[INFO] crate taikai 0.1.0 is already in cache
[INFO] documenting taikai-0.1.0 against try#66dfc4e010913fbed0c4ea91fc2c010004b0f441 for pr-73566
[INFO] extracting crate taikai 0.1.0 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate taikai 0.1.0 on toolchain 66dfc4e010913fbed0c4ea91fc2c010004b0f441
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+66dfc4e010913fbed0c4ea91fc2c010004b0f441" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate taikai 0.1.0
[INFO] finished tweaking crates.io crate taikai 0.1.0
[INFO] tweaked toml for crates.io crate taikai 0.1.0 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+66dfc4e010913fbed0c4ea91fc2c010004b0f441" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+66dfc4e010913fbed0c4ea91fc2c010004b0f441" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+66dfc4e010913fbed0c4ea91fc2c010004b0f441" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f21adc6be721bd055f0b1f7a7d07e08808be10668ae8dcac6008ac246a81d860
[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" "f21adc6be721bd055f0b1f7a7d07e08808be10668ae8dcac6008ac246a81d860", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f21adc6be721bd055f0b1f7a7d07e08808be10668ae8dcac6008ac246a81d860", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f21adc6be721bd055f0b1f7a7d07e08808be10668ae8dcac6008ac246a81d860", kill_on_drop: false }`
[INFO] [stdout] f21adc6be721bd055f0b1f7a7d07e08808be10668ae8dcac6008ac246a81d860
[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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+66dfc4e010913fbed0c4ea91fc2c010004b0f441" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 014659474caea0455fc49aa86c3dfb4a5b55f6eb693c4b2c29da0e57dfa3ea75
[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" "014659474caea0455fc49aa86c3dfb4a5b55f6eb693c4b2c29da0e57dfa3ea75", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.114
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking dtoa v0.4.6
[INFO] [stderr]     Checking itertools v0.7.11
[INFO] [stderr]     Checking proc-macro2 v0.4.30
[INFO] [stderr]    Compiling serde_derive v1.0.114
[INFO] [stderr]     Checking backtrace v0.3.49
[INFO] [stderr]     Checking encoding_rs v0.8.23
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking quote v0.6.13
[INFO] [stderr]     Checking syn v0.15.44
[INFO] [stderr]     Checking serde_yaml v0.8.13
[INFO] [stderr]  Documenting taikai v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/lib.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(custom_attribute)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: removed in favor of `#![register_tool]` and `#![register_attr]`
[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 E0557`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `taikai`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type proc-macro --crate-name taikai 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 encoding_rs=/opt/rustwide/target/debug/deps/libencoding_rs-b6a9a1fdc38dd5ee.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-d24bf09571c3451e.rmeta --extern heck=/opt/rustwide/target/debug/deps/libheck-0fb8bffe17279f91.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-0b10be01be681707.rmeta --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-ae23360b00ab2b8b.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-205ee3420ce6b991.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-8ae523b783554553.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-e9a71ed92117ca52.so --extern serde_yaml=/opt/rustwide/target/debug/deps/libserde_yaml-dfd95f72aae9e45b.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-d383fb6c6db01ed6.rmeta --extern proc_macro --cap-lints=forbid` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "014659474caea0455fc49aa86c3dfb4a5b55f6eb693c4b2c29da0e57dfa3ea75", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "014659474caea0455fc49aa86c3dfb4a5b55f6eb693c4b2c29da0e57dfa3ea75", kill_on_drop: false }`
[INFO] [stdout] 014659474caea0455fc49aa86c3dfb4a5b55f6eb693c4b2c29da0e57dfa3ea75