[INFO] fetching crate pippin 0.1.0...
[INFO] documenting pippin-0.1.0 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate pippin 0.1.0 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate pippin 0.1.0 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 pippin 0.1.0
[INFO] finished tweaking crates.io crate pippin 0.1.0
[INFO] tweaked toml for crates.io crate pippin 0.1.0 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] 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-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] [stdout] e1efd4bcbda1f12f8e02f543314b3108294b53f23177ec2e5503730143482f7e
[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" "e1efd4bcbda1f12f8e02f543314b3108294b53f23177ec2e5503730143482f7e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e1efd4bcbda1f12f8e02f543314b3108294b53f23177ec2e5503730143482f7e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e1efd4bcbda1f12f8e02f543314b3108294b53f23177ec2e5503730143482f7e", kill_on_drop: false }`
[INFO] [stdout] e1efd4bcbda1f12f8e02f543314b3108294b53f23177ec2e5503730143482f7e
[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] 87454e82215dcaab3cc446773d8217ec77e1690cb21a3652b4d065637a33019f
[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" "87454e82215dcaab3cc446773d8217ec77e1690cb21a3652b4d065637a33019f", kill_on_drop: false }`
[INFO] [stderr]     Checking hashindexed v0.1.1
[INFO] [stderr]  Documenting pippin v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:68:1
[INFO] [stdout]    |
[INFO] [stdout] 68 | #![feature(step_by)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:73:1
[INFO] [stdout]    |
[INFO] [stdout] 73 | #![feature(box_syntax)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 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 `pippin`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name pippin src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-674e0a0dfa4f6cff.rmeta --extern chrono=/opt/rustwide/target/debug/deps/libchrono-9defb8a53da70288.rmeta --extern hashindexed=/opt/rustwide/target/debug/deps/libhashindexed-36b15efd39929cf5.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-7716449a6325aa11.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-e4aa0912053fc98e.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-3b6d445af76d8f13.rmeta --extern crypto=/opt/rustwide/target/debug/deps/libcrypto-cd8a4b3a921d3ef5.rmeta --extern vec_map=/opt/rustwide/target/debug/deps/libvec_map-11dca5f7feff7329.rmeta --extern walkdir=/opt/rustwide/target/debug/deps/libwalkdir-9caeb93a326f24a5.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "87454e82215dcaab3cc446773d8217ec77e1690cb21a3652b4d065637a33019f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "87454e82215dcaab3cc446773d8217ec77e1690cb21a3652b4d065637a33019f", kill_on_drop: false }`
[INFO] [stdout] 87454e82215dcaab3cc446773d8217ec77e1690cb21a3652b4d065637a33019f
