[INFO] fetching crate datatest 0.6.3...
[INFO] documenting datatest-0.6.3 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate datatest 0.6.3 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate datatest 0.6.3 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 datatest 0.6.3
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate datatest 0.6.3
[INFO] tweaked toml for crates.io crate datatest 0.6.3 written to /workspace/builds/worker-8/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] 12025df604a7ce999d1a5ccf5bc0c0601f2d101f8f2e1e63c40225fca070dde7
[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" "12025df604a7ce999d1a5ccf5bc0c0601f2d101f8f2e1e63c40225fca070dde7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "12025df604a7ce999d1a5ccf5bc0c0601f2d101f8f2e1e63c40225fca070dde7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "12025df604a7ce999d1a5ccf5bc0c0601f2d101f8f2e1e63c40225fca070dde7", kill_on_drop: false }`
[INFO] [stdout] 12025df604a7ce999d1a5ccf5bc0c0601f2d101f8f2e1e63c40225fca070dde7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] 56927b6386bd52e203648e5cf71708598e16290f00cc43c6d0fa63fec74256e4
[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" "56927b6386bd52e203648e5cf71708598e16290f00cc43c6d0fa63fec74256e4", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling datatest v0.6.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking yaml-rust v0.4.4
[INFO] [stderr]    Compiling ctor v0.1.16
[INFO] [stderr]    Compiling datatest-derive v0.6.3
[INFO] [stderr]     Checking serde_yaml v0.8.13
[INFO] [stderr]  Documenting datatest v0.6.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[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:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(specialization)]
[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:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(termination_trait_lib)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 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 `datatest`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name datatest src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern ctor=/opt/rustwide/target/debug/deps/libctor-28ba15b2a6b4d7a1.so --extern datatest_derive=/opt/rustwide/target/debug/deps/libdatatest_derive-26d87ad6e8b6b1b3.so --extern regex=/opt/rustwide/target/debug/deps/libregex-f7893ea89c3244ad.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-7a48be7d7c854e7f.rmeta --extern serde_yaml=/opt/rustwide/target/debug/deps/libserde_yaml-f9e0be8f47eee6d4.rmeta --extern walkdir=/opt/rustwide/target/debug/deps/libwalkdir-35cbba2d5b8a0a7f.rmeta --extern yaml_rust=/opt/rustwide/target/debug/deps/libyaml_rust-9e95e444906c0ab8.rmeta --cap-lints=warn --crate-version 0.6.3` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "56927b6386bd52e203648e5cf71708598e16290f00cc43c6d0fa63fec74256e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "56927b6386bd52e203648e5cf71708598e16290f00cc43c6d0fa63fec74256e4", kill_on_drop: false }`
[INFO] [stdout] 56927b6386bd52e203648e5cf71708598e16290f00cc43c6d0fa63fec74256e4
