[INFO] fetching crate mvlogger 0.4.0...
[INFO] testing mvlogger-0.4.0 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate mvlogger 0.4.0 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate mvlogger 0.4.0
[INFO] finished tweaking crates.io crate mvlogger 0.4.0
[INFO] tweaked toml for crates.io crate mvlogger 0.4.0 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate mvlogger 0.4.0 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 mvlogger 0.4.0 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-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-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 459776ca37c124698178c24133bb310605cd6a4688c8766428b81c9b829a61ca
[INFO] running `Command { std: "docker" "start" "-a" "459776ca37c124698178c24133bb310605cd6a4688c8766428b81c9b829a61ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "459776ca37c124698178c24133bb310605cd6a4688c8766428b81c9b829a61ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "459776ca37c124698178c24133bb310605cd6a4688c8766428b81c9b829a61ca", kill_on_drop: false }`
[INFO] [stdout] 459776ca37c124698178c24133bb310605cd6a4688c8766428b81c9b829a61ca
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 9dc8cf1b1f6610606e01c45b1f061f3ca1797e29935a476c04f8877292b8a7de
[INFO] running `Command { std: "docker" "start" "-a" "9dc8cf1b1f6610606e01c45b1f061f3ca1797e29935a476c04f8877292b8a7de", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.169
[INFO] [stderr]    Compiling foldhash v0.1.4
[INFO] [stderr]    Compiling bytebuffer v2.3.0
[INFO] [stderr]    Compiling log v0.4.25
[INFO] [stderr]    Compiling syn v2.0.96
[INFO] [stderr]    Compiling hashbrown v0.15.2
[INFO] [stderr]    Compiling parking_lot_core v0.9.10
[INFO] [stderr]    Compiling parking_lot v0.12.3
[INFO] [stderr]    Compiling mvutils-proc-macro v1.0.2
[INFO] [stderr]    Compiling mvutils v1.1.7
[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/mvutils-1.1.7/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(array_try_from_fn)]
[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 `mvutils` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "9dc8cf1b1f6610606e01c45b1f061f3ca1797e29935a476c04f8877292b8a7de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9dc8cf1b1f6610606e01c45b1f061f3ca1797e29935a476c04f8877292b8a7de", kill_on_drop: false }`
[INFO] [stdout] 9dc8cf1b1f6610606e01c45b1f061f3ca1797e29935a476c04f8877292b8a7de