[INFO] fetching crate phlow-ffi 1.1.0...
[INFO] testing phlow-ffi-1.1.0 against 1.75.0 for beta-1.76-1
[INFO] extracting crate phlow-ffi 1.1.0 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate phlow-ffi 1.1.0 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate phlow-ffi 1.1.0
[INFO] finished tweaking crates.io crate phlow-ffi 1.1.0
[INFO] tweaked toml for crates.io crate phlow-ffi 1.1.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded phlow-derive v1.4.0
[INFO] [stderr]   Downloaded rust-format v0.3.4
[INFO] [stderr]   Downloaded user-error v1.2.8
[INFO] [stderr]   Downloaded string-box v1.1.1
[INFO] [stderr]   Downloaded phlow v1.7.0
[INFO] [stderr]   Downloaded value-box v2.3.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6afe8022355f268bf3656c194f927b13d65fff8c82423ae89da2c2a284e35988
[INFO] running `Command { std: "docker" "start" "-a" "6afe8022355f268bf3656c194f927b13d65fff8c82423ae89da2c2a284e35988", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6afe8022355f268bf3656c194f927b13d65fff8c82423ae89da2c2a284e35988", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6afe8022355f268bf3656c194f927b13d65fff8c82423ae89da2c2a284e35988", kill_on_drop: false }`
[INFO] [stdout] 6afe8022355f268bf3656c194f927b13d65fff8c82423ae89da2c2a284e35988
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 77d49ceebb2ca6a3d23a6eabd52ee0524ea0456b6526a359b7fa72911965ac89
[INFO] running `Command { std: "docker" "start" "-a" "77d49ceebb2ca6a3d23a6eabd52ee0524ea0456b6526a359b7fa72911965ac89", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.151
[INFO] [stderr]    Compiling parking_lot_core v0.9.9
[INFO] [stderr]    Compiling smallvec v1.11.2
[INFO] [stderr]    Compiling lock_api v0.4.11
[INFO] [stderr]    Compiling thiserror v1.0.56
[INFO] [stderr]    Compiling user-error v1.2.8
[INFO] [stderr]    Compiling rust-format v0.3.4
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]    Compiling widestring v1.0.2
[INFO] [stderr]    Compiling string-box v1.1.1
[INFO] [stderr]    Compiling parking_lot v0.12.1
[INFO] [stderr]    Compiling thiserror-impl v1.0.56
[INFO] [stderr]    Compiling phlow-derive v1.4.0
[INFO] [stderr]    Compiling phlow v1.7.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/phlow-1.7.0/src/lib.rs:4:35
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![cfg_attr(feature = "printing", feature(specialization))]
[INFO] [stdout]   |                                   ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `phlow` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "77d49ceebb2ca6a3d23a6eabd52ee0524ea0456b6526a359b7fa72911965ac89", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "77d49ceebb2ca6a3d23a6eabd52ee0524ea0456b6526a359b7fa72911965ac89", kill_on_drop: false }`
[INFO] [stdout] 77d49ceebb2ca6a3d23a6eabd52ee0524ea0456b6526a359b7fa72911965ac89
