[INFO] fetching crate mcai_models 0.0.1...
[INFO] documenting mcai_models-0.0.1 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate mcai_models 0.0.1 into /workspace/builds/worker-63/source
[INFO] validating manifest of crates.io crate mcai_models 0.0.1 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mcai_models 0.0.1
[INFO] finished tweaking crates.io crate mcai_models 0.0.1
[INFO] tweaked toml for crates.io crate mcai_models 0.0.1 written to /workspace/builds/worker-63/source/Cargo.toml
[INFO] crate crates.io crate mcai_models 0.0.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "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-63/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-63/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" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 728ed18ce7ccc83a86ecbeff547554149619f9f06740a1e8e68bbf89bf18d147
[INFO] running `Command { std: "docker" "start" "-a" "728ed18ce7ccc83a86ecbeff547554149619f9f06740a1e8e68bbf89bf18d147", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "728ed18ce7ccc83a86ecbeff547554149619f9f06740a1e8e68bbf89bf18d147", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "728ed18ce7ccc83a86ecbeff547554149619f9f06740a1e8e68bbf89bf18d147", kill_on_drop: false }`
[INFO] [stdout] 728ed18ce7ccc83a86ecbeff547554149619f9f06740a1e8e68bbf89bf18d147
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-63/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-63/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" "+beta-2021-08-01" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 65abaf70e21f5ec571b2e78f6db1ba11f834a115a7b18411fda9813486a065eb
[INFO] running `Command { std: "docker" "start" "-a" "65abaf70e21f5ec571b2e78f6db1ba11f834a115a7b18411fda9813486a065eb", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.48
[INFO] [stderr]    Compiling serde_derive v1.0.117
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]    Compiling serde_json v1.0.59
[INFO] [stderr]    Compiling schemars v0.8.0
[INFO] [stderr]     Checking itoa v0.4.6
[INFO] [stderr]     Checking regex-syntax v0.6.20
[INFO] [stderr]     Checking dyn-clone v1.0.3
[INFO] [stderr]     Checking aho-corasick v0.7.14
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking regex v1.4.1
[INFO] [stderr]    Compiling serde_derive_internals v0.25.0
[INFO] [stderr]    Compiling schemars_derive v0.8.0
[INFO] [stderr]     Checking mcai_models v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting mcai_models v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/bin/mcai-model.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(result_flattening)]
[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 `mcai_models`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name mcai_model src/bin/mcai-model.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-5e37eee3e84fafab.rmeta --extern mcai_models=/opt/rustwide/target/debug/deps/libmcai_models-e8746a032be7f72d.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-3fbc7b526e90942f.rmeta --extern schemars=/opt/rustwide/target/debug/deps/libschemars-37b68a067441d359.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-4ca143540b018f80.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-12a91e39f80d4ea6.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-9d4c770f4f9df7dc.rmeta --cap-lints=warn --crate-version 0.0.1` (exit status: 1)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "65abaf70e21f5ec571b2e78f6db1ba11f834a115a7b18411fda9813486a065eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "65abaf70e21f5ec571b2e78f6db1ba11f834a115a7b18411fda9813486a065eb", kill_on_drop: false }`
[INFO] [stdout] 65abaf70e21f5ec571b2e78f6db1ba11f834a115a7b18411fda9813486a065eb
