[INFO] fetching crate lru-cache-macros 0.3.1...
[INFO] documenting lru-cache-macros-0.3.1 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate lru-cache-macros 0.3.1 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate lru-cache-macros 0.3.1 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate lru-cache-macros 0.3.1
[INFO] finished tweaking crates.io crate lru-cache-macros 0.3.1
[INFO] tweaked toml for crates.io crate lru-cache-macros 0.3.1 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d41af8e624485180259a7815cc49fcf947f7e57a50545fc3d6d31af170c77fad
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "d41af8e624485180259a7815cc49fcf947f7e57a50545fc3d6d31af170c77fad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d41af8e624485180259a7815cc49fcf947f7e57a50545fc3d6d31af170c77fad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d41af8e624485180259a7815cc49fcf947f7e57a50545fc3d6d31af170c77fad", kill_on_drop: false }`
[INFO] [stdout] d41af8e624485180259a7815cc49fcf947f7e57a50545fc3d6d31af170c77fad
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 17e42ff5b86877f3528c7fc1cc5a6f3de19f42b47a218409d3e03dd9eaaedcbe
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "17e42ff5b86877f3528c7fc1cc5a6f3de19f42b47a218409d3e03dd9eaaedcbe", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking quote v0.6.13
[INFO] [stderr]  Documenting lru-cache-macros v0.3.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:178:1
[INFO] [stdout]     |
[INFO] [stdout] 178 | #![feature(extern_crate_item_prelude)]
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:179:1
[INFO] [stdout]     |
[INFO] [stdout] 179 | #![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 `lru-cache-macros`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type proc-macro --crate-name lru_cache_macros 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-72923b2d9aa06af7.rmeta --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-42b9f02991aae0dd.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-7b5a76131bcd4c91.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-8d9eb9805ef2c3a5.rmeta --extern proc_macro --cap-lints=warn --crate-version 0.3.1` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "17e42ff5b86877f3528c7fc1cc5a6f3de19f42b47a218409d3e03dd9eaaedcbe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "17e42ff5b86877f3528c7fc1cc5a6f3de19f42b47a218409d3e03dd9eaaedcbe", kill_on_drop: false }`
[INFO] [stdout] 17e42ff5b86877f3528c7fc1cc5a6f3de19f42b47a218409d3e03dd9eaaedcbe
