[INFO] fetching crate langram_train 0.1.2...
[INFO] testing langram_train-0.1.2 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate langram_train 0.1.2 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate langram_train 0.1.2
[INFO] finished tweaking crates.io crate langram_train 0.1.2
[INFO] tweaked toml for crates.io crate langram_train 0.1.2 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate langram_train 0.1.2 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 langram_train 0.1.2 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-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-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 34f307791d4edb8c66e1a8cf82bb82a0d096e28aab328cead464baeab8603446
[INFO] running `Command { std: "docker" "start" "-a" "34f307791d4edb8c66e1a8cf82bb82a0d096e28aab328cead464baeab8603446", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "34f307791d4edb8c66e1a8cf82bb82a0d096e28aab328cead464baeab8603446", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "34f307791d4edb8c66e1a8cf82bb82a0d096e28aab328cead464baeab8603446", kill_on_drop: false }`
[INFO] [stdout] 34f307791d4edb8c66e1a8cf82bb82a0d096e28aab328cead464baeab8603446
[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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 397eee87718afd0ff1c975823e4ac9ccb90bfc802283d46ce9fb4540434e30dd
[INFO] running `Command { std: "docker" "start" "-a" "397eee87718afd0ff1c975823e4ac9ccb90bfc802283d46ce9fb4540434e30dd", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.172
[INFO] [stderr]    Compiling getrandom v0.3.3
[INFO] [stderr]    Compiling zerocopy v0.8.25
[INFO] [stderr]    Compiling rustversion v1.0.21
[INFO] [stderr]    Compiling crossbeam-utils v0.8.21
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]    Compiling smallvec v1.15.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.95
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling ahash v0.8.12
[INFO] [stderr]    Compiling once_cell v1.21.3
[INFO] [stderr]    Compiling alloc-no-stdlib v2.0.4
[INFO] [stderr]    Compiling arraystring v0.3.0
[INFO] [stderr]    Compiling rayon-core v1.12.1
[INFO] [stderr]    Compiling anstyle-parse v0.2.6
[INFO] [stderr]    Compiling either v1.15.0
[INFO] [stderr]    Compiling alloc-stdlib v0.2.2
[INFO] [stderr]    Compiling utf16_iter v1.0.5
[INFO] [stderr]    Compiling anstyle-query v1.1.2
[INFO] [stderr]    Compiling write16 v1.0.0
[INFO] [stderr]    Compiling colorchoice v1.0.3
[INFO] [stderr]    Compiling anstyle v1.0.10
[INFO] [stderr]    Compiling brotli-decompressor v5.0.0
[INFO] [stderr]    Compiling tracing-core v0.1.33
[INFO] [stderr]    Compiling concat_const v0.2.0
[INFO] [stderr]    Compiling clap_lex v0.7.4
[INFO] [stderr]    Compiling static_assertions v1.1.0
[INFO] [stderr]    Compiling strum v0.27.1
[INFO] [stderr]    Compiling atoi_simd v0.16.0
[INFO] [stderr]    Compiling itertools v0.14.0
[INFO] [stderr]    Compiling rustc-hash v2.1.1
[INFO] [stderr]    Compiling arrayvec v0.7.6
[INFO] [stderr]    Compiling anstream v0.6.18
[INFO] [stderr]    Compiling cap v0.1.2
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]    Compiling syn v2.0.101
[INFO] [stderr]    Compiling include_dir_macros v0.7.4
[INFO] [stderr]    Compiling clap_builder v4.5.39
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.18
[INFO] [stderr]    Compiling castaway v0.2.3
[INFO] [stderr]    Compiling compact_str v0.9.0
[INFO] [stderr]    Compiling include_dir v0.7.4
[INFO] [stderr]    Compiling langram_models v0.0.1
[INFO] [stderr]    Compiling brotli v8.0.1
[INFO] [stderr]    Compiling crossbeam-deque v0.8.6
[INFO] [stderr]    Compiling parking_lot_core v0.9.10
[INFO] [stderr]    Compiling num_cpus v1.16.0
[INFO] [stderr]    Compiling threadpool v1.8.1
[INFO] [stderr]    Compiling num-integer v0.1.46
[INFO] [stderr]    Compiling num-complex v0.4.6
[INFO] [stderr]    Compiling parking_lot v0.12.3
[INFO] [stderr]    Compiling num-bigint v0.4.6
[INFO] [stderr]    Compiling num-iter v0.1.45
[INFO] [stderr]    Compiling rayon v1.10.0
[INFO] [stderr]    Compiling debug_unsafe v0.1.3
[INFO] [stderr]    Compiling num-rational v0.4.2
[INFO] [stderr]    Compiling num v0.4.3
[INFO] [stderr]    Compiling fraction v0.15.3
[INFO] [stderr]    Compiling synstructure v0.13.2
[INFO] [stderr]    Compiling zerofrom-derive v0.1.6
[INFO] [stderr]    Compiling displaydoc v0.2.5
[INFO] [stderr]    Compiling yoke-derive v0.8.0
[INFO] [stderr]    Compiling zerovec-derive v0.11.1
[INFO] [stderr]    Compiling serde_derive v1.0.219
[INFO] [stderr]    Compiling tracing-attributes v0.1.28
[INFO] [stderr]    Compiling alphabet_detector_macros v0.5.1
[INFO] [stderr]    Compiling strum_macros v0.27.1
[INFO] [stderr]    Compiling clap_derive v4.5.32
[INFO] [stderr]    Compiling tinystr v0.8.1
[INFO] [stderr]    Compiling zerotrie v0.2.2
[INFO] [stderr]    Compiling zerofrom v0.1.6
[INFO] [stderr]    Compiling yoke v0.8.0
[INFO] [stderr]    Compiling icu_locale_core v2.0.0
[INFO] [stderr]    Compiling zerovec v0.11.2
[INFO] [stderr]    Compiling tracing v0.1.41
[INFO] [stderr]    Compiling potential_utf v0.1.2
[INFO] [stderr]    Compiling icu_provider v2.0.0
[INFO] [stderr]    Compiling icu_collections v2.0.0
[INFO] [stderr]    Compiling clap v4.5.39
[INFO] [stderr]    Compiling icu_normalizer v2.0.0
[INFO] [stderr]    Compiling serde_map v0.2.0
[INFO] [stderr]    Compiling alphabet_detector v0.8.0
[INFO] [stderr]    Compiling serde_encom v0.3.4
[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/alphabet_detector-0.8.0/src/lib.rs:37:37
[INFO] [stdout]    |
[INFO] [stdout] 37 | #![cfg_attr(feature = "files_read", feature(string_into_chars))]
[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 `alphabet_detector` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "397eee87718afd0ff1c975823e4ac9ccb90bfc802283d46ce9fb4540434e30dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "397eee87718afd0ff1c975823e4ac9ccb90bfc802283d46ce9fb4540434e30dd", kill_on_drop: false }`
[INFO] [stdout] 397eee87718afd0ff1c975823e4ac9ccb90bfc802283d46ce9fb4540434e30dd