[INFO] fetching crate b3-rs 0.1.0...
[INFO] testing b3-rs-0.1.0 against beta-2022-02-22 for beta-1.60-1
[INFO] extracting crate b3-rs 0.1.0 into /workspace/builds/worker-29/source
[INFO] validating manifest of crates.io crate b3-rs 0.1.0 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 b3-rs 0.1.0
[INFO] finished tweaking crates.io crate b3-rs 0.1.0
[INFO] tweaked toml for crates.io crate b3-rs 0.1.0 written to /workspace/builds/worker-29/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 byteio v0.2.3
[INFO] [stderr]   Downloaded nano-leb128 v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/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] 88639502378e7198b55d508214a2d6b198e118016479a37e6df0ace03925e5ac
[INFO] running `Command { std: "docker" "start" "-a" "88639502378e7198b55d508214a2d6b198e118016479a37e6df0ace03925e5ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "88639502378e7198b55d508214a2d6b198e118016479a37e6df0ace03925e5ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "88639502378e7198b55d508214a2d6b198e118016479a37e6df0ace03925e5ac", kill_on_drop: false }`
[INFO] [stdout] 88639502378e7198b55d508214a2d6b198e118016479a37e6df0ace03925e5ac
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/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] bdf570001ebbfb7cd67833a6468d0bd2d288dfc8299ba1bacb318fe888b297f5
[INFO] running `Command { std: "docker" "start" "-a" "bdf570001ebbfb7cd67833a6468d0bd2d288dfc8299ba1bacb318fe888b297f5", kill_on_drop: false }`
[INFO] [stderr]    Compiling byteio v0.2.3
[INFO] [stderr]    Compiling nano-leb128 v0.1.0
[INFO] [stderr]    Compiling b3-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:51:12
[INFO] [stdout]    |
[INFO] [stdout] 51 | #![feature(alloc_prelude)]
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `alloc_prelude`
[INFO] [stdout]   --> src/lib.rs:51:12
[INFO] [stdout]    |
[INFO] [stdout] 51 | #![feature(alloc_prelude)]
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `b3-rs` due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "bdf570001ebbfb7cd67833a6468d0bd2d288dfc8299ba1bacb318fe888b297f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bdf570001ebbfb7cd67833a6468d0bd2d288dfc8299ba1bacb318fe888b297f5", kill_on_drop: false }`
[INFO] [stdout] bdf570001ebbfb7cd67833a6468d0bd2d288dfc8299ba1bacb318fe888b297f5