[INFO] fetching crate ruapc 0.1.2...
[INFO] testing ruapc-0.1.2 against beta-2025-10-28 for beta-1.92-2
[INFO] extracting crate ruapc 0.1.2 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate ruapc 0.1.2
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate ruapc 0.1.2
[INFO] tweaked toml for crates.io crate ruapc 0.1.2 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate ruapc 0.1.2 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 ruapc 0.1.2 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-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8eadbfde94a0567ff9ef8d13ad50864c7014ae2abb176ab120027e2ca22e3e9e
[INFO] running `Command { std: "docker" "start" "-a" "8eadbfde94a0567ff9ef8d13ad50864c7014ae2abb176ab120027e2ca22e3e9e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8eadbfde94a0567ff9ef8d13ad50864c7014ae2abb176ab120027e2ca22e3e9e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8eadbfde94a0567ff9ef8d13ad50864c7014ae2abb176ab120027e2ca22e3e9e", kill_on_drop: false }`
[INFO] [stdout] 8eadbfde94a0567ff9ef8d13ad50864c7014ae2abb176ab120027e2ca22e3e9e
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5bfefb4d9e80cd9ed59e89f1a6f7405bbb9a455c2c1e879589cb77c5542adb1c
[INFO] running `Command { std: "docker" "start" "-a" "5bfefb4d9e80cd9ed59e89f1a6f7405bbb9a455c2c1e879589cb77c5542adb1c", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.101
[INFO] [stderr]    Compiling libc v0.2.175
[INFO] [stderr]    Compiling cfg-if v1.0.3
[INFO] [stderr]    Compiling parking_lot_core v0.9.11
[INFO] [stderr]    Compiling lock_api v0.4.13
[INFO] [stderr]    Compiling http v1.3.1
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling log v0.4.27
[INFO] [stderr]    Compiling thiserror v2.0.16
[INFO] [stderr]    Compiling hashbrown v0.15.5
[INFO] [stderr]    Compiling anstyle-parse v0.2.7
[INFO] [stderr]    Compiling anstyle-query v1.1.4
[INFO] [stderr]    Compiling colorchoice v1.0.4
[INFO] [stderr]    Compiling toml_datetime v0.6.11
[INFO] [stderr]    Compiling serde_json v1.0.143
[INFO] [stderr]    Compiling ref-cast v1.0.24
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]    Compiling anstream v0.6.20
[INFO] [stderr]    Compiling http-body v1.0.1
[INFO] [stderr]    Compiling crypto-common v0.1.6
[INFO] [stderr]    Compiling block-buffer v0.10.4
[INFO] [stderr]    Compiling indexmap v2.11.0
[INFO] [stderr]    Compiling iana-time-zone v0.1.63
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling overload v0.1.1
[INFO] [stderr]    Compiling nu-ansi-term v0.46.0
[INFO] [stderr]    Compiling rmp v0.8.14
[INFO] [stderr]    Compiling digest v0.10.7
[INFO] [stderr]    Compiling chrono v0.4.41
[INFO] [stderr]    Compiling sha1 v0.10.6
[INFO] [stderr]    Compiling clap_builder v4.5.46
[INFO] [stderr]    Compiling sharded-slab v0.1.7
[INFO] [stderr]    Compiling signal-hook-registry v1.4.6
[INFO] [stderr]    Compiling getrandom v0.3.3
[INFO] [stderr]    Compiling socket2 v0.6.0
[INFO] [stderr]    Compiling mio v1.0.4
[INFO] [stderr]    Compiling parking_lot v0.12.4
[INFO] [stderr]    Compiling rand_core v0.9.3
[INFO] [stderr]    Compiling toml_edit v0.22.27
[INFO] [stderr]    Compiling rand_chacha v0.9.0
[INFO] [stderr]    Compiling http-body-util v0.1.3
[INFO] [stderr]    Compiling rand v0.9.2
[INFO] [stderr]    Compiling tracing-log v0.2.0
[INFO] [stderr]    Compiling thread_local v1.1.9
[INFO] [stderr]    Compiling hashbrown v0.14.5
[INFO] [stderr]    Compiling humantime v2.2.0
[INFO] [stderr]    Compiling tracing-subscriber v0.3.19
[INFO] [stderr]    Compiling bitflags v2.9.3
[INFO] [stderr]    Compiling dashmap v6.1.0
[INFO] [stderr]    Compiling proc-macro-crate v3.3.0
[INFO] [stderr]    Compiling serde_derive_internals v0.29.1
[INFO] [stderr]    Compiling tokio-macros v2.5.0
[INFO] [stderr]    Compiling serde_derive v1.0.219
[INFO] [stderr]    Compiling thiserror-impl v2.0.16
[INFO] [stderr]    Compiling futures-macro v0.3.31
[INFO] [stderr]    Compiling ref-cast-impl v1.0.24
[INFO] [stderr]    Compiling clap_derive v4.5.45
[INFO] [stderr]    Compiling tracing-attributes v0.1.30
[INFO] [stderr]    Compiling schemars_derive v1.0.4
[INFO] [stderr]    Compiling tokio v1.47.1
[INFO] [stderr]    Compiling serde-inline-default v0.2.3
[INFO] [stderr]    Compiling futures-util v0.3.31
[INFO] [stderr]    Compiling ruapc-macro v0.1.1
[INFO] [stderr]    Compiling tungstenite v0.27.0
[INFO] [stderr]    Compiling tracing v0.1.41
[INFO] [stderr]    Compiling clap v4.5.46
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]    Compiling hyper v1.7.0
[INFO] [stderr]    Compiling tokio-tungstenite v0.27.0
[INFO] [stderr]    Compiling tokio-util v0.7.16
[INFO] [stderr]    Compiling rmp-serde v1.3.0
[INFO] [stderr]    Compiling humantime-serde v1.1.1
[INFO] [stderr]    Compiling hyper-util v0.1.16
[INFO] [stderr]    Compiling schemars v1.0.4
[INFO] [stderr]    Compiling hyper-tungstenite v0.18.0
[INFO] [stderr]    Compiling ruapc v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(return_type_notation)]
[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 `ruapc` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "5bfefb4d9e80cd9ed59e89f1a6f7405bbb9a455c2c1e879589cb77c5542adb1c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5bfefb4d9e80cd9ed59e89f1a6f7405bbb9a455c2c1e879589cb77c5542adb1c", kill_on_drop: false }`
[INFO] [stdout] 5bfefb4d9e80cd9ed59e89f1a6f7405bbb9a455c2c1e879589cb77c5542adb1c
