[INFO] fetching crate to_snake_case 0.1.1...
[INFO] testing to_snake_case-0.1.1 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate to_snake_case 0.1.1 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate to_snake_case 0.1.1
[INFO] finished tweaking crates.io crate to_snake_case 0.1.1
[INFO] tweaked toml for crates.io crate to_snake_case 0.1.1 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate to_snake_case 0.1.1 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 44b83670c2f14210cf40c502cc7438f540ced9a804b58442643c4643cce36e8d
[INFO] running `Command { std: "docker" "start" "-a" "44b83670c2f14210cf40c502cc7438f540ced9a804b58442643c4643cce36e8d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "44b83670c2f14210cf40c502cc7438f540ced9a804b58442643c4643cce36e8d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "44b83670c2f14210cf40c502cc7438f540ced9a804b58442643c4643cce36e8d", kill_on_drop: false }`
[INFO] [stdout] 44b83670c2f14210cf40c502cc7438f540ced9a804b58442643c4643cce36e8d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 596e9ed3e3d7567cb3710b8d6684aa4b4fa799439c1ad6d1d9877c0a9d15c8a0
[INFO] running `Command { std: "docker" "start" "-a" "596e9ed3e3d7567cb3710b8d6684aa4b4fa799439c1ad6d1d9877c0a9d15c8a0", kill_on_drop: false }`
[INFO] [stderr]    Compiling to_snake_case v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr] error: could not compile `to_snake_case` (lib) due to 4 previous errors; 1 warning emitted
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]   --> src/lib.rs:58:20
[INFO] [stdout]    |
[INFO] [stdout] 58 |                 if let Some((false, c3)) = n3
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]   --> src/lib.rs:59:20
[INFO] [stdout]    |
[INFO] [stdout] 59 |                 && let Some((false, c2)) = n2
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]   --> src/lib.rs:70:20
[INFO] [stdout]    |
[INFO] [stdout] 70 |                 if let Some((true, _)) = n2 && n1.1.is_uppercase() {
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:31:1
[INFO] [stdout]    |
[INFO] [stdout] 31 | #![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] warning: the feature `let_chains` has been stable since 1.88.0 and no longer requires an attribute to enable
[INFO] [stdout]   --> src/lib.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 | #![feature(let_chains)]
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "596e9ed3e3d7567cb3710b8d6684aa4b4fa799439c1ad6d1d9877c0a9d15c8a0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "596e9ed3e3d7567cb3710b8d6684aa4b4fa799439c1ad6d1d9877c0a9d15c8a0", kill_on_drop: false }`
[INFO] [stdout] 596e9ed3e3d7567cb3710b8d6684aa4b4fa799439c1ad6d1d9877c0a9d15c8a0