[INFO] cloning repository https://github.com/iovxw/babel
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/iovxw/babel" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiovxw%2Fbabel", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiovxw%2Fbabel'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d01d16153443656cfc54338c07c738aca881a401
[INFO] documenting iovxw/babel 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%2Fiovxw%2Fbabel" "/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/iovxw/babel 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/iovxw/babel
[INFO] finished tweaking git repo https://github.com/iovxw/babel
[INFO] tweaked toml for git repo https://github.com/iovxw/babel written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/iovxw/babel 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]  Downloading crates ...
[INFO] [stderr]   Downloaded ego-tree v0.5.0
[INFO] [stderr]   Downloaded tokio-channel v0.1.0
[INFO] [stderr]   Downloaded lazycell v1.1.0
[INFO] [stderr]   Downloaded cssparser v0.23.10
[INFO] [stderr]   Downloaded actix-web v0.7.7
[INFO] [stderr]   Downloaded atom_syndication v0.6.0
[INFO] [stderr]   Downloaded futures-core-preview v0.3.0-alpha.6
[INFO] [stderr]   Downloaded http v0.1.12
[INFO] [stderr]   Downloaded crossbeam-channel v0.2.5
[INFO] [stderr]   Downloaded termcolor v1.0.3
[INFO] [stderr]   Downloaded cssparser-macros v0.3.4
[INFO] [stderr]   Downloaded futures-io-preview v0.3.0-alpha.6
[INFO] [stderr]   Downloaded pin-utils v0.1.0-alpha.2
[INFO] [stderr]   Downloaded tokio-async-await v0.1.2
[INFO] [stderr]   Downloaded futures-channel-preview v0.3.0-alpha.6
[INFO] [stderr]   Downloaded futures-sink-preview v0.3.0-alpha.6
[INFO] [stderr]   Downloaded quick-xml v0.12.3
[INFO] [stderr]   Downloaded futures-util-preview v0.3.0-alpha.6
[INFO] [stderr]   Downloaded scraper v0.7.0
[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] d5ac86590f04e50ae8d0f5516d23dad166e79cfc65b7132dc53c67ae0fb37fa8
[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" "d5ac86590f04e50ae8d0f5516d23dad166e79cfc65b7132dc53c67ae0fb37fa8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d5ac86590f04e50ae8d0f5516d23dad166e79cfc65b7132dc53c67ae0fb37fa8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d5ac86590f04e50ae8d0f5516d23dad166e79cfc65b7132dc53c67ae0fb37fa8", kill_on_drop: false }`
[INFO] [stdout] d5ac86590f04e50ae8d0f5516d23dad166e79cfc65b7132dc53c67ae0fb37fa8
[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] 94951815b795f4f16090277ee73bfe18252593dc6c7e68fdca3b9bacb96200e0
[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" "94951815b795f4f16090277ee73bfe18252593dc6c7e68fdca3b9bacb96200e0", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.19
[INFO] [stderr]     Checking futures v0.1.24
[INFO] [stderr]     Checking crossbeam-utils v0.5.0
[INFO] [stderr]     Checking nodrop v0.1.12
[INFO] [stderr]     Checking lazycell v1.1.0
[INFO] [stderr]     Checking encoding_index_tests v0.1.4
[INFO] [stderr]    Compiling serde v1.0.78
[INFO] [stderr]     Checking rustc-demangle v0.1.9
[INFO] [stderr]    Compiling string_cache_shared v0.3.0
[INFO] [stderr]    Compiling backtrace v0.2.3
[INFO] [stderr]    Compiling failure_derive v0.1.2
[INFO] [stderr]     Checking either v1.5.0
[INFO] [stderr]     Checking mac v0.1.1
[INFO] [stderr]     Checking precomputed-hash v0.1.1
[INFO] [stderr]    Compiling regex v1.0.5
[INFO] [stderr]     Checking utf-8 v0.7.4
[INFO] [stderr]    Compiling procedural-masquerade v0.1.6
[INFO] [stderr]     Checking linked-hash-map v0.4.2
[INFO] [stderr]    Compiling native-tls v0.2.1
[INFO] [stderr]    Compiling num-traits v0.2.5
[INFO] [stderr]    Compiling derive_builder v0.5.1
[INFO] [stderr]     Checking utf8-ranges v1.0.1
[INFO] [stderr]     Checking indexmap v1.0.1
[INFO] [stderr]     Checking string v0.1.1
[INFO] [stderr]     Checking pin-utils v0.1.0-alpha.2
[INFO] [stderr]     Checking htmlescape v0.3.1
[INFO] [stderr]     Checking termcolor v1.0.3
[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/pin-utils-0.1.0-alpha.2/src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(pin)]
[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 `pin-utils`.
[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" "94951815b795f4f16090277ee73bfe18252593dc6c7e68fdca3b9bacb96200e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "94951815b795f4f16090277ee73bfe18252593dc6c7e68fdca3b9bacb96200e0", kill_on_drop: false }`
[INFO] [stdout] 94951815b795f4f16090277ee73bfe18252593dc6c7e68fdca3b9bacb96200e0