[INFO] fetching crate rustc-ap-serialize 662.0.0...
[INFO] checking rustc-ap-serialize-662.0.0 against 1.55.0 for beta-1.56-3
[INFO] extracting crate rustc-ap-serialize 662.0.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate rustc-ap-serialize 662.0.0 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 rustc-ap-serialize 662.0.0
[INFO] finished tweaking crates.io crate rustc-ap-serialize 662.0.0
[INFO] tweaked toml for crates.io crate rustc-ap-serialize 662.0.0 written to /workspace/builds/worker-6/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-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] [stdout] d12cf9037a5344a6721a96d544e73337232ae27868a5e2a0049a380026562cbd
[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" "d12cf9037a5344a6721a96d544e73337232ae27868a5e2a0049a380026562cbd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d12cf9037a5344a6721a96d544e73337232ae27868a5e2a0049a380026562cbd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d12cf9037a5344a6721a96d544e73337232ae27868a5e2a0049a380026562cbd", kill_on_drop: false }`
[INFO] [stdout] d12cf9037a5344a6721a96d544e73337232ae27868a5e2a0049a380026562cbd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] ed7c04c261131db023ec25e12784f3c26b2cce7b0ff1f4e07b6dc629720e4bf7
[INFO] running `Command { std: "docker" "start" "-a" "ed7c04c261131db023ec25e12784f3c26b2cce7b0ff1f4e07b6dc629720e4bf7", kill_on_drop: false }`
[INFO] [stderr]     Checking smallvec v1.7.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/smallvec-1.7.0/src/lib.rs:83:37
[INFO] [stdout]    |
[INFO] [stdout] 83 | #![cfg_attr(feature = "may_dangle", feature(dropck_eyepatch))]
[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 `smallvec` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "ed7c04c261131db023ec25e12784f3c26b2cce7b0ff1f4e07b6dc629720e4bf7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ed7c04c261131db023ec25e12784f3c26b2cce7b0ff1f4e07b6dc629720e4bf7", kill_on_drop: false }`
[INFO] [stdout] ed7c04c261131db023ec25e12784f3c26b2cce7b0ff1f4e07b6dc629720e4bf7
