae15a44b20bc23945646c4ffa25