[INFO] fetching crate submerger 0.2.0...
[INFO] testing submerger-0.2.0 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate submerger 0.2.0 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate submerger 0.2.0
[INFO] finished tweaking crates.io crate submerger 0.2.0
[INFO] tweaked toml for crates.io crate submerger 0.2.0 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate submerger 0.2.0 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 submerger 0.2.0 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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] d96c81cdb0c00160f6e6219d64ce2e50dd3f0232438b613ca684b5c86ffd3c20
[INFO] running `Command { std: "docker" "start" "-a" "d96c81cdb0c00160f6e6219d64ce2e50dd3f0232438b613ca684b5c86ffd3c20", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d96c81cdb0c00160f6e6219d64ce2e50dd3f0232438b613ca684b5c86ffd3c20", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d96c81cdb0c00160f6e6219d64ce2e50dd3f0232438b613ca684b5c86ffd3c20", kill_on_drop: false }`
[INFO] [stdout] d96c81cdb0c00160f6e6219d64ce2e50dd3f0232438b613ca684b5c86ffd3c20
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 03f13d5271a6e509d1c9c637c6ca26083178e79621e5bcad014eeb82663bbb7b
[INFO] running `Command { std: "docker" "start" "-a" "03f13d5271a6e509d1c9c637c6ca26083178e79621e5bcad014eeb82663bbb7b", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.86
[INFO] [stderr]    Compiling unicode-ident v1.0.13
[INFO] [stderr]    Compiling libc v0.2.158
[INFO] [stderr]    Compiling anstyle v1.0.8
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling anstyle-parse v0.2.5
[INFO] [stderr]    Compiling thiserror v1.0.63
[INFO] [stderr]    Compiling peg-runtime v0.8.3
[INFO] [stderr]    Compiling colorchoice v1.0.2
[INFO] [stderr]    Compiling anstyle-query v1.1.1
[INFO] [stderr]    Compiling time-macros v0.2.18
[INFO] [stderr]    Compiling clap_lex v0.7.2
[INFO] [stderr]    Compiling num_threads v0.1.7
[INFO] [stderr]    Compiling anstream v0.6.15
[INFO] [stderr]    Compiling anyhow v1.0.89
[INFO] [stderr]    Compiling regex-syntax v0.8.4
[INFO] [stderr]    Compiling clap_builder v4.5.17
[INFO] [stderr]    Compiling colored v2.1.0
[INFO] [stderr]    Compiling quote v1.0.37
[INFO] [stderr]    Compiling chrono v0.4.41
[INFO] [stderr]    Compiling syn v2.0.77
[INFO] [stderr]    Compiling peg-macros v0.8.4
[INFO] [stderr]    Compiling time v0.3.36
[INFO] [stderr]    Compiling simple_logger v5.0.0
[INFO] [stderr]    Compiling peg v0.8.4
[INFO] [stderr]    Compiling regex-automata v0.4.7
[INFO] [stderr]    Compiling thiserror-impl v1.0.63
[INFO] [stderr]    Compiling clap_derive v4.5.13
[INFO] [stderr]    Compiling regex v1.10.6
[INFO] [stderr]    Compiling subtp v0.2.0
[INFO] [stderr]    Compiling clap v4.5.17
[INFO] [stderr]    Compiling submerger v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]    --> src/main.rs:329:24
[INFO] [stdout]     |
[INFO] [stdout] 329 |                     if let Some(s1) = l1
[INFO] [stdout]     |                        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]    --> src/main.rs:330:28
[INFO] [stdout]     |
[INFO] [stdout] 330 |                         && let Some(s2) = l2
[INFO] [stdout]     |                            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]   --> src/merge.rs:80:20
[INFO] [stdout]    |
[INFO] [stdout] 80 |                 && let Some(file_name) = file_path.file_name().and_then(|n| n.to_str())
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]   --> src/merge.rs:81:20
[INFO] [stdout]    |
[INFO] [stdout] 81 |                 && let Some(captures) = subtitle_pattern.captures(file_name)
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.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/main.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 `submerger` (bin "submerger") due to 5 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "03f13d5271a6e509d1c9c637c6ca26083178e79621e5bcad014eeb82663bbb7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "03f13d5271a6e509d1c9c637c6ca26083178e79621e5bcad014eeb82663bbb7b", kill_on_drop: false }`
[INFO] [stdout] 03f13d5271a6e509d1c9c637c6ca26083178e79621e5bcad014eeb82663bbb7b