[INFO] cloning repository https://github.com/shanegibbs/pirc
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/shanegibbs/pirc" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshanegibbs%2Fpirc", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshanegibbs%2Fpirc'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d89e32b4b34b955b62313bd2e5a7dc03bc71c075
[INFO] documenting shanegibbs/pirc 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%2Fshanegibbs%2Fpirc" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/shanegibbs/pirc 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/shanegibbs/pirc
[INFO] finished tweaking git repo https://github.com/shanegibbs/pirc
[INFO] tweaked toml for git repo https://github.com/shanegibbs/pirc written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/shanegibbs/pirc 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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] 1c45c2284a3499819c7db337eb728adad503de35a2ae7e8dd5bcd5dbac201fcf
[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" "1c45c2284a3499819c7db337eb728adad503de35a2ae7e8dd5bcd5dbac201fcf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1c45c2284a3499819c7db337eb728adad503de35a2ae7e8dd5bcd5dbac201fcf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1c45c2284a3499819c7db337eb728adad503de35a2ae7e8dd5bcd5dbac201fcf", kill_on_drop: false }`
[INFO] [stdout] 1c45c2284a3499819c7db337eb728adad503de35a2ae7e8dd5bcd5dbac201fcf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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] a7ef090978fc4b3391d172441521ab4de770179c808b3dc0864a75e0b98ae053
[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" "a7ef090978fc4b3391d172441521ab4de770179c808b3dc0864a75e0b98ae053", kill_on_drop: false }`
[INFO] [stderr]     Checking cfg-if v0.1.0
[INFO] [stderr]     Checking lazycell v0.4.0
[INFO] [stderr]     Checking rand v0.3.15
[INFO] [stderr]     Checking futures v0.1.10
[INFO] [stderr]     Checking net2 v0.2.26
[INFO] [stderr]     Checking mio v0.6.4
[INFO] [stderr]     Checking tokio-service v0.1.0
[INFO] [stderr]     Checking tokio-core v0.1.4
[INFO] [stderr]     Checking tokio-proto v0.1.0
[INFO] [stderr]  Documenting pirc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(conservative_impl_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `pirc`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name pirc src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern futures=/opt/rustwide/target/debug/deps/libfutures-87596f2ebbb5fb11.rmeta --extern tokio_core=/opt/rustwide/target/debug/deps/libtokio_core-9cf1df704a0f4963.rmeta --extern tokio_proto=/opt/rustwide/target/debug/deps/libtokio_proto-cfdade35af86559a.rmeta --extern tokio_service=/opt/rustwide/target/debug/deps/libtokio_service-e5d2c7d776a7a65a.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "a7ef090978fc4b3391d172441521ab4de770179c808b3dc0864a75e0b98ae053", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a7ef090978fc4b3391d172441521ab4de770179c808b3dc0864a75e0b98ae053", kill_on_drop: false }`
[INFO] [stdout] a7ef090978fc4b3391d172441521ab4de770179c808b3dc0864a75e0b98ae053