[INFO] fetching crate pycc-rs 0.0.4...
[INFO] testing pycc-rs-0.0.4 against beta-2025-10-28 for beta-1.92-2
[INFO] extracting crate pycc-rs 0.0.4 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate pycc-rs 0.0.4
[INFO] finished tweaking crates.io crate pycc-rs 0.0.4
[INFO] tweaked toml for crates.io crate pycc-rs 0.0.4 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate pycc-rs 0.0.4 on toolchain beta-2025-10-28
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-10-28" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate pycc-rs 0.0.4 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-2025-10-28" "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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 20aa1015e333a8b881b897695cc19ea957c3768c928fc013f550f23697bd1633
[INFO] running `Command { std: "docker" "start" "-a" "20aa1015e333a8b881b897695cc19ea957c3768c928fc013f550f23697bd1633", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "20aa1015e333a8b881b897695cc19ea957c3768c928fc013f550f23697bd1633", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "20aa1015e333a8b881b897695cc19ea957c3768c928fc013f550f23697bd1633", kill_on_drop: false }`
[INFO] [stdout] 20aa1015e333a8b881b897695cc19ea957c3768c928fc013f550f23697bd1633
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9650e3156cb1856052e0e9e8b1fca30e17b294054ea08bc9a1a37de35cd95a4d
[INFO] running `Command { std: "docker" "start" "-a" "9650e3156cb1856052e0e9e8b1fca30e17b294054ea08bc9a1a37de35cd95a4d", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.88
[INFO] [stderr]    Compiling semver v1.0.23
[INFO] [stderr]    Compiling anyhow v1.0.89
[INFO] [stderr]    Compiling crossbeam-utils v0.8.20
[INFO] [stderr]    Compiling regex-lite v0.1.6
[INFO] [stderr]    Compiling libc v0.2.160
[INFO] [stderr]    Compiling either v1.13.0
[INFO] [stderr]    Compiling thiserror v1.0.64
[INFO] [stderr]    Compiling inkwell v0.5.0
[INFO] [stderr]    Compiling colored v2.1.0
[INFO] [stderr]    Compiling base32 v0.5.1
[INFO] [stderr]    Compiling terl v0.0.3
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.18
[INFO] [stderr]    Compiling crossbeam-deque v0.8.5
[INFO] [stderr]    Compiling llvm-sys v180.0.0
[INFO] [stderr]    Compiling quote v1.0.37
[INFO] [stderr]    Compiling rayon-core v1.12.1
[INFO] [stderr]    Compiling syn v2.0.79
[INFO] [stderr]    Compiling rayon v1.10.0
[INFO] [stderr]    Compiling serde_derive v1.0.210
[INFO] [stderr]    Compiling thiserror-impl v1.0.64
[INFO] [stderr]    Compiling inkwell_internals v0.10.0
[INFO] [stderr]    Compiling clap_derive v4.5.18
[INFO] [stderr]    Compiling clap v4.5.20
[INFO] [stderr]    Compiling serde v1.0.210
[INFO] [stderr]    Compiling py-lex v0.0.3
[INFO] [stderr]    Compiling serde_json v1.0.128
[INFO] [stderr]    Compiling py-ir v0.0.4
[INFO] [stderr]    Compiling py-codegen v0.0.4
[INFO] [stderr]    Compiling py-declare v0.0.4
[INFO] [stderr]    Compiling py-codegen-c v0.0.4
[INFO] [stderr]    Compiling py-codegen-llvm v0.0.4
[INFO] [stderr]    Compiling py-ast v0.0.4
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/py-ast-0.0.4/src/parse/expr.rs:300:28
[INFO] [stdout]     |
[INFO] [stdout] 300 |                         && let Some(rb) = p.r#match(RPU(Operators::BracketR)).apply(mapper::Try)?
[INFO] [stdout]     |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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/py-ast-0.0.4/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(let_chains)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `let_chains` has been stable since `1.88.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `py-ast` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "9650e3156cb1856052e0e9e8b1fca30e17b294054ea08bc9a1a37de35cd95a4d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9650e3156cb1856052e0e9e8b1fca30e17b294054ea08bc9a1a37de35cd95a4d", kill_on_drop: false }`
[INFO] [stdout] 9650e3156cb1856052e0e9e8b1fca30e17b294054ea08bc9a1a37de35cd95a4d