[INFO] fetching crate libpebble 0.3.0...
[INFO] testing libpebble-0.3.0 against beta-2021-08-01 for beta-1.55-1
[INFO] extracting crate libpebble 0.3.0 into /workspace/builds/worker-50/source
[INFO] validating manifest of crates.io crate libpebble 0.3.0 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate libpebble 0.3.0
[INFO] finished tweaking crates.io crate libpebble 0.3.0
[INFO] tweaked toml for crates.io crate libpebble 0.3.0 written to /workspace/builds/worker-50/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rustc-std-workspace-core v1.0.0
[INFO] [stderr]   Downloaded ptah_derive v0.1.0
[INFO] [stderr]   Downloaded pci_types v0.2.0
[INFO] [stderr]   Downloaded ptah v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 32f305f1e72065af7c2e249f0a6d43df248c7984bf2fa92bcaecc244d41c3aa2
[INFO] running `Command { std: "docker" "start" "-a" "32f305f1e72065af7c2e249f0a6d43df248c7984bf2fa92bcaecc244d41c3aa2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "32f305f1e72065af7c2e249f0a6d43df248c7984bf2fa92bcaecc244d41c3aa2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "32f305f1e72065af7c2e249f0a6d43df248c7984bf2fa92bcaecc244d41c3aa2", kill_on_drop: false }`
[INFO] [stdout] 32f305f1e72065af7c2e249f0a6d43df248c7984bf2fa92bcaecc244d41c3aa2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b8b938ca752c05c20fabc840ab50955af686615919a8b138f91617cef9fb3012
[INFO] running `Command { std: "docker" "start" "-a" "b8b938ca752c05c20fabc840ab50955af686615919a8b138f91617cef9fb3012", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling bit_field v0.10.1
[INFO] [stderr]    Compiling pci_types v0.2.0
[INFO] [stderr]    Compiling libpebble v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(asm, decl_macro, const_generics, unsafe_block_in_unsafe_fn, never_type)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `unsafe_block_in_unsafe_fn` has been stable since 1.52.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `const_generics` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]  --> src/lib.rs:2:29
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(asm, decl_macro, const_generics, unsafe_block_in_unsafe_fn, never_type)]
[INFO] [stdout]   |                             ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout]   = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning 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 `libpebble` due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "b8b938ca752c05c20fabc840ab50955af686615919a8b138f91617cef9fb3012", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b8b938ca752c05c20fabc840ab50955af686615919a8b138f91617cef9fb3012", kill_on_drop: false }`
[INFO] [stdout] b8b938ca752c05c20fabc840ab50955af686615919a8b138f91617cef9fb3012
