[INFO] cloning repository https://github.com/wyhhh/md_engine
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/wyhhh/md_engine" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwyhhh%2Fmd_engine", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwyhhh%2Fmd_engine'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7685828dad6314e2e5e8986a4ae592d7a62e6c5e
[INFO] documenting wyhhh/md_engine against beta-2022-05-20 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwyhhh%2Fmd_engine" "/workspace/builds/worker-33/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-33/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/wyhhh/md_engine on toolchain beta-2022-05-20
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/wyhhh/md_engine
[INFO] finished tweaking git repo https://github.com/wyhhh/md_engine
[INFO] tweaked toml for git repo https://github.com/wyhhh/md_engine written to /workspace/builds/worker-33/source/Cargo.toml
[INFO] crate git repo https://github.com/wyhhh/md_engine already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-33/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-33/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-05-20" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f20a1c842241f966620419c1e7f0a672c1b18c1c96fe4b0ed3f122e8cfda20e9
[INFO] running `Command { std: "docker" "start" "-a" "f20a1c842241f966620419c1e7f0a672c1b18c1c96fe4b0ed3f122e8cfda20e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f20a1c842241f966620419c1e7f0a672c1b18c1c96fe4b0ed3f122e8cfda20e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f20a1c842241f966620419c1e7f0a672c1b18c1c96fe4b0ed3f122e8cfda20e9", kill_on_drop: false }`
[INFO] [stdout] f20a1c842241f966620419c1e7f0a672c1b18c1c96fe4b0ed3f122e8cfda20e9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-33/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-33/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-05-20" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 327006e182f806b3912291cbf56f5d6f75fdfdd920ffb7134e694d80876ddb0a
[INFO] running `Command { std: "docker" "start" "-a" "327006e182f806b3912291cbf56f5d6f75fdfdd920ffb7134e694d80876ddb0a", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.29
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.80
[INFO] [stderr]     Checking chr v0.1.0 (/opt/rustwide/workdir/chr)
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]    Compiling enum_len v0.1.0 (/opt/rustwide/workdir/enum_len)
[INFO] [stderr]  Documenting md_engine v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(trace_macros)]
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not document `md_engine`
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type lib --crate-name md_engine src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=9dd5644d4c05c06b -L dependency=/opt/rustwide/target/debug/deps --extern chr=/opt/rustwide/target/debug/deps/libchr-972e152be5aa0a3a.rmeta --extern enum_len=/opt/rustwide/target/debug/deps/libenum_len-d903fd27bef7ee9a.so --cap-lints=warn --crate-version 1.0.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "327006e182f806b3912291cbf56f5d6f75fdfdd920ffb7134e694d80876ddb0a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "327006e182f806b3912291cbf56f5d6f75fdfdd920ffb7134e694d80876ddb0a", kill_on_drop: false }`
[INFO] [stdout] 327006e182f806b3912291cbf56f5d6f75fdfdd920ffb7134e694d80876ddb0a