[INFO] fetching crate virolution 0.4.0...
[INFO] testing virolution-0.4.0 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate virolution 0.4.0 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate virolution 0.4.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate virolution 0.4.0
[INFO] tweaked toml for crates.io crate virolution 0.4.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate virolution 0.4.0 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 virolution 0.4.0 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-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] ad61da0eb30f76e279586e4c463c20ecf6f60d5e8b12900fc099790296af2e8b
[INFO] running `Command { std: "docker" "start" "-a" "ad61da0eb30f76e279586e4c463c20ecf6f60d5e8b12900fc099790296af2e8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ad61da0eb30f76e279586e4c463c20ecf6f60d5e8b12900fc099790296af2e8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ad61da0eb30f76e279586e4c463c20ecf6f60d5e8b12900fc099790296af2e8b", kill_on_drop: false }`
[INFO] [stdout] ad61da0eb30f76e279586e4c463c20ecf6f60d5e8b12900fc099790296af2e8b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 653acd6093af387974a4e600123d190b97a451ce9d8f3ec497168e2b0bde906d
[INFO] running `Command { std: "docker" "start" "-a" "653acd6093af387974a4e600123d190b97a451ce9d8f3ec497168e2b0bde906d", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.167
[INFO] [stderr]    Compiling byteorder v1.5.0
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling once_cell v1.20.2
[INFO] [stderr]    Compiling syn v2.0.89
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling serde v1.0.215
[INFO] [stderr]    Compiling clap_lex v0.7.3
[INFO] [stderr]    Compiling ahash v0.8.11
[INFO] [stderr]    Compiling clap_builder v4.5.21
[INFO] [stderr]    Compiling phf_shared v0.11.2
[INFO] [stderr]    Compiling unicode-segmentation v1.12.0
[INFO] [stderr]    Compiling crossbeam-utils v0.8.20
[INFO] [stderr]    Compiling portable-atomic v1.10.0
[INFO] [stderr]    Compiling phf_generator v0.11.2
[INFO] [stderr]    Compiling anyhow v1.0.93
[INFO] [stderr]    Compiling convert_case v0.6.0
[INFO] [stderr]    Compiling allocator-api2 v0.2.20
[INFO] [stderr]    Compiling unicode-xid v0.2.4
[INFO] [stderr]    Compiling getrandom v0.2.15
[INFO] [stderr]    Compiling parking_lot_core v0.9.10
[INFO] [stderr]    Compiling num-integer v0.1.46
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling num-complex v0.4.6
[INFO] [stderr]    Compiling console v0.15.8
[INFO] [stderr]    Compiling thread-id v3.3.0
[INFO] [stderr]    Compiling rand_pcg v0.3.1
[INFO] [stderr]    Compiling indexmap v2.6.0
[INFO] [stderr]    Compiling num-bigint v0.4.6
[INFO] [stderr]    Compiling buffer-redux v1.0.2
[INFO] [stderr]    Compiling csv-core v0.1.11
[INFO] [stderr]    Compiling scoped_threadpool v0.1.9
[INFO] [stderr]    Compiling log v0.4.22
[INFO] [stderr]    Compiling web-time v1.1.0
[INFO] [stderr]    Compiling number_prefix v0.4.0
[INFO] [stderr]    Compiling cached_proc_macro_types v0.1.1
[INFO] [stderr]    Compiling indicatif v0.17.9
[INFO] [stderr]    Compiling simple-logging v2.0.2
[INFO] [stderr]    Compiling parking_lot v0.12.3
[INFO] [stderr]    Compiling evalexpr v12.0.1
[INFO] [stderr]    Compiling npyz-derive v0.7.0
[INFO] [stderr]    Compiling derivative v2.2.0
[INFO] [stderr]    Compiling darling_core v0.20.10
[INFO] [stderr]    Compiling zerocopy-derive v0.7.35
[INFO] [stderr]    Compiling thiserror-impl v1.0.69
[INFO] [stderr]    Compiling serde_derive v1.0.215
[INFO] [stderr]    Compiling clap_derive v4.5.18
[INFO] [stderr]    Compiling phf_macros v0.11.2
[INFO] [stderr]    Compiling derive_more-impl v1.0.0
[INFO] [stderr]    Compiling derive-where v1.2.7
[INFO] [stderr]    Compiling phf v0.11.2
[INFO] [stderr]    Compiling zerocopy v0.7.35
[INFO] [stderr]    Compiling virolution-macros v0.1.0
[INFO] [stderr]    Compiling thiserror v1.0.69
[INFO] [stderr]    Compiling pest v2.7.14
[INFO] [stderr]    Compiling ppv-lite86 v0.2.20
[INFO] [stderr]    Compiling clap v4.5.21
[INFO] [stderr]    Compiling clap_complete v4.5.38
[INFO] [stderr]    Compiling darling_macro v0.20.10
[INFO] [stderr]    Compiling hashbrown v0.14.5
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling darling v0.20.10
[INFO] [stderr]    Compiling cached_proc_macro v0.23.0
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling virolution v0.4.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling pest_meta v2.7.14
[INFO] [stderr]    Compiling cached v0.54.0
[INFO] [stderr]    Compiling rand_distr v0.4.3
[INFO] [stderr]    Compiling block-id v0.2.1
[INFO] [stderr]    Compiling pest_generator v2.7.14
[INFO] [stderr]    Compiling derive_more v1.0.0
[INFO] [stderr]    Compiling pest_derive v2.7.14
[INFO] [stderr]    Compiling py_literal v0.4.0
[INFO] [stderr]    Compiling npyz v0.8.3
[INFO] [stderr]    Compiling seq_io v0.3.2
[INFO] [stderr]    Compiling csv v1.3.1
[INFO] [stderr]    Compiling serde_yaml v0.9.34+deprecated
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]    --> src/core/haplotype.rs:372:16
[INFO] [stdout]     |
[INFO] [stdout] 372 |             && let Some(idx) = descendants_guard.iter().position(|x| !x.exists())
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]    --> src/references/cell.rs:109:16
[INFO] [stdout]     |
[INFO] [stdout] 109 |             && let Some(mutant) = self.try_unwrap_mutant()
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]    --> src/references/sync.rs:110:16
[INFO] [stdout]     |
[INFO] [stdout] 110 |             && let Some(mutant) = self.try_unwrap_mutant()
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]    --> src/runner.rs:234:20
[INFO] [stdout]     |
[INFO] [stdout] 234 |                 if let Some(path) = path
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]    --> src/runner.rs:257:24
[INFO] [stdout]     |
[INFO] [stdout] 257 |                     if let Some(path) = path
[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:131:1
[INFO] [stdout]     |
[INFO] [stdout] 131 | #![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] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]    --> src/lib.rs:132:1
[INFO] [stdout]     |
[INFO] [stdout] 132 | #![feature(extract_if)]
[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:133:1
[INFO] [stdout]     |
[INFO] [stdout] 133 | #![feature(test)]
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^
[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:131:12
[INFO] [stdout]     |
[INFO] [stdout] 131 | #![feature(let_chains)]
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `extract_if` has been stable since 1.87.0 and no longer requires an attribute to enable
[INFO] [stdout]    --> src/lib.rs:132:12
[INFO] [stdout]     |
[INFO] [stdout] 132 | #![feature(extract_if)]
[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 `virolution` (lib) due to 8 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "653acd6093af387974a4e600123d190b97a451ce9d8f3ec497168e2b0bde906d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "653acd6093af387974a4e600123d190b97a451ce9d8f3ec497168e2b0bde906d", kill_on_drop: false }`
[INFO] [stdout] 653acd6093af387974a4e600123d190b97a451ce9d8f3ec497168e2b0bde906d
