[INFO] fetching crate rdxl_scaffolding 0.1.1...
[INFO] testing rdxl_scaffolding-0.1.1 against beta-2021-01-01 for beta-1.50-1
[INFO] extracting crate rdxl_scaffolding 0.1.1 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate rdxl_scaffolding 0.1.1 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 rdxl_scaffolding 0.1.1
[INFO] finished tweaking crates.io crate rdxl_scaffolding 0.1.1
[INFO] tweaked toml for crates.io crate rdxl_scaffolding 0.1.1 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate crates.io crate rdxl_scaffolding 0.1.1 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 serde_derive v1.0.113
[INFO] [stderr]   Downloaded serde v1.0.113
[INFO] [stderr]   Downloaded syn v1.0.30
[INFO] [stderr]   Downloaded serde_json v1.0.55
[INFO] [stderr]   Downloaded mxml v0.1.2
[INFO] [stderr]   Downloaded hermit-abi v0.1.14
[INFO] [stderr]   Downloaded mxml_dep v0.1.3
[INFO] [stderr]   Downloaded rdxl v0.5.5
[INFO] [stderr]   Downloaded html_parser v0.4.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/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] 88339403f0b0a4e3edd4e304c178135d243e3afa7ea6fe6fddcb67a08e1b9d46
[INFO] running `Command { std: "docker" "start" "-a" "88339403f0b0a4e3edd4e304c178135d243e3afa7ea6fe6fddcb67a08e1b9d46", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "88339403f0b0a4e3edd4e304c178135d243e3afa7ea6fe6fddcb67a08e1b9d46", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "88339403f0b0a4e3edd4e304c178135d243e3afa7ea6fe6fddcb67a08e1b9d46", kill_on_drop: false }`
[INFO] [stdout] 88339403f0b0a4e3edd4e304c178135d243e3afa7ea6fe6fddcb67a08e1b9d46
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/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] 784305ef861d4f0ef907e1d82bede2b4c581d86e07a9abc066b9c4528f62986b
[INFO] running `Command { std: "docker" "start" "-a" "784305ef861d4f0ef907e1d82bede2b4c581d86e07a9abc066b9c4528f62986b", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.18
[INFO] [stderr]    Compiling syn v1.0.30
[INFO] [stderr]    Compiling libc v0.2.71
[INFO] [stderr]    Compiling serde_derive v1.0.113
[INFO] [stderr]    Compiling serde v1.0.113
[INFO] [stderr]    Compiling anyhow v1.0.31
[INFO] [stderr]    Compiling serde_json v1.0.55
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.2
[INFO] [stderr]    Compiling proc-macro-error v1.0.2
[INFO] [stderr]    Compiling quote v1.0.6
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling clap v2.33.1
[INFO] [stderr]    Compiling syn-mid v0.5.0
[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]    Compiling thiserror-impl v1.0.20
[INFO] [stderr]    Compiling rdxl v0.5.5
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]    Compiling structopt-derive v0.4.8
[INFO] [stderr]    Compiling thiserror v1.0.20
[INFO] [stderr]    Compiling structopt v0.3.15
[INFO] [stderr]    Compiling html_parser v0.4.2
[INFO] [stderr]    Compiling mxml_dep v0.1.3
[INFO] [stderr]    Compiling mxml v0.1.2
[INFO] [stderr]    Compiling rdxl_scaffolding v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/build_index.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro_hygiene)]
[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 `rdxl_scaffolding`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "784305ef861d4f0ef907e1d82bede2b4c581d86e07a9abc066b9c4528f62986b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "784305ef861d4f0ef907e1d82bede2b4c581d86e07a9abc066b9c4528f62986b", kill_on_drop: false }`
[INFO] [stdout] 784305ef861d4f0ef907e1d82bede2b4c581d86e07a9abc066b9c4528f62986b