[INFO] fetching crate const_unit_poc 1.1.1...
[INFO] testing const_unit_poc-1.1.1 against 1.49.0 for beta-1.50-1
[INFO] extracting crate const_unit_poc 1.1.1 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate const_unit_poc 1.1.1 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate const_unit_poc 1.1.1
[INFO] finished tweaking crates.io crate const_unit_poc 1.1.1
[INFO] tweaked toml for crates.io crate const_unit_poc 1.1.1 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate crates.io crate const_unit_poc 1.1.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 66e30ef2a97a9ced702017951c8faf0952d2702afe08b8c5f3da9286fc061cec
[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" "66e30ef2a97a9ced702017951c8faf0952d2702afe08b8c5f3da9286fc061cec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "66e30ef2a97a9ced702017951c8faf0952d2702afe08b8c5f3da9286fc061cec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "66e30ef2a97a9ced702017951c8faf0952d2702afe08b8c5f3da9286fc061cec", kill_on_drop: false }`
[INFO] [stdout] 66e30ef2a97a9ced702017951c8faf0952d2702afe08b8c5f3da9286fc061cec
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6dd3333042b74020bd2c3b597eab3ae2b186751d3f21ada0a2b4bdda529bc93f
[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" "6dd3333042b74020bd2c3b597eab3ae2b186751d3f21ada0a2b4bdda529bc93f", kill_on_drop: false }`
[INFO] [stderr]    Compiling const_unit_poc v1.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:43:1
[INFO] [stdout]    |
[INFO] [stdout] 43 | #![feature(const_generics, const_evaluatable_checked, doc_cfg)]
[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 `const_unit_poc`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "6dd3333042b74020bd2c3b597eab3ae2b186751d3f21ada0a2b4bdda529bc93f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6dd3333042b74020bd2c3b597eab3ae2b186751d3f21ada0a2b4bdda529bc93f", kill_on_drop: false }`
[INFO] [stdout] 6dd3333042b74020bd2c3b597eab3ae2b186751d3f21ada0a2b4bdda529bc93f