[INFO] fetching crate puroro-protobuf-compiled 0.4.1...
[INFO] testing puroro-protobuf-compiled-0.4.1 against 1.60.0 for beta-1.61-1
[INFO] extracting crate puroro-protobuf-compiled 0.4.1 into /workspace/builds/worker-11/source
[INFO] validating manifest of crates.io crate puroro-protobuf-compiled 0.4.1 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate puroro-protobuf-compiled 0.4.1
[INFO] finished tweaking crates.io crate puroro-protobuf-compiled 0.4.1
[INFO] tweaked toml for crates.io crate puroro-protobuf-compiled 0.4.1 written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded puroro v0.4.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 65ec1c3f11d81406df3e17bb54a7f3968d92b77d93f94a97b189a3b69cf6d685
[INFO] running `Command { std: "docker" "start" "-a" "65ec1c3f11d81406df3e17bb54a7f3968d92b77d93f94a97b189a3b69cf6d685", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "65ec1c3f11d81406df3e17bb54a7f3968d92b77d93f94a97b189a3b69cf6d685", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "65ec1c3f11d81406df3e17bb54a7f3968d92b77d93f94a97b189a3b69cf6d685", kill_on_drop: false }`
[INFO] [stdout] 65ec1c3f11d81406df3e17bb54a7f3968d92b77d93f94a97b189a3b69cf6d685
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 00164b53cf84a2195e7563b3c15e17b6af0a3d8d3c6fc09a2c6c3b9f2dc18a10
[INFO] running `Command { std: "docker" "start" "-a" "00164b53cf84a2195e7563b3c15e17b6af0a3d8d3c6fc09a2c6c3b9f2dc18a10", kill_on_drop: false }`
[INFO] [stderr]    Compiling bumpalo v3.9.1
[INFO] [stderr]    Compiling bitvec v0.22.3
[INFO] [stderr]    Compiling puroro v0.4.1
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/puroro-0.4.1/src/lib.rs:16:1
[INFO] [stdout]    |
[INFO] [stdout] 16 | #![feature(backtrace)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/puroro-0.4.1/src/lib.rs:17:1
[INFO] [stdout]    |
[INFO] [stdout] 17 | #![feature(generic_associated_types)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/puroro-0.4.1/src/lib.rs:18:1
[INFO] [stdout]    |
[INFO] [stdout] 18 | #![feature(type_alias_impl_trait)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `puroro` due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "00164b53cf84a2195e7563b3c15e17b6af0a3d8d3c6fc09a2c6c3b9f2dc18a10", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "00164b53cf84a2195e7563b3c15e17b6af0a3d8d3c6fc09a2c6c3b9f2dc18a10", kill_on_drop: false }`
[INFO] [stdout] 00164b53cf84a2195e7563b3c15e17b6af0a3d8d3c6fc09a2c6c3b9f2dc18a10