[INFO] fetching crate ownership_traits 0.5.6...
[INFO] testing ownership_traits-0.5.6 against 1.99.0-beta.8+cargoflags=--release for beta-release-1.100-2
[INFO] extracting crate ownership_traits 0.5.6 into /workspace/builds/worker-7-tc1/source
[INFO] started tweaking crates.io crate ownership_traits 0.5.6
[INFO] finished tweaking crates.io crate ownership_traits 0.5.6
[INFO] tweaked toml for crates.io crate ownership_traits 0.5.6 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate ownership_traits 0.5.6 on toolchain 1.99.0-beta.8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate ownership_traits 0.5.6 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" "+1.99.0-beta.8" "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/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:77db811e55d90add9212f6832c23229e3de5f1c1f9905e8cb07319ea15df73ac" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] f07c8da7a5e8b9ece7aa71e1c1e25e0586291137b3d1e15b541a2b109d97017b
[INFO] running `Command { std: "docker" "start" "f07c8da7a5e8b9ece7aa71e1c1e25e0586291137b3d1e15b541a2b109d97017b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f07c8da7a5e8b9ece7aa71e1c1e25e0586291137b3d1e15b541a2b109d97017b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "f07c8da7a5e8b9ece7aa71e1c1e25e0586291137b3d1e15b541a2b109d97017b" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f07c8da7a5e8b9ece7aa71e1c1e25e0586291137b3d1e15b541a2b109d97017b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "f07c8da7a5e8b9ece7aa71e1c1e25e0586291137b3d1e15b541a2b109d97017b" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "build" "--frozen" "--message-format=json" "--release", kill_on_drop: false }`
[INFO] [stderr]    Compiling ownership_traits v0.5.6 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(allocator_api)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `PhantomData`
[INFO] [stdout]   --> src/lib.rs:35:30
[INFO] [stdout]    |
[INFO] [stdout] 35 | use core::marker::{Destruct, PhantomData, Unsize};
[INFO] [stdout]    |                              ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::num::niche_types::UsizeNoHighBit`
[INFO] [stdout]   --> src/lib.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 37 | use core::num::niche_types::UsizeNoHighBit;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `RefUnwindSafe`
[INFO] [stdout]   --> src/lib.rs:39:19
[INFO] [stdout]    |
[INFO] [stdout] 39 | use core::panic::{RefUnwindSafe, UnwindSafe};
[INFO] [stdout]    |                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `IterMut` and `Iter`
[INFO] [stdout]   --> src/lib.rs:42:19
[INFO] [stdout]    |
[INFO] [stdout] 42 | use core::slice::{Iter, IterMut};
[INFO] [stdout]    |                   ^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ownership_traits` (lib) due to 1 previous error; 4 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "f07c8da7a5e8b9ece7aa71e1c1e25e0586291137b3d1e15b541a2b109d97017b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f07c8da7a5e8b9ece7aa71e1c1e25e0586291137b3d1e15b541a2b109d97017b", kill_on_drop: false }`
[INFO] [stdout] f07c8da7a5e8b9ece7aa71e1c1e25e0586291137b3d1e15b541a2b109d97017b
