[INFO] fetching crate tdn 0.1.0...
[INFO] documenting tdn-0.1.0 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate tdn 0.1.0 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate tdn 0.1.0 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 crates.io crate tdn 0.1.0
[INFO] finished tweaking crates.io crate tdn 0.1.0
[INFO] tweaked toml for crates.io crate tdn 0.1.0 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate crates.io crate tdn 0.1.0 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] f83e8143b804a7d7358b8f39de9199994ce19be1524200614e1b713748f3c482
[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" "f83e8143b804a7d7358b8f39de9199994ce19be1524200614e1b713748f3c482", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f83e8143b804a7d7358b8f39de9199994ce19be1524200614e1b713748f3c482", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f83e8143b804a7d7358b8f39de9199994ce19be1524200614e1b713748f3c482", kill_on_drop: false }`
[INFO] [stdout] f83e8143b804a7d7358b8f39de9199994ce19be1524200614e1b713748f3c482
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] f456b285d44b0bca6b5c9b7e51430ad6ad4928037fe9209453d7bc0d0e5a0c09
[INFO] running `Command { std: "docker" "start" "-a" "f456b285d44b0bca6b5c9b7e51430ad6ad4928037fe9209453d7bc0d0e5a0c09", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.31
[INFO] [stderr]     Checking scoped-tls-hkt v0.1.2
[INFO] [stderr]     Checking bit-vec v0.6.2
[INFO] [stderr]    Compiling clear_on_drop v0.2.4
[INFO] [stderr]     Checking input_buffer v0.3.1
[INFO] [stderr]     Checking http v0.2.1
[INFO] [stderr]     Checking generic-array v0.14.1
[INFO] [stderr]     Checking fxhash v0.2.1
[INFO] [stderr]     Checking socket2 v0.3.12
[INFO] [stderr]     Checking fs2 v0.4.3
[INFO] [stderr]     Checking kv-log-macro v1.0.6
[INFO] [stderr]     Checking dirs v2.0.2
[INFO] [stderr]     Checking sha-1 v0.8.2
[INFO] [stderr]     Checking sha2 v0.8.2
[INFO] [stderr]     Checking sled v0.31.0
[INFO] [stderr]     Checking block-cipher v0.7.1
[INFO] [stderr]     Checking aes-soft v0.4.0
[INFO] [stderr]     Checking block-modes v0.4.0
[INFO] [stderr]     Checking tungstenite v0.10.1
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]    Compiling pin-project-internal v0.4.20
[INFO] [stderr]    Compiling futures-macro v0.3.5
[INFO] [stderr]    Compiling serde_derive v1.0.111
[INFO] [stderr]    Compiling zeroize_derive v1.0.0
[INFO] [stderr]    Compiling async-trait v0.1.35
[INFO] [stderr]     Checking zeroize v1.1.0
[INFO] [stderr]     Checking curve25519-dalek v2.1.0
[INFO] [stderr]     Checking x25519-dalek v0.6.0
[INFO] [stderr]     Checking ed25519-dalek v1.0.0-pre.3
[INFO] [stderr]     Checking pin-project v0.4.20
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking serde v1.0.111
[INFO] [stderr]     Checking piper v0.1.3
[INFO] [stderr]     Checking futures-executor v0.3.5
[INFO] [stderr]     Checking async-tungstenite v0.4.2
[INFO] [stderr]     Checking futures v0.3.5
[INFO] [stderr]     Checking smol v0.1.11
[INFO] [stderr]     Checking async-std v1.6.0
[INFO] [stderr]     Checking bincode v1.2.1
[INFO] [stderr]     Checking toml v0.5.6
[INFO] [stderr]     Checking serde_json v1.0.55
[INFO] [stderr]     Checking rckad v0.0.6
[INFO] [stderr]     Checking chamomile v0.1.1
[INFO] [stderr]  Documenting tdn 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:12:1
[INFO] [stdout]    |
[INFO] [stdout] 12 | #![feature(associated_type_defaults)]
[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 `tdn`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name tdn src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --cfg 'feature="dev"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern async_std=/opt/rustwide/target/debug/deps/libasync_std-50088280be1d9f4c.rmeta --extern async_tungstenite=/opt/rustwide/target/debug/deps/libasync_tungstenite-2c801847a8431a60.rmeta --extern bincode=/opt/rustwide/target/debug/deps/libbincode-1c9ab8e249d6fbbe.rmeta --extern chamomile=/opt/rustwide/target/debug/deps/libchamomile-b384c667f0d9f405.rmeta --extern dirs=/opt/rustwide/target/debug/deps/libdirs-91ad3b87f76826e4.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-621757bbf919fce7.rmeta --extern httparse=/opt/rustwide/target/debug/deps/libhttparse-57ce91faecb09142.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-57a7edc7f441d44c.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-cb420346eef08862.rmeta --extern mime=/opt/rustwide/target/debug/deps/libmime-25d054e954edca2b.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-d0389cda767bfea1.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-dd1068190335e2cb.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-dd36cff6e37f54f2.rmeta --extern sha3=/opt/rustwide/target/debug/deps/libsha3-4810f11c742a9dec.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-4da5fe19b69a90f3.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "f456b285d44b0bca6b5c9b7e51430ad6ad4928037fe9209453d7bc0d0e5a0c09", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f456b285d44b0bca6b5c9b7e51430ad6ad4928037fe9209453d7bc0d0e5a0c09", kill_on_drop: false }`
[INFO] [stdout] f456b285d44b0bca6b5c9b7e51430ad6ad4928037fe9209453d7bc0d0e5a0c09