[INFO] fetching crate deferred-reference 0.1.2...
[INFO] testing deferred-reference-0.1.2 against 1.76.0 for beta-1.77-1
[INFO] extracting crate deferred-reference 0.1.2 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate deferred-reference 0.1.2 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 deferred-reference 0.1.2
[INFO] finished tweaking crates.io crate deferred-reference 0.1.2
[INFO] tweaked toml for crates.io crate deferred-reference 0.1.2 written to /workspace/builds/worker-2-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-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 59e5d899578272e02f18efc9302708eb30e7aa953b443d03f8bb7e5247a56be5
[INFO] running `Command { std: "docker" "start" "-a" "59e5d899578272e02f18efc9302708eb30e7aa953b443d03f8bb7e5247a56be5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "59e5d899578272e02f18efc9302708eb30e7aa953b443d03f8bb7e5247a56be5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "59e5d899578272e02f18efc9302708eb30e7aa953b443d03f8bb7e5247a56be5", kill_on_drop: false }`
[INFO] [stdout] 59e5d899578272e02f18efc9302708eb30e7aa953b443d03f8bb7e5247a56be5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 6b5dd10550d820cabf9d8f50432eb1dc4ad185407dcaf6cb588e8e6e37e4b4e5
[INFO] running `Command { std: "docker" "start" "-a" "6b5dd10550d820cabf9d8f50432eb1dc4ad185407dcaf6cb588e8e6e37e4b4e5", kill_on_drop: false }`
[INFO] [stderr]    Compiling deferred-reference v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `core_traits_impl::*`
[INFO] [stdout]    --> src/lib.rs:144:9
[INFO] [stdout]     |
[INFO] [stdout] 144 | pub use core_traits_impl::*;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `slice_like_impl::*`
[INFO] [stdout]    --> src/lib.rs:165:9
[INFO] [stdout]     |
[INFO] [stdout] 165 | pub use slice_like_impl::*;
[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:122:48
[INFO] [stdout]     |
[INFO] [stdout] 122 | #![cfg_attr(feature = "slice_ptr_len", feature(slice_ptr_len))]
[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:126:49
[INFO] [stdout]     |
[INFO] [stdout] 126 | #![cfg_attr(feature = "coerce_unsized", feature(coerce_unsized))]
[INFO] [stdout]     |                                                 ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 2 warnings 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 `deferred-reference` (lib) due to 3 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "6b5dd10550d820cabf9d8f50432eb1dc4ad185407dcaf6cb588e8e6e37e4b4e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b5dd10550d820cabf9d8f50432eb1dc4ad185407dcaf6cb588e8e6e37e4b4e5", kill_on_drop: false }`
[INFO] [stdout] 6b5dd10550d820cabf9d8f50432eb1dc4ad185407dcaf6cb588e8e6e37e4b4e5
