[INFO] fetching crate autoproto 0.1.2...
[INFO] testing autoproto-0.1.2 against 1.55.0 for beta-1.56-1
[INFO] extracting crate autoproto 0.1.2 into /workspace/builds/worker-11/source
[INFO] validating manifest of crates.io crate autoproto 0.1.2 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate autoproto 0.1.2
[INFO] finished tweaking crates.io crate autoproto 0.1.2
[INFO] tweaked toml for crates.io crate autoproto 0.1.2 written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8c9469b7f46516da1bc4362cfa4e4256a33d7ccfded66fc1445562f7bbaad005
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "8c9469b7f46516da1bc4362cfa4e4256a33d7ccfded66fc1445562f7bbaad005", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8c9469b7f46516da1bc4362cfa4e4256a33d7ccfded66fc1445562f7bbaad005", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c9469b7f46516da1bc4362cfa4e4256a33d7ccfded66fc1445562f7bbaad005", kill_on_drop: false }`
[INFO] [stdout] 8c9469b7f46516da1bc4362cfa4e4256a33d7ccfded66fc1445562f7bbaad005
[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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "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] ce48851579636e4dacd15e4e3ae6f3858f75d9efb22e60827ad867eeb519162a
[INFO] running `Command { std: "docker" "start" "-a" "ce48851579636e4dacd15e4e3ae6f3858f75d9efb22e60827ad867eeb519162a", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.76
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling bytes v1.1.0
[INFO] [stderr]    Compiling arrayvec v0.7.1
[INFO] [stderr]    Compiling static_assertions v1.1.0
[INFO] [stderr]    Compiling smallvec v1.6.1
[INFO] [stderr]    Compiling itertools v0.10.1
[INFO] [stderr]    Compiling prost-derive v0.8.0
[INFO] [stderr]    Compiling autoproto-derive v0.1.0
[INFO] [stderr]    Compiling prost v0.8.0
[INFO] [stderr]    Compiling autoproto v0.1.2 (/opt/rustwide/workdir)
[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(generic_associated_types)]
[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 `autoproto` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "ce48851579636e4dacd15e4e3ae6f3858f75d9efb22e60827ad867eeb519162a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce48851579636e4dacd15e4e3ae6f3858f75d9efb22e60827ad867eeb519162a", kill_on_drop: false }`
[INFO] [stdout] ce48851579636e4dacd15e4e3ae6f3858f75d9efb22e60827ad867eeb519162a