[INFO] fetching crate dumbnet 0.1.0...
[INFO] documenting dumbnet-0.1.0 against 1.69.0 for beta-1.70-rustdoc-1
[INFO] extracting crate dumbnet 0.1.0 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate dumbnet 0.1.0 on toolchain 1.69.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.69.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate dumbnet 0.1.0
[INFO] finished tweaking crates.io crate dumbnet 0.1.0
[INFO] tweaked toml for crates.io crate dumbnet 0.1.0 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate crates.io crate dumbnet 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.69.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded clicolors-control v1.0.1
[INFO] [stderr]   Downloaded indicatif v0.13.0
[INFO] [stderr]   Downloaded getrandom v0.1.13
[INFO] [stderr]   Downloaded termios v0.3.1
[INFO] [stderr]   Downloaded console v0.9.1
[INFO] [stderr]   Downloaded bincode v1.2.1
[INFO] [stderr]   Downloaded gnuplot v0.0.32
[INFO] [stderr]   Downloaded rand v0.7.2
[INFO] [stderr]   Downloaded syn v1.0.11
[INFO] [stderr]   Downloaded numeric-array v0.4.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fae6a0b21937c91d8e2687f97d31f799750c88ac0d25352c0e869dad9161c143
[INFO] running `Command { std: "docker" "start" "-a" "fae6a0b21937c91d8e2687f97d31f799750c88ac0d25352c0e869dad9161c143", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fae6a0b21937c91d8e2687f97d31f799750c88ac0d25352c0e869dad9161c143", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fae6a0b21937c91d8e2687f97d31f799750c88ac0d25352c0e869dad9161c143", kill_on_drop: false }`
[INFO] [stdout] fae6a0b21937c91d8e2687f97d31f799750c88ac0d25352c0e869dad9161c143
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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" "RUSTFLAGS=--cap-lints=warn" "-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e03cac0cb41c42b8e355d6c32d6ef8cd2f0e40e194112a47352dce54b679b872
[INFO] running `Command { std: "docker" "start" "-a" "e03cac0cb41c42b8e355d6c32d6ef8cd2f0e40e194112a47352dce54b679b872", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling getrandom v0.1.13
[INFO] [stderr]    Compiling proc-macro2 v1.0.6
[INFO] [stderr]    Compiling serde v1.0.104
[INFO] [stderr]    Compiling typenum v1.11.2
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling autocfg v0.1.7
[INFO] [stderr]    Compiling syn v1.0.11
[INFO] [stderr]     Checking ppv-lite86 v0.2.6
[INFO] [stderr]     Checking either v1.5.3
[INFO] [stderr]     Checking itertools v0.8.2
[INFO] [stderr]    Compiling num-traits v0.2.10
[INFO] [stderr]     Checking c2-chacha v0.2.3
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking rand v0.7.2
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]     Checking generic-array v0.13.2
[INFO] [stderr]     Checking numeric-array v0.4.2
[INFO] [stderr]  Documenting dumbnet 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:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(trait_alias)]
[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 document `dumbnet`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name dumbnet src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=6d50f51d17d4ea82 -L dependency=/opt/rustwide/target/debug/deps --extern generic_array=/opt/rustwide/target/debug/deps/libgeneric_array-4436f7f201377a61.rmeta --extern getrandom=/opt/rustwide/target/debug/deps/libgetrandom-9f4db295f1dc80b1.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-0620b5eda1d00bf5.rmeta --extern numeric_array=/opt/rustwide/target/debug/deps/libnumeric_array-b35c4c531fd63e91.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-8cd3f0d97fca2a9e.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-6e628ae2b324ef01.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-0d53128b095cef3d.so --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "e03cac0cb41c42b8e355d6c32d6ef8cd2f0e40e194112a47352dce54b679b872", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e03cac0cb41c42b8e355d6c32d6ef8cd2f0e40e194112a47352dce54b679b872", kill_on_drop: false }`
[INFO] [stdout] e03cac0cb41c42b8e355d6c32d6ef8cd2f0e40e194112a47352dce54b679b872
