[INFO] fetching crate newport_core 0.0.1...
[INFO] testing newport_core-0.0.1 against 1.76.0 for beta-1.77-1
[INFO] extracting crate newport_core 0.0.1 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate newport_core 0.0.1 on toolchain 1.76.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate newport_core 0.0.1
[INFO] finished tweaking crates.io crate newport_core 0.0.1
[INFO] tweaked toml for crates.io crate newport_core 0.0.1 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.76.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f3a856e9f28f6619cf3a799b92bc4a88c51ebf49db7467143992cc2997089498
[INFO] running `Command { std: "docker" "start" "-a" "f3a856e9f28f6619cf3a799b92bc4a88c51ebf49db7467143992cc2997089498", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f3a856e9f28f6619cf3a799b92bc4a88c51ebf49db7467143992cc2997089498", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f3a856e9f28f6619cf3a799b92bc4a88c51ebf49db7467143992cc2997089498", kill_on_drop: false }`
[INFO] [stdout] f3a856e9f28f6619cf3a799b92bc4a88c51ebf49db7467143992cc2997089498
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.76.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 232dfa955623ef4ccef00f75277dc714ab17e0c1c832044b562077b08f7b52ef
[INFO] running `Command { std: "docker" "start" "-a" "232dfa955623ef4ccef00f75277dc714ab17e0c1c832044b562077b08f7b52ef", kill_on_drop: false }`
[INFO] [stderr]    Compiling newport_core v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(trait_alias)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 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 `newport_core` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "232dfa955623ef4ccef00f75277dc714ab17e0c1c832044b562077b08f7b52ef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "232dfa955623ef4ccef00f75277dc714ab17e0c1c832044b562077b08f7b52ef", kill_on_drop: false }`
[INFO] [stdout] 232dfa955623ef4ccef00f75277dc714ab17e0c1c832044b562077b08f7b52ef
