[INFO] fetching crate cactusref 0.1.1...
[INFO] checking cactusref-0.1.1 against 1.55.0 for beta-1.56-3
[INFO] extracting crate cactusref 0.1.1 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate cactusref 0.1.1 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate cactusref 0.1.1
[INFO] finished tweaking crates.io crate cactusref 0.1.1
[INFO] tweaked toml for crates.io crate cactusref 0.1.1 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] a6f020c2c836e41f680622a32a4e6e1c21447b0fa3cade4716d2b44073608fb5
[INFO] running `Command { std: "docker" "start" "-a" "a6f020c2c836e41f680622a32a4e6e1c21447b0fa3cade4716d2b44073608fb5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a6f020c2c836e41f680622a32a4e6e1c21447b0fa3cade4716d2b44073608fb5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a6f020c2c836e41f680622a32a4e6e1c21447b0fa3cade4716d2b44073608fb5", kill_on_drop: false }`
[INFO] [stdout] a6f020c2c836e41f680622a32a4e6e1c21447b0fa3cade4716d2b44073608fb5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e6e01e4aac1d42cf6a1b2ae33f124308ee2fc4b23ebaf19848d330feb39501d7
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "e6e01e4aac1d42cf6a1b2ae33f124308ee2fc4b23ebaf19848d330feb39501d7", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.30
[INFO] [stderr]    Compiling syn v1.0.80
[INFO] [stderr]     Checking hashbrown v0.11.2
[INFO] [stderr]     Checking rustc-hash v1.1.0
[INFO] [stderr]     Checking env_logger v0.8.4
[INFO] [stderr]     Checking cactusref v0.1.1 (/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(
[INFO] [stdout] 2 | |     allocator_api,
[INFO] [stdout] 3 | |     core_intrinsics,
[INFO] [stdout] 4 | |     dropck_eyepatch,
[INFO] [stdout] 5 | |     set_ptr_value,
[INFO] [stdout] 6 | |     slice_ptr_get
[INFO] [stdout] 7 | | )]
[INFO] [stdout]   | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 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 `cactusref` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "e6e01e4aac1d42cf6a1b2ae33f124308ee2fc4b23ebaf19848d330feb39501d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e6e01e4aac1d42cf6a1b2ae33f124308ee2fc4b23ebaf19848d330feb39501d7", kill_on_drop: false }`
[INFO] [stdout] e6e01e4aac1d42cf6a1b2ae33f124308ee2fc4b23ebaf19848d330feb39501d7
