[INFO] fetching crate noria-mir 0.6.0...
[INFO] documenting noria-mir-0.6.0 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate noria-mir 0.6.0 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate noria-mir 0.6.0 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 noria-mir 0.6.0
[INFO] finished tweaking crates.io crate noria-mir 0.6.0
[INFO] tweaked toml for crates.io crate noria-mir 0.6.0 written to /workspace/builds/worker-9/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded mysql_common v0.22.2
[INFO] [stderr]   Downloaded hashbag v0.1.3
[INFO] [stderr]   Downloaded noria v0.6.1
[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: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] f59d6fa8efae505809845bdcc3aa5700b6783714f6477f18ae459234bec951ac
[INFO] running `Command { std: "docker" "start" "-a" "f59d6fa8efae505809845bdcc3aa5700b6783714f6477f18ae459234bec951ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f59d6fa8efae505809845bdcc3aa5700b6783714f6477f18ae459234bec951ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f59d6fa8efae505809845bdcc3aa5700b6783714f6477f18ae459234bec951ac", kill_on_drop: false }`
[INFO] [stdout] f59d6fa8efae505809845bdcc3aa5700b6783714f6477f18ae459234bec951ac
[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" "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] 3122b14ad496d9e1b6f2069e6d3c3f6dec403a68c4bbb26bcd907fda65c08e0f
[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" "3122b14ad496d9e1b6f2069e6d3c3f6dec403a68c4bbb26bcd907fda65c08e0f", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]    Compiling static_assertions v1.1.0
[INFO] [stderr]     Checking tower-layer v0.3.0
[INFO] [stderr]     Checking snowflake v1.3.0
[INFO] [stderr]     Checking hashbag v0.1.3
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]     Checking tower-make v0.3.0
[INFO] [stderr]     Checking timekeeper v0.3.2
[INFO] [stderr]     Checking assert_infrequent v0.1.0
[INFO] [stderr]     Checking mio-extras v2.0.6
[INFO] [stderr]    Compiling zookeeper_derive v0.4.1
[INFO] [stderr]    Compiling libz-sys v1.1.2
[INFO] [stderr]    Compiling jemalloc-sys v0.3.2
[INFO] [stderr]     Checking tokio v0.2.22
[INFO] [stderr]     Checking lexical v5.2.0
[INFO] [stderr]     Checking tracing v0.1.21
[INFO] [stderr]     Checking futures-util v0.3.6
[INFO] [stderr]     Checking tower-discover v0.3.0
[INFO] [stderr]    Compiling lexical-core v0.7.4
[INFO] [stderr]     Checking twox-hash v1.6.0
[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/assert_infrequent-0.1.0/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking tempfile v3.1.0
[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]    Compiling clang-sys v0.29.3
[INFO] [stderr] error: could not compile `assert_infrequent`.
[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" "3122b14ad496d9e1b6f2069e6d3c3f6dec403a68c4bbb26bcd907fda65c08e0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3122b14ad496d9e1b6f2069e6d3c3f6dec403a68c4bbb26bcd907fda65c08e0f", kill_on_drop: false }`
[INFO] [stdout] 3122b14ad496d9e1b6f2069e6d3c3f6dec403a68c4bbb26bcd907fda65c08e0f
