[INFO] fetching crate sluggish-write 0.2.1...
[INFO] testing sluggish-write-0.2.1 against 1.99.0-beta.8 for beta-1.100-2
[INFO] extracting crate sluggish-write 0.2.1 into /workspace/builds/worker-1-tc1/source
[INFO] started tweaking crates.io crate sluggish-write 0.2.1
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate sluggish-write 0.2.1
[INFO] tweaked toml for crates.io crate sluggish-write 0.2.1 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate sluggish-write 0.2.1 on toolchain 1.99.0-beta.8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate sluggish-write 0.2.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded zeros v20.0.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3111399a4047eeb3a02b7a90e478d715f38a8c6669b5c4b49d30a17385265909" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 2abb52c2b3605b03d76f4315cbe71f5c534dc8ea61c9c9cdab1513cf09e8b555
[INFO] running `Command { std: "docker" "start" "2abb52c2b3605b03d76f4315cbe71f5c534dc8ea61c9c9cdab1513cf09e8b555", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2abb52c2b3605b03d76f4315cbe71f5c534dc8ea61c9c9cdab1513cf09e8b555", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "2abb52c2b3605b03d76f4315cbe71f5c534dc8ea61c9c9cdab1513cf09e8b555" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2abb52c2b3605b03d76f4315cbe71f5c534dc8ea61c9c9cdab1513cf09e8b555", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "2abb52c2b3605b03d76f4315cbe71f5c534dc8ea61c9c9cdab1513cf09e8b555" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling sluggish-write v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:47:1
[INFO] [stdout]    |
[INFO] [stdout] 47 | #![feature(variant_count)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `err`
[INFO] [stdout]   --> src/lib.rs:90:14
[INFO] [stdout]    |
[INFO] [stdout] 90 | macro_rules! err {
[INFO] [stdout]    |              ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_macros)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `sluggish-write` (lib) due to 1 previous error; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "2abb52c2b3605b03d76f4315cbe71f5c534dc8ea61c9c9cdab1513cf09e8b555", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2abb52c2b3605b03d76f4315cbe71f5c534dc8ea61c9c9cdab1513cf09e8b555", kill_on_drop: false }`
[INFO] [stdout] 2abb52c2b3605b03d76f4315cbe71f5c534dc8ea61c9c9cdab1513cf09e8b555
