[INFO] fetching crate ratchet 1.2.0...
[INFO] documenting ratchet-1.2.0 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate ratchet 1.2.0 into /workspace/builds/worker-20/source
[INFO] validating manifest of crates.io crate ratchet 1.2.0 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ratchet 1.2.0
[INFO] finished tweaking crates.io crate ratchet 1.2.0
[INFO] tweaked toml for crates.io crate ratchet 1.2.0 written to /workspace/builds/worker-20/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2a24bc0f9ab5198ea1f30a13af89ac00cf8daf060b4ca5e5e09ff956d3ad9fa3
[INFO] running `Command { std: "docker" "start" "-a" "2a24bc0f9ab5198ea1f30a13af89ac00cf8daf060b4ca5e5e09ff956d3ad9fa3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2a24bc0f9ab5198ea1f30a13af89ac00cf8daf060b4ca5e5e09ff956d3ad9fa3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2a24bc0f9ab5198ea1f30a13af89ac00cf8daf060b4ca5e5e09ff956d3ad9fa3", kill_on_drop: false }`
[INFO] [stdout] 2a24bc0f9ab5198ea1f30a13af89ac00cf8daf060b4ca5e5e09ff956d3ad9fa3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 457127b2c3ca34c668f03accc8b2ebb7b7666d7d17336b037be09a69d8d04b45
[INFO] running `Command { std: "docker" "start" "-a" "457127b2c3ca34c668f03accc8b2ebb7b7666d7d17336b037be09a69d8d04b45", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]     Checking subtle v1.0.0
[INFO] [stderr]    Compiling clear_on_drop v0.2.4
[INFO] [stderr]     Checking crypto-mac v0.7.0
[INFO] [stderr]     Checking hmac v0.7.1
[INFO] [stderr]     Checking hkdf v0.8.0
[INFO] [stderr]     Checking getrandom v0.1.16
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]  Documenting ratchet v1.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:23:1
[INFO] [stdout]    |
[INFO] [stdout] 23 | #![feature(trusted_len, generator_trait, never_type,)]
[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 `ratchet`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name ratchet 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 clear_on_drop=/opt/rustwide/target/debug/deps/libclear_on_drop-70ccc35dbd2298a1.rmeta --extern digest=/opt/rustwide/target/debug/deps/libdigest-b0ca9fd9aebe59ef.rmeta --extern hkdf=/opt/rustwide/target/debug/deps/libhkdf-27e19d82b48fb7c3.rmeta --extern rand_core=/opt/rustwide/target/debug/deps/librand_core-724e667fa30cc12f.rmeta --cap-lints=warn --crate-version 1.2.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "457127b2c3ca34c668f03accc8b2ebb7b7666d7d17336b037be09a69d8d04b45", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "457127b2c3ca34c668f03accc8b2ebb7b7666d7d17336b037be09a69d8d04b45", kill_on_drop: false }`
[INFO] [stdout] 457127b2c3ca34c668f03accc8b2ebb7b7666d7d17336b037be09a69d8d04b45
