[INFO] fetching crate hax-rust-engine 0.3.4...
[INFO] testing hax-rust-engine-0.3.4 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate hax-rust-engine 0.3.4 into /workspace/builds/worker-3-tc2/source
[INFO] started tweaking crates.io crate hax-rust-engine 0.3.4
[INFO] finished tweaking crates.io crate hax-rust-engine 0.3.4
[INFO] tweaked toml for crates.io crate hax-rust-engine 0.3.4 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate hax-rust-engine 0.3.4 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 hax-rust-engine 0.3.4 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-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 7e1ab11eae02267be9e1751b505a2c1bd7016ff747f4785d96d1aceef973004c
[INFO] running `Command { std: "docker" "start" "-a" "7e1ab11eae02267be9e1751b505a2c1bd7016ff747f4785d96d1aceef973004c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7e1ab11eae02267be9e1751b505a2c1bd7016ff747f4785d96d1aceef973004c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7e1ab11eae02267be9e1751b505a2c1bd7016ff747f4785d96d1aceef973004c", kill_on_drop: false }`
[INFO] [stdout] 7e1ab11eae02267be9e1751b505a2c1bd7016ff747f4785d96d1aceef973004c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] b545e80bd8f2762774cc17ec402ad46453f1bcfc8d21f4d7d2969e592ad1f555
[INFO] running `Command { std: "docker" "start" "-a" "b545e80bd8f2762774cc17ec402ad46453f1bcfc8d21f4d7d2969e592ad1f555", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.174
[INFO] [stderr]    Compiling serde_json v1.0.141
[INFO] [stderr]    Compiling anstyle v1.0.11
[INFO] [stderr]    Compiling schemars v0.8.22
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling itertools v0.11.0
[INFO] [stderr]    Compiling anstyle-parse v0.2.7
[INFO] [stderr]    Compiling anstyle-query v1.1.3
[INFO] [stderr]    Compiling colorchoice v1.0.4
[INFO] [stderr]    Compiling zstd-safe v7.2.4
[INFO] [stderr]    Compiling dyn-clone v1.0.20
[INFO] [stderr]    Compiling syn v2.0.104
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling clap_lex v0.7.5
[INFO] [stderr]    Compiling itertools v0.13.0
[INFO] [stderr]    Compiling hax-types v0.3.4
[INFO] [stderr]    Compiling camino v1.1.11
[INFO] [stderr]    Compiling colored v2.2.0
[INFO] [stderr]    Compiling annotate-snippets v0.11.5
[INFO] [stderr]    Compiling arrayvec v0.5.2
[INFO] [stderr]    Compiling typed-arena v2.0.2
[INFO] [stderr]    Compiling path-clean v1.0.1
[INFO] [stderr]    Compiling anstream v0.6.19
[INFO] [stderr]    Compiling clap_builder v4.5.42
[INFO] [stderr]    Compiling pretty v0.12.4
[INFO] [stderr]    Compiling jobserver v0.1.33
[INFO] [stderr]    Compiling cc v1.2.30
[INFO] [stderr]    Compiling zstd-sys v2.0.15+zstd.1.5.7
[INFO] [stderr]    Compiling psm v0.1.26
[INFO] [stderr]    Compiling stacker v0.1.21
[INFO] [stderr]    Compiling ext-trait-proc_macros v1.0.1
[INFO] [stderr]    Compiling hax-adt-into v0.3.4
[INFO] [stderr]    Compiling serde_derive_internals v0.29.1
[INFO] [stderr]    Compiling darling_core v0.20.11
[INFO] [stderr]    Compiling ext-trait v1.0.1
[INFO] [stderr]    Compiling extension-traits v1.0.1
[INFO] [stderr]    Compiling serde_derive v1.0.219
[INFO] [stderr]    Compiling tracing-attributes v0.1.30
[INFO] [stderr]    Compiling clap_derive v4.5.41
[INFO] [stderr]    Compiling miette-derive v7.6.0
[INFO] [stderr]    Compiling hax-rust-engine-macros v0.3.4
[INFO] [stderr]    Compiling schemars_derive v0.8.22
[INFO] [stderr]    Compiling tracing v0.1.41
[INFO] [stderr]    Compiling miette v7.6.0
[INFO] [stderr]    Compiling darling_macro v0.20.11
[INFO] [stderr]    Compiling zstd v0.13.3
[INFO] [stderr]    Compiling darling v0.20.11
[INFO] [stderr]    Compiling clap v4.5.42
[INFO] [stderr]    Compiling derive_generic_visitor_macros v0.3.0
[INFO] [stderr]    Compiling derive_generic_visitor v0.3.0
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]    Compiling serde-brief v0.1.1
[INFO] [stderr]    Compiling serde_stacker v0.1.12
[INFO] [stderr]    Compiling serde-jsonlines v0.5.0
[INFO] [stderr]    Compiling hax-frontend-exporter-options v0.3.4
[INFO] [stderr]    Compiling hax-frontend-exporter v0.3.4
[INFO] [stderr]    Compiling hax-rust-engine v0.3.4 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(rustc_private)]
[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 `hax-rust-engine` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "b545e80bd8f2762774cc17ec402ad46453f1bcfc8d21f4d7d2969e592ad1f555", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b545e80bd8f2762774cc17ec402ad46453f1bcfc8d21f4d7d2969e592ad1f555", kill_on_drop: false }`
[INFO] [stdout] b545e80bd8f2762774cc17ec402ad46453f1bcfc8d21f4d7d2969e592ad1f555