[INFO] fetching crate libalpm-utils 0.0.2...
[INFO] testing libalpm-utils-0.0.2 against 1.49.0 for beta-1.50-1
[INFO] extracting crate libalpm-utils 0.0.2 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate libalpm-utils 0.0.2 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate libalpm-utils 0.0.2
[INFO] finished tweaking crates.io crate libalpm-utils 0.0.2
[INFO] tweaked toml for crates.io crate libalpm-utils 0.0.2 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "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] eb0006cabdee0b971e015e57aac24032febbfb7f3d76d83d0c753256b679c9c0
[INFO] running `Command { std: "docker" "start" "-a" "eb0006cabdee0b971e015e57aac24032febbfb7f3d76d83d0c753256b679c9c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eb0006cabdee0b971e015e57aac24032febbfb7f3d76d83d0c753256b679c9c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb0006cabdee0b971e015e57aac24032febbfb7f3d76d83d0c753256b679c9c0", kill_on_drop: false }`
[INFO] [stdout] eb0006cabdee0b971e015e57aac24032febbfb7f3d76d83d0c753256b679c9c0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--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] 7e4a8e275b23fd2b7effe81752d7ad0ae0e36201e8cc9d3f67bfcf5bb0f18c8f
[INFO] running `Command { std: "docker" "start" "-a" "7e4a8e275b23fd2b7effe81752d7ad0ae0e36201e8cc9d3f67bfcf5bb0f18c8f", kill_on_drop: false }`
[INFO] [stderr]    Compiling nom v2.2.1
[INFO] [stderr]    Compiling libalpm-utils v0.0.2 (/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(trace_macros)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/ini.rs:32:1
[INFO] [stdout]    |
[INFO] [stdout] 32 | /// Matches a header line
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/ini.rs:40:1
[INFO] [stdout]    |
[INFO] [stdout] 40 | /// Matches a key and the '='
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stdout]    |
[INFO] [stdout]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 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 `libalpm-utils`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "7e4a8e275b23fd2b7effe81752d7ad0ae0e36201e8cc9d3f67bfcf5bb0f18c8f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7e4a8e275b23fd2b7effe81752d7ad0ae0e36201e8cc9d3f67bfcf5bb0f18c8f", kill_on_drop: false }`
[INFO] [stdout] 7e4a8e275b23fd2b7effe81752d7ad0ae0e36201e8cc9d3f67bfcf5bb0f18c8f