[INFO] fetching crate zerogc-simple 0.2.0-alpha.4...
[INFO] testing zerogc-simple-0.2.0-alpha.4 against 1.54.0 for beta-1.55-1
[INFO] extracting crate zerogc-simple 0.2.0-alpha.4 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate zerogc-simple 0.2.0-alpha.4 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate zerogc-simple 0.2.0-alpha.4
[INFO] finished tweaking crates.io crate zerogc-simple 0.2.0-alpha.4
[INFO] tweaked toml for crates.io crate zerogc-simple 0.2.0-alpha.4 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate crates.io crate zerogc-simple 0.2.0-alpha.4 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5b97f27fa912564f5a8a0eaaba6b529280a650dcdfbbe51fce707dc3854164a4
[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" "5b97f27fa912564f5a8a0eaaba6b529280a650dcdfbbe51fce707dc3854164a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5b97f27fa912564f5a8a0eaaba6b529280a650dcdfbbe51fce707dc3854164a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5b97f27fa912564f5a8a0eaaba6b529280a650dcdfbbe51fce707dc3854164a4", kill_on_drop: false }`
[INFO] [stdout] 5b97f27fa912564f5a8a0eaaba6b529280a650dcdfbbe51fce707dc3854164a4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 899da0001f6f6072d0568c9a1acd9576ce5a9194dad4e256e9df2d53dac6e384
[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" "899da0001f6f6072d0568c9a1acd9576ce5a9194dad4e256e9df2d53dac6e384", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.73
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling parking_lot_core v0.8.3
[INFO] [stderr]    Compiling lock_api v0.4.4
[INFO] [stderr]    Compiling parking_lot v0.11.1
[INFO] [stderr]    Compiling zerogc-derive v0.2.0-alpha.4
[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/zerogc-derive-0.2.0-alpha.4/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | / #![feature(
[INFO] [stdout] 2 | |     proc_macro_tracked_env, // Used for `DEBUG_DERIVE`
[INFO] [stdout] 3 | |     proc_macro_span, // Used for source file ids
[INFO] [stdout] 4 | | )]
[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 `zerogc-derive`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "899da0001f6f6072d0568c9a1acd9576ce5a9194dad4e256e9df2d53dac6e384", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "899da0001f6f6072d0568c9a1acd9576ce5a9194dad4e256e9df2d53dac6e384", kill_on_drop: false }`
[INFO] [stdout] 899da0001f6f6072d0568c9a1acd9576ce5a9194dad4e256e9df2d53dac6e384
