[INFO] fetching crate nut_sys 0.2.0...
[INFO] testing nut_sys-0.2.0 against 1.91.0 for beta-1.92-2
[INFO] extracting crate nut_sys 0.2.0 into /workspace/builds/worker-7-tc1/source
[INFO] started tweaking crates.io crate nut_sys 0.2.0
[INFO] finished tweaking crates.io crate nut_sys 0.2.0
[INFO] tweaked toml for crates.io crate nut_sys 0.2.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate nut_sys 0.2.0 on toolchain 1.91.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate nut_sys 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" "+1.91.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded auto_ops v0.3.0
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6804c28640abd5c18d35bd0bc708ed64de57ec8c5ec991ea9d6902dcea25470e
[INFO] running `Command { std: "docker" "start" "-a" "6804c28640abd5c18d35bd0bc708ed64de57ec8c5ec991ea9d6902dcea25470e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6804c28640abd5c18d35bd0bc708ed64de57ec8c5ec991ea9d6902dcea25470e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6804c28640abd5c18d35bd0bc708ed64de57ec8c5ec991ea9d6902dcea25470e", kill_on_drop: false }`
[INFO] [stdout] 6804c28640abd5c18d35bd0bc708ed64de57ec8c5ec991ea9d6902dcea25470e
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 50bbca216c65ecafc16abc3e46ba6c6d7febfd2380fb70042640beba3854cc8c
[INFO] running `Command { std: "docker" "start" "-a" "50bbca216c65ecafc16abc3e46ba6c6d7febfd2380fb70042640beba3854cc8c", kill_on_drop: false }`
[INFO] [stderr]    Compiling nut_sys v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling auto_ops v0.3.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(allocator_api, ptr_as_ref_unchecked, impl_trait_in_assoc_type)]
[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 `nut_sys` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "50bbca216c65ecafc16abc3e46ba6c6d7febfd2380fb70042640beba3854cc8c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "50bbca216c65ecafc16abc3e46ba6c6d7febfd2380fb70042640beba3854cc8c", kill_on_drop: false }`
[INFO] [stdout] 50bbca216c65ecafc16abc3e46ba6c6d7febfd2380fb70042640beba3854cc8c