[INFO] fetching crate generic_trait_alias 0.1.2...
[INFO] testing generic_trait_alias-0.1.2 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate generic_trait_alias 0.1.2 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate generic_trait_alias 0.1.2
[INFO] finished tweaking crates.io crate generic_trait_alias 0.1.2
[INFO] tweaked toml for crates.io crate generic_trait_alias 0.1.2 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate generic_trait_alias 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] 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] f198bc3d452af1b1dca456b1d3123e267f7b21cf2a0f27c35096807d562e9513
[INFO] running `Command { std: "docker" "start" "-a" "f198bc3d452af1b1dca456b1d3123e267f7b21cf2a0f27c35096807d562e9513", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f198bc3d452af1b1dca456b1d3123e267f7b21cf2a0f27c35096807d562e9513", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f198bc3d452af1b1dca456b1d3123e267f7b21cf2a0f27c35096807d562e9513", kill_on_drop: false }`
[INFO] [stdout] f198bc3d452af1b1dca456b1d3123e267f7b21cf2a0f27c35096807d562e9513
[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] 2e3c41a50261a6d574fd88caa75607bda894c9a159f24d0b41f2a7e2b6e01a01
[INFO] running `Command { std: "docker" "start" "-a" "2e3c41a50261a6d574fd88caa75607bda894c9a159f24d0b41f2a7e2b6e01a01", kill_on_drop: false }`
[INFO] [stderr]    Compiling generic_trait_alias v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]   --> src/parser.rs:65:23
[INFO] [stdout]    |
[INFO] [stdout] 65 |                 while let Token::Colon = self.items[i + 1] && let Token::Ident(ident2) = &self.items[i + 2]{
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]   --> src/parser.rs:65:63
[INFO] [stdout]    |
[INFO] [stdout] 65 |                 while let Token::Colon = self.items[i + 1] && let Token::Ident(ident2) = &self.items[i + 2]{
[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: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] 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:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![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] [stderr] error: could not compile `generic_trait_alias` (lib) due to 3 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "2e3c41a50261a6d574fd88caa75607bda894c9a159f24d0b41f2a7e2b6e01a01", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2e3c41a50261a6d574fd88caa75607bda894c9a159f24d0b41f2a7e2b6e01a01", kill_on_drop: false }`
[INFO] [stdout] 2e3c41a50261a6d574fd88caa75607bda894c9a159f24d0b41f2a7e2b6e01a01