[INFO] fetching crate rifgen 0.1.51...
[INFO] testing rifgen-0.1.51 against beta-2022-02-22 for beta-1.60-1
[INFO] extracting crate rifgen 0.1.51 into /workspace/builds/worker-66/source
[INFO] validating manifest of crates.io crate rifgen 0.1.51 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 rifgen 0.1.51
[INFO] finished tweaking crates.io crate rifgen 0.1.51
[INFO] tweaked toml for crates.io crate rifgen 0.1.51 written to /workspace/builds/worker-66/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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded derive-new v0.5.9
[INFO] [stderr]   Downloaded rifgen_attr v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-66/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-66/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] 8cd3be5d33478c1baf16ff920b6daddf145c6a45c813f946cfe99e4eb126b4e3
[INFO] running `Command { std: "docker" "start" "-a" "8cd3be5d33478c1baf16ff920b6daddf145c6a45c813f946cfe99e4eb126b4e3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8cd3be5d33478c1baf16ff920b6daddf145c6a45c813f946cfe99e4eb126b4e3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8cd3be5d33478c1baf16ff920b6daddf145c6a45c813f946cfe99e4eb126b4e3", kill_on_drop: false }`
[INFO] [stdout] 8cd3be5d33478c1baf16ff920b6daddf145c6a45c813f946cfe99e4eb126b4e3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-66/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-66/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] 7314e680f0e2f97949716bf53b99bc0fa2c75ae515d7f3ed93688cea4aaee124
[INFO] running `Command { std: "docker" "start" "-a" "7314e680f0e2f97949716bf53b99bc0fa2c75ae515d7f3ed93688cea4aaee124", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.86
[INFO] [stderr]    Compiling regex-syntax v0.6.25
[INFO] [stderr]    Compiling aho-corasick v0.7.18
[INFO] [stderr]    Compiling regex v1.5.4
[INFO] [stderr]    Compiling Inflector v0.11.4
[INFO] [stderr]    Compiling derive-new v0.5.9
[INFO] [stderr]    Compiling rifgen_attr v0.1.0
[INFO] [stderr]    Compiling rifgen v0.1.51 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(drain_filter)]
[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 `rifgen` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "7314e680f0e2f97949716bf53b99bc0fa2c75ae515d7f3ed93688cea4aaee124", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7314e680f0e2f97949716bf53b99bc0fa2c75ae515d7f3ed93688cea4aaee124", kill_on_drop: false }`
[INFO] [stdout] 7314e680f0e2f97949716bf53b99bc0fa2c75ae515d7f3ed93688cea4aaee124