[INFO] fetching crate randen 0.0.0...
[INFO] documenting randen-0.0.0 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate randen 0.0.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate randen 0.0.0 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 randen 0.0.0
[INFO] finished tweaking crates.io crate randen 0.0.0
[INFO] tweaked toml for crates.io crate randen 0.0.0 written to /workspace/builds/worker-7/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-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] [stdout] f579ed30a9d5a92bd2556ff18d8bb187f9e2bf4c87d81070bd23a08829076e48
[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" "f579ed30a9d5a92bd2556ff18d8bb187f9e2bf4c87d81070bd23a08829076e48", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f579ed30a9d5a92bd2556ff18d8bb187f9e2bf4c87d81070bd23a08829076e48", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f579ed30a9d5a92bd2556ff18d8bb187f9e2bf4c87d81070bd23a08829076e48", kill_on_drop: false }`
[INFO] [stdout] f579ed30a9d5a92bd2556ff18d8bb187f9e2bf4c87d81070bd23a08829076e48
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 1b16b92338fe62868a5558767b6ea3d2c5ca5d91bb1a6b4c4a36c3a143cf97af
[INFO] running `Command { std: "docker" "start" "-a" "1b16b92338fe62868a5558767b6ea3d2c5ca5d91bb1a6b4c4a36c3a143cf97af", kill_on_drop: false }`
[INFO] [stderr]     Checking rand v0.4.6
[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/rand-0.4.6/src/lib.rs:248:39
[INFO] [stdout]     |
[INFO] [stdout] 248 | #![cfg_attr(feature = "i128_support", feature(i128_type, i128))]
[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 `rand`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "1b16b92338fe62868a5558767b6ea3d2c5ca5d91bb1a6b4c4a36c3a143cf97af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1b16b92338fe62868a5558767b6ea3d2c5ca5d91bb1a6b4c4a36c3a143cf97af", kill_on_drop: false }`
[INFO] [stdout] 1b16b92338fe62868a5558767b6ea3d2c5ca5d91bb1a6b4c4a36c3a143cf97af
