[INFO] fetching crate unsized-vec 0.0.2-alpha.9...
[INFO] documenting unsized-vec-0.0.2-alpha.9 against 1.75.0 for beta-1.76-rustdoc-1
[INFO] extracting crate unsized-vec 0.0.2-alpha.9 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate unsized-vec 0.0.2-alpha.9 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate unsized-vec 0.0.2-alpha.9
[INFO] finished tweaking crates.io crate unsized-vec 0.0.2-alpha.9
[INFO] tweaked toml for crates.io crate unsized-vec 0.0.2-alpha.9 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate crates.io crate unsized-vec 0.0.2-alpha.9 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded emplacable v0.1.0-alpha.11
[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" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7f289c91dc1998786c9f3989956f302c4e4dd2b5fb24f02f147863605fb73878
[INFO] running `Command { std: "docker" "start" "-a" "7f289c91dc1998786c9f3989956f302c4e4dd2b5fb24f02f147863605fb73878", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7f289c91dc1998786c9f3989956f302c4e4dd2b5fb24f02f147863605fb73878", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7f289c91dc1998786c9f3989956f302c4e4dd2b5fb24f02f147863605fb73878", kill_on_drop: false }`
[INFO] [stdout] 7f289c91dc1998786c9f3989956f302c4e4dd2b5fb24f02f147863605fb73878
[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" "+1.75.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 261e10275acf11c06697a3006d90b43bda796139575d7141481a0f5de8ca334a
[INFO] running `Command { std: "docker" "start" "-a" "261e10275acf11c06697a3006d90b43bda796139575d7141481a0f5de8ca334a", kill_on_drop: false }`
[INFO] [stderr]     Checking emplacable v0.1.0-alpha.11
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/emplacable-0.1.0-alpha.11/src/lib.rs:80:1
[INFO] [stdout]    |
[INFO] [stdout] 80 | / #![feature(
[INFO] [stdout] 81 | |     allocator_api,
[INFO] [stdout] 82 | |     closure_lifetime_binder,
[INFO] [stdout] 83 | |     forget_unsized,
[INFO] [stdout] ...  |
[INFO] [stdout] 91 | |     unsized_fn_params
[INFO] [stdout] 92 | | )]
[INFO] [stdout]    | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/emplacable-0.1.0-alpha.11/src/lib.rs:81:5
[INFO] [stdout]    |
[INFO] [stdout] 81 |     allocator_api,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/emplacable-0.1.0-alpha.11/src/lib.rs:83:5
[INFO] [stdout]    |
[INFO] [stdout] 83 |     forget_unsized,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/emplacable-0.1.0-alpha.11/src/lib.rs:86:5
[INFO] [stdout]    |
[INFO] [stdout] 86 |     ptr_metadata,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/emplacable-0.1.0-alpha.11/src/lib.rs:89:5
[INFO] [stdout]    |
[INFO] [stdout] 89 |     unchecked_math,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/emplacable-0.1.0-alpha.11/src/lib.rs:90:5
[INFO] [stdout]    |
[INFO] [stdout] 90 |     unsize,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 6 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 `emplacable` (lib) due to 7 previous errors
[INFO] running `Command { std: "docker" "inspect" "261e10275acf11c06697a3006d90b43bda796139575d7141481a0f5de8ca334a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "261e10275acf11c06697a3006d90b43bda796139575d7141481a0f5de8ca334a", kill_on_drop: false }`
[INFO] [stdout] 261e10275acf11c06697a3006d90b43bda796139575d7141481a0f5de8ca334a
