[INFO] cloning repository https://github.com/Geal/generator_nom
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Geal/generator_nom" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGeal%2Fgenerator_nom", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGeal%2Fgenerator_nom'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b7ac3c969ea2ec78bb5b735c2611959b2baaef0e
[INFO] documenting Geal/generator_nom against 1.54.0 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGeal%2Fgenerator_nom" "/workspace/builds/worker-15/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-15/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Geal/generator_nom 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 git repo https://github.com/Geal/generator_nom
[INFO] finished tweaking git repo https://github.com/Geal/generator_nom
[INFO] tweaked toml for git repo https://github.com/Geal/generator_nom written to /workspace/builds/worker-15/source/Cargo.toml
[INFO] crate git repo https://github.com/Geal/generator_nom already has a lockfile, it will not be regenerated
[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]     Updating git repository `https://github.com/sozu-proxy/circular`
[INFO] [stderr]     Updating git repository `https://github.com/rust-av/flavors`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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] 1d95de6129a361a07043c6ac8555de3e57280f65ae1b49f0d77a51d3c1c19e5b
[INFO] running `Command { std: "docker" "start" "-a" "1d95de6129a361a07043c6ac8555de3e57280f65ae1b49f0d77a51d3c1c19e5b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1d95de6129a361a07043c6ac8555de3e57280f65ae1b49f0d77a51d3c1c19e5b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1d95de6129a361a07043c6ac8555de3e57280f65ae1b49f0d77a51d3c1c19e5b", kill_on_drop: false }`
[INFO] [stdout] 1d95de6129a361a07043c6ac8555de3e57280f65ae1b49f0d77a51d3c1c19e5b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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] 8cf6b848b75020bce85ba3658c5a3383ebe3b1aa9570f7d159a536dd2db24242
[INFO] running `Command { std: "docker" "start" "-a" "8cf6b848b75020bce85ba3658c5a3383ebe3b1aa9570f7d159a536dd2db24242", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking libc v0.2.30
[INFO] [stderr]     Checking circular v0.2.0 (https://github.com/sozu-proxy/circular#3f4a7b6c)
[INFO] [stderr]     Checking memchr v1.0.1
[INFO] [stderr]     Checking nom v3.2.0
[INFO] [stderr]     Checking flavors v0.2.0 (https://github.com/rust-av/flavors#a210b120)
[INFO] [stderr]  Documenting generator_nom v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(generators, generator_trait)]
[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 `generator_nom`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name generator_nom src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern circular=/opt/rustwide/target/debug/deps/libcircular-113abf21cf2c9bce.rmeta --extern flavors=/opt/rustwide/target/debug/deps/libflavors-e541039b78e8f888.rmeta --extern nom=/opt/rustwide/target/debug/deps/libnom-2d7c031fd26fe50e.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "8cf6b848b75020bce85ba3658c5a3383ebe3b1aa9570f7d159a536dd2db24242", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8cf6b848b75020bce85ba3658c5a3383ebe3b1aa9570f7d159a536dd2db24242", kill_on_drop: false }`
[INFO] [stdout] 8cf6b848b75020bce85ba3658c5a3383ebe3b1aa9570f7d159a536dd2db24242
