[INFO] fetching crate regex_macros 0.2.0...
[INFO] documenting regex_macros-0.2.0 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate regex_macros 0.2.0 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate regex_macros 0.2.0 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate regex_macros 0.2.0
[INFO] removed 1 missing tests
[INFO] removed path dependency regex from crates.io crate regex_macros 0.2.0
[INFO] removed path dependency regex-syntax from crates.io crate regex_macros 0.2.0
[INFO] finished tweaking crates.io crate regex_macros 0.2.0
[INFO] tweaked toml for crates.io crate regex_macros 0.2.0 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "+1.47.0" "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] 0740df4abd9a093ca7a8d10955b4f2e3ab66185ebbe03a8c92e5aac8f1d6975d
[INFO] running `Command { std: "docker" "start" "-a" "0740df4abd9a093ca7a8d10955b4f2e3ab66185ebbe03a8c92e5aac8f1d6975d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0740df4abd9a093ca7a8d10955b4f2e3ab66185ebbe03a8c92e5aac8f1d6975d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0740df4abd9a093ca7a8d10955b4f2e3ab66185ebbe03a8c92e5aac8f1d6975d", kill_on_drop: false }`
[INFO] [stdout] 0740df4abd9a093ca7a8d10955b4f2e3ab66185ebbe03a8c92e5aac8f1d6975d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "+1.47.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fb4382cb779113c8cffce5110d2dfb451f5df00162dab9ebb482ca66cd30723f
[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" "fb4382cb779113c8cffce5110d2dfb451f5df00162dab9ebb482ca66cd30723f", kill_on_drop: false }`
[INFO] [stderr]    Compiling regex v0.2.11
[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/regex-0.2.11/src/lib.rs:522:34
[INFO] [stdout]     |
[INFO] [stdout] 522 | #![cfg_attr(feature = "pattern", feature(pattern))]
[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 `regex`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "fb4382cb779113c8cffce5110d2dfb451f5df00162dab9ebb482ca66cd30723f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb4382cb779113c8cffce5110d2dfb451f5df00162dab9ebb482ca66cd30723f", kill_on_drop: false }`
[INFO] [stdout] fb4382cb779113c8cffce5110d2dfb451f5df00162dab9ebb482ca66cd30723f
