[INFO] fetching crate arclight 0.0.1...
[INFO] testing arclight-0.0.1 against beta-2022-02-22 for beta-1.60-1
[INFO] extracting crate arclight 0.0.1 into /workspace/builds/worker-116/source
[INFO] validating manifest of crates.io crate arclight 0.0.1 on toolchain beta-2022-02-22
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate arclight 0.0.1
[INFO] finished tweaking crates.io crate arclight 0.0.1
[INFO] tweaked toml for crates.io crate arclight 0.0.1 written to /workspace/builds/worker-116/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-116/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-116/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a14f27e1937450df86434c4d6ed8bef350a8ba662c8a93d0b14817e0762bc015
[INFO] running `Command { std: "docker" "start" "-a" "a14f27e1937450df86434c4d6ed8bef350a8ba662c8a93d0b14817e0762bc015", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a14f27e1937450df86434c4d6ed8bef350a8ba662c8a93d0b14817e0762bc015", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a14f27e1937450df86434c4d6ed8bef350a8ba662c8a93d0b14817e0762bc015", kill_on_drop: false }`
[INFO] [stdout] a14f27e1937450df86434c4d6ed8bef350a8ba662c8a93d0b14817e0762bc015
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-116/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-116/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 64dc6678688749c18427eea3d72dd1d9f1b04dfa20ecb266c88491c82a888dfb
[INFO] running `Command { std: "docker" "start" "-a" "64dc6678688749c18427eea3d72dd1d9f1b04dfa20ecb266c88491c82a888dfb", kill_on_drop: false }`
[INFO] [stderr]    Compiling arclight v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(generators)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TokenType` is imported redundantly
[INFO] [stdout]   --> src/Parser.rs:44:13
[INFO] [stdout]    |
[INFO] [stdout] 21 | / enum TokenType {
[INFO] [stdout] 22 | |     New,
[INFO] [stdout] 23 | |     Tab,
[INFO] [stdout] 24 | |     Pass,
[INFO] [stdout] ...  |
[INFO] [stdout] 27 | |     Photon,
[INFO] [stdout] 28 | | }
[INFO] [stdout]    | |_- the item `TokenType` is already defined here
[INFO] [stdout] ...
[INFO] [stdout] 44 |           use Parser::TokenType;
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt`
[INFO] [stdout]  --> src/ArclightSyntaxTree.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `arclight` due to 2 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "64dc6678688749c18427eea3d72dd1d9f1b04dfa20ecb266c88491c82a888dfb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "64dc6678688749c18427eea3d72dd1d9f1b04dfa20ecb266c88491c82a888dfb", kill_on_drop: false }`
[INFO] [stdout] 64dc6678688749c18427eea3d72dd1d9f1b04dfa20ecb266c88491c82a888dfb