[INFO] fetching crate sidetree 0.5.0...
[INFO] testing sidetree-0.5.0 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate sidetree 0.5.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate sidetree 0.5.0 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-2/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate sidetree 0.5.0
[INFO] finished tweaking crates.io crate sidetree 0.5.0
[INFO] tweaked toml for crates.io crate sidetree 0.5.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate crates.io crate sidetree 0.5.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded redox_termios v0.1.2
[INFO] [stderr]   Downloaded cassowary v0.3.0
[INFO] [stderr]   Downloaded termion v1.5.6
[INFO] [stderr]   Downloaded combine v4.5.2
[INFO] [stderr]   Downloaded tui v0.14.0
[INFO] [stderr]   Downloaded numtoa v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ba948f9e73c17cbe488ee9b2cfb4384b5ab28907629fe3c3eb03ee7d11b8bfbd
[INFO] running `Command { std: "docker" "start" "-a" "ba948f9e73c17cbe488ee9b2cfb4384b5ab28907629fe3c3eb03ee7d11b8bfbd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ba948f9e73c17cbe488ee9b2cfb4384b5ab28907629fe3c3eb03ee7d11b8bfbd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ba948f9e73c17cbe488ee9b2cfb4384b5ab28907629fe3c3eb03ee7d11b8bfbd", kill_on_drop: false }`
[INFO] [stdout] ba948f9e73c17cbe488ee9b2cfb4384b5ab28907629fe3c3eb03ee7d11b8bfbd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 901cdf95c6a2529a6ece0fdd9714dc83b4c200a2796fa5c712f8947b6ce44192
[INFO] running `Command { std: "docker" "start" "-a" "901cdf95c6a2529a6ece0fdd9714dc83b4c200a2796fa5c712f8947b6ce44192", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling syn v1.0.70
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling numtoa v0.1.0
[INFO] [stderr]    Compiling cassowary v0.3.0
[INFO] [stderr]    Compiling path-dedot v3.0.12
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling path-absolutize v3.0.10
[INFO] [stderr]    Compiling termion v1.5.6
[INFO] [stderr]    Compiling tui v0.14.0
[INFO] [stderr]    Compiling combine v4.5.2
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling serde_derive v1.0.125
[INFO] [stderr]    Compiling clap_derive v3.0.0-beta.2
[INFO] [stderr]    Compiling clap v3.0.0-beta.2
[INFO] [stderr]    Compiling serde v1.0.125
[INFO] [stderr]    Compiling toml v0.5.8
[INFO] [stderr]    Compiling sidetree v0.5.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(generators, generator_trait)]
[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 `sidetree` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "901cdf95c6a2529a6ece0fdd9714dc83b4c200a2796fa5c712f8947b6ce44192", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "901cdf95c6a2529a6ece0fdd9714dc83b4c200a2796fa5c712f8947b6ce44192", kill_on_drop: false }`
[INFO] [stdout] 901cdf95c6a2529a6ece0fdd9714dc83b4c200a2796fa5c712f8947b6ce44192