[INFO] fetching crate tuppipe 0.1.4...
[INFO] testing tuppipe-0.1.4 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate tuppipe 0.1.4 into /workspace/builds/worker-3-tc2/source
[INFO] started tweaking crates.io crate tuppipe 0.1.4
[INFO] finished tweaking crates.io crate tuppipe 0.1.4
[INFO] tweaked toml for crates.io crate tuppipe 0.1.4 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate tuppipe 0.1.4 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 6 packages to latest compatible versions
[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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] a083c7742947d809f03a6f3b44032877fa18c82976914538b2c2ba3e7a51aca7
[INFO] running `Command { std: "docker" "start" "-a" "a083c7742947d809f03a6f3b44032877fa18c82976914538b2c2ba3e7a51aca7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a083c7742947d809f03a6f3b44032877fa18c82976914538b2c2ba3e7a51aca7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a083c7742947d809f03a6f3b44032877fa18c82976914538b2c2ba3e7a51aca7", kill_on_drop: false }`
[INFO] [stdout] a083c7742947d809f03a6f3b44032877fa18c82976914538b2c2ba3e7a51aca7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 9ad441167b6bd73a725b464b238fcadc3a3f96190c9b3647b4dcba4a0409f9f7
[INFO] running `Command { std: "docker" "start" "-a" "9ad441167b6bd73a725b464b238fcadc3a3f96190c9b3647b4dcba4a0409f9f7", kill_on_drop: false }`
[INFO] [stderr]    Compiling ghost v0.1.20
[INFO] [stderr]    Compiling tuppipe v0.1.4 (/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(
[INFO] [stdout]  3 | |     fn_traits,
[INFO] [stdout]  4 | |     macro_metavar_expr,
[INFO] [stdout]  5 | |     decl_macro,
[INFO] [stdout] ...  |
[INFO] [stdout]  9 | |     negative_impls
[INFO] [stdout] 10 | | )]
[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 `tuppipe` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "9ad441167b6bd73a725b464b238fcadc3a3f96190c9b3647b4dcba4a0409f9f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ad441167b6bd73a725b464b238fcadc3a3f96190c9b3647b4dcba4a0409f9f7", kill_on_drop: false }`
[INFO] [stdout] 9ad441167b6bd73a725b464b238fcadc3a3f96190c9b3647b4dcba4a0409f9f7