[INFO] fetching crate tuifw 0.0.6...
[INFO] testing tuifw-0.0.6 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate tuifw 0.0.6 into /workspace/builds/worker-77/source
[INFO] validating manifest of crates.io crate tuifw 0.0.6 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] started tweaking crates.io crate tuifw 0.0.6
[INFO] finished tweaking crates.io crate tuifw 0.0.6
[INFO] tweaked toml for crates.io crate tuifw 0.0.6 written to /workspace/builds/worker-77/source/Cargo.toml
[INFO] crate crates.io crate tuifw 0.0.6 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]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/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] 20a3b7032dd177a8d50ce010abfc6f0c2e31149dfc323b9d63770db79908fb9c
[INFO] running `Command { std: "docker" "start" "-a" "20a3b7032dd177a8d50ce010abfc6f0c2e31149dfc323b9d63770db79908fb9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "20a3b7032dd177a8d50ce010abfc6f0c2e31149dfc323b9d63770db79908fb9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "20a3b7032dd177a8d50ce010abfc6f0c2e31149dfc323b9d63770db79908fb9c", kill_on_drop: false }`
[INFO] [stdout] 20a3b7032dd177a8d50ce010abfc6f0c2e31149dfc323b9d63770db79908fb9c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/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] e94b09ff8792ca54320e77789b68b753e6a32a72bf25ab1c7c7809958f73e2db
[INFO] running `Command { std: "docker" "start" "-a" "e94b09ff8792ca54320e77789b68b753e6a32a72bf25ab1c7c7809958f73e2db", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.27
[INFO] [stderr]    Compiling syn v1.0.73
[INFO] [stderr]    Compiling generics v0.3.2
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling panicking v0.0.1
[INFO] [stderr]    Compiling macro-attr-2018 v1.1.1
[INFO] [stderr]    Compiling paste v1.0.5
[INFO] [stderr]    Compiling bitflags v1.3.2
[INFO] [stderr]    Compiling enum-derive-2018 v1.0.2
[INFO] [stderr]    Compiling dyn-clone v1.0.4
[INFO] [stderr]    Compiling downcast-rs v1.2.0
[INFO] [stderr]    Compiling debug_panic v0.2.1
[INFO] [stderr]    Compiling unicode-width v0.1.8
[INFO] [stderr]    Compiling unicode-segmentation v1.8.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-bigint v0.4.0
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/memoffset-0.6.4/src/lib.rs:62:5
[INFO] [stdout]    |
[INFO] [stdout] 62 | /     feature(
[INFO] [stdout] 63 | |         const_ptr_offset_from,
[INFO] [stdout] 64 | |         const_maybe_uninit_as_ptr,
[INFO] [stdout] 65 | |         const_raw_ptr_deref,
[INFO] [stdout] 66 | |         const_refs_to_cell,
[INFO] [stdout] 67 | |     )
[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 `memoffset` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "e94b09ff8792ca54320e77789b68b753e6a32a72bf25ab1c7c7809958f73e2db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e94b09ff8792ca54320e77789b68b753e6a32a72bf25ab1c7c7809958f73e2db", kill_on_drop: false }`
[INFO] [stdout] e94b09ff8792ca54320e77789b68b753e6a32a72bf25ab1c7c7809958f73e2db