[INFO] fetching crate cache-macro 0.4.1...
[INFO] documenting cache-macro-0.4.1 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate cache-macro 0.4.1 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate cache-macro 0.4.1 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 cache-macro 0.4.1
[INFO] finished tweaking crates.io crate cache-macro 0.4.1
[INFO] tweaked toml for crates.io crate cache-macro 0.4.1 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded expiring_map v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] de1d40c59f54308ad8b8cd08c6b352e0befe2004542b398a49edeb0e4c5eef92
[INFO] running `Command { std: "docker" "start" "-a" "de1d40c59f54308ad8b8cd08c6b352e0befe2004542b398a49edeb0e4c5eef92", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "de1d40c59f54308ad8b8cd08c6b352e0befe2004542b398a49edeb0e4c5eef92", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de1d40c59f54308ad8b8cd08c6b352e0befe2004542b398a49edeb0e4c5eef92", kill_on_drop: false }`
[INFO] [stdout] de1d40c59f54308ad8b8cd08c6b352e0befe2004542b398a49edeb0e4c5eef92
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] 4c002c3d60f007eb63926e421fe5edc15fbebb6b5a6c05811e16d1866b7b0908
[INFO] running `Command { std: "docker" "start" "-a" "4c002c3d60f007eb63926e421fe5edc15fbebb6b5a6c05811e16d1866b7b0908", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]     Checking unicode-xid v0.1.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking quote v0.6.13
[INFO] [stderr]  Documenting cache-macro v0.4.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]    --> src/lib.rs:170:1
[INFO] [stdout]     |
[INFO] [stdout] 170 | #![feature(extern_crate_item_prelude)]
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]     |
[INFO] [stdout]     = help: the feature `extern_crate_item_prelude` has been stable since 1.31.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]    --> src/lib.rs:171:1
[INFO] [stdout]     |
[INFO] [stdout] 171 | #![feature(proc_macro_diagnostic)]
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 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 `cache-macro`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type proc-macro --crate-name cache_macro 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 lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-5e37eee3e84fafab.rmeta --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-31875f54a3e7d9cc.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-b3fc556c1e5be85b.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-11500f37dbc58ea2.rmeta --extern proc_macro --cap-lints=warn --crate-version 0.4.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "4c002c3d60f007eb63926e421fe5edc15fbebb6b5a6c05811e16d1866b7b0908", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c002c3d60f007eb63926e421fe5edc15fbebb6b5a6c05811e16d1866b7b0908", kill_on_drop: false }`
[INFO] [stdout] 4c002c3d60f007eb63926e421fe5edc15fbebb6b5a6c05811e16d1866b7b0908
