[INFO] cloning repository https://github.com/FrozenDroid/serialmonitor-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/FrozenDroid/serialmonitor-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFrozenDroid%2Fserialmonitor-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFrozenDroid%2Fserialmonitor-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 82625c794fc9bb30fc24a2817f1c67f186bfbba8
[INFO] documenting FrozenDroid/serialmonitor-rust against 1.46.0 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFrozenDroid%2Fserialmonitor-rust" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/FrozenDroid/serialmonitor-rust on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/FrozenDroid/serialmonitor-rust
[INFO] finished tweaking git repo https://github.com/FrozenDroid/serialmonitor-rust
[INFO] tweaked toml for git repo https://github.com/FrozenDroid/serialmonitor-rust written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/FrozenDroid/serialmonitor-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c0ddb90f8bed8f83a8a0333d4a8a850b9038608ba654179a4586ae56b9d38479
[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" "c0ddb90f8bed8f83a8a0333d4a8a850b9038608ba654179a4586ae56b9d38479", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c0ddb90f8bed8f83a8a0333d4a8a850b9038608ba654179a4586ae56b9d38479", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c0ddb90f8bed8f83a8a0333d4a8a850b9038608ba654179a4586ae56b9d38479", kill_on_drop: false }`
[INFO] [stdout] c0ddb90f8bed8f83a8a0333d4a8a850b9038608ba654179a4586ae56b9d38479
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 55dec2b6c8d5fb25f3ec52f585fd8d51dd5c00b7e4d35ea22e2c959a5ad4adc2
[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" "55dec2b6c8d5fb25f3ec52f585fd8d51dd5c00b7e4d35ea22e2c959a5ad4adc2", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking libc v0.2.36
[INFO] [stderr]     Checking byteorder v1.2.1
[INFO] [stderr]    Compiling cairo-rs v0.3.0
[INFO] [stderr]    Compiling gio v0.3.0
[INFO] [stderr]     Checking futures v0.1.18
[INFO] [stderr]    Compiling gdk-pixbuf v0.3.0
[INFO] [stderr]    Compiling gdk v0.7.0
[INFO] [stderr]     Checking slab v0.4.0
[INFO] [stderr]    Compiling lazy_static v1.0.0
[INFO] [stderr]    Compiling utf8-ranges v1.0.0
[INFO] [stderr]    Compiling gtk v0.3.0
[INFO] [stderr]     Checking log v0.4.1
[INFO] [stderr]    Compiling glib-sys v0.5.0
[INFO] [stderr]    Compiling gobject-sys v0.5.0
[INFO] [stderr]    Compiling gio-sys v0.5.0
[INFO] [stderr]    Compiling gdk-pixbuf-sys v0.5.0
[INFO] [stderr]    Compiling cairo-sys-rs v0.5.0
[INFO] [stderr]    Compiling pango-sys v0.5.0
[INFO] [stderr]    Compiling gdk-sys v0.5.0
[INFO] [stderr]    Compiling atk-sys v0.5.0
[INFO] [stderr]    Compiling gtk-sys v0.5.0
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]    Compiling thread_local v0.3.5
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr]     Checking iovec v0.1.2
[INFO] [stderr]     Checking net2 v0.2.31
[INFO] [stderr]    Compiling memchr v2.0.1
[INFO] [stderr]     Checking bytes v0.4.6
[INFO] [stderr]    Compiling aho-corasick v0.6.4
[INFO] [stderr]    Compiling regex v0.2.5
[INFO] [stderr]     Checking glib v0.4.1
[INFO] [stderr]     Checking tokio-io v0.1.4
[INFO] [stderr]     Checking futures-glib v0.3.2
[INFO] [stderr]    Compiling env_logger v0.4.3
[INFO] [stderr]     Checking relm-core v0.11.0
[INFO] [stderr]     Checking relm-state v0.11.0
[INFO] [stderr]    Compiling relm-gen-widget v0.11.0
[INFO] [stderr]     Checking pango v0.3.0
[INFO] [stderr]    Compiling relm-derive-common v0.11.0
[INFO] [stderr]    Compiling relm-derive v0.11.0
[INFO] [stderr]    Compiling relm-attributes v0.11.0
[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/relm-attributes-0.11.0/src/lib.rs:22:1
[INFO] [stdout]    |
[INFO] [stdout] 22 | #![feature(proc_macro)]
[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 `relm-attributes`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "55dec2b6c8d5fb25f3ec52f585fd8d51dd5c00b7e4d35ea22e2c959a5ad4adc2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "55dec2b6c8d5fb25f3ec52f585fd8d51dd5c00b7e4d35ea22e2c959a5ad4adc2", kill_on_drop: false }`
[INFO] [stdout] 55dec2b6c8d5fb25f3ec52f585fd8d51dd5c00b7e4d35ea22e2c959a5ad4adc2