[INFO] fetching crate owned-buf 0.3.0...
[INFO] testing owned-buf-0.3.0 against 1.76.0 for beta-1.77-1
[INFO] extracting crate owned-buf 0.3.0 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate owned-buf 0.3.0 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 owned-buf 0.3.0
[INFO] finished tweaking crates.io crate owned-buf 0.3.0
[INFO] tweaked toml for crates.io crate owned-buf 0.3.0 written to /workspace/builds/worker-1-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] 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-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 834637a0f0844b97f0251683c16e5dab00355a64bab8e9751b78ed8182e5ebd3
[INFO] running `Command { std: "docker" "start" "-a" "834637a0f0844b97f0251683c16e5dab00355a64bab8e9751b78ed8182e5ebd3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "834637a0f0844b97f0251683c16e5dab00355a64bab8e9751b78ed8182e5ebd3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "834637a0f0844b97f0251683c16e5dab00355a64bab8e9751b78ed8182e5ebd3", kill_on_drop: false }`
[INFO] [stdout] 834637a0f0844b97f0251683c16e5dab00355a64bab8e9751b78ed8182e5ebd3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 1d9750a0f05c715712fe5f2095073846a49774083b7ff7f4f1f9d709719a71e2
[INFO] running `Command { std: "docker" "start" "-a" "1d9750a0f05c715712fe5f2095073846a49774083b7ff7f4f1f9d709719a71e2", kill_on_drop: false }`
[INFO] [stderr]    Compiling owned-buf v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:107:12
[INFO] [stdout]     |
[INFO] [stdout] 107 | #![feature(maybe_uninit_slice)]
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:108:12
[INFO] [stdout]     |
[INFO] [stdout] 108 | #![feature(maybe_uninit_write_slice)]
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:109:12
[INFO] [stdout]     |
[INFO] [stdout] 109 | #![feature(vec_into_raw_parts)]
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `owned-buf` (lib) due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "1d9750a0f05c715712fe5f2095073846a49774083b7ff7f4f1f9d709719a71e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1d9750a0f05c715712fe5f2095073846a49774083b7ff7f4f1f9d709719a71e2", kill_on_drop: false }`
[INFO] [stdout] 1d9750a0f05c715712fe5f2095073846a49774083b7ff7f4f1f9d709719a71e2
