[INFO] fetching crate yew-route-breadcrumbs 0.1.2...
[INFO] testing yew-route-breadcrumbs-0.1.2 against beta-2021-01-01 for beta-1.50-1
[INFO] extracting crate yew-route-breadcrumbs 0.1.2 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate yew-route-breadcrumbs 0.1.2 on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate yew-route-breadcrumbs 0.1.2
[INFO] finished tweaking crates.io crate yew-route-breadcrumbs 0.1.2
[INFO] tweaked toml for crates.io crate yew-route-breadcrumbs 0.1.2 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate crates.io crate yew-route-breadcrumbs 0.1.2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded yew-route-breadcrumbs-derive v0.1.2
[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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "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] 68c961e52f7ee9642cad86143bdd1d8a98e0ee7f1e6fac7d091034b21d804aa6
[INFO] running `Command { std: "docker" "start" "-a" "68c961e52f7ee9642cad86143bdd1d8a98e0ee7f1e6fac7d091034b21d804aa6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "68c961e52f7ee9642cad86143bdd1d8a98e0ee7f1e6fac7d091034b21d804aa6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "68c961e52f7ee9642cad86143bdd1d8a98e0ee7f1e6fac7d091034b21d804aa6", kill_on_drop: false }`
[INFO] [stdout] 68c961e52f7ee9642cad86143bdd1d8a98e0ee7f1e6fac7d091034b21d804aa6
[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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "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] 7ab0ef06556d00e08f9b1976eae9133ba246fae6e15f0ca5228c50012f5a768d
[INFO] running `Command { std: "docker" "start" "-a" "7ab0ef06556d00e08f9b1976eae9133ba246fae6e15f0ca5228c50012f5a768d", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.21
[INFO] [stderr]    Compiling syn v1.0.41
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling yew-route-breadcrumbs-derive v0.1.2
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/yew-route-breadcrumbs-derive-0.1.2/src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(proc_macro_diagnostic)]
[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 `yew-route-breadcrumbs-derive`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "7ab0ef06556d00e08f9b1976eae9133ba246fae6e15f0ca5228c50012f5a768d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7ab0ef06556d00e08f9b1976eae9133ba246fae6e15f0ca5228c50012f5a768d", kill_on_drop: false }`
[INFO] [stdout] 7ab0ef06556d00e08f9b1976eae9133ba246fae6e15f0ca5228c50012f5a768d