[INFO] fetching crate restruct_derive 0.1.0...
[INFO] documenting restruct_derive-0.1.0 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate restruct_derive 0.1.0 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate restruct_derive 0.1.0 on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate restruct_derive 0.1.0
[INFO] finished tweaking crates.io crate restruct_derive 0.1.0
[INFO] tweaked toml for crates.io crate restruct_derive 0.1.0 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rustc-rayon-core v0.3.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_lexer v669.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_errors v669.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_attr v669.0.0
[INFO] [stderr]   Downloaded annotate-snippets v0.6.1
[INFO] [stderr]   Downloaded rustc-ap-rustc_ast_pretty v669.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_ast v669.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_session v669.0.0
[INFO] [stderr]   Downloaded rustc-workspace-hack v1.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_expand v669.0.0
[INFO] [stderr]   Downloaded ena v0.14.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_index v669.0.0
[INFO] [stderr]   Downloaded termize v0.1.1
[INFO] [stderr]   Downloaded rustc-ap-rustc_arena v669.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_target v669.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_parse v669.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_macros v669.0.0
[INFO] [stderr]   Downloaded rustc-rayon v0.3.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_data_structures v669.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_span v669.0.0
[INFO] [stderr]   Downloaded rustfmt-nightly v1.4.19
[INFO] [stderr]   Downloaded structopt-derive v0.4.10
[INFO] [stderr]   Downloaded restruct v0.1.0
[INFO] [stderr]   Downloaded unicode_categories v0.1.1
[INFO] [stderr]   Downloaded rustc-ap-rustc_graphviz v669.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_feature v669.0.0
[INFO] [stderr]   Downloaded measureme v0.7.1
[INFO] [stderr]   Downloaded rustc-ap-rustc_ast_passes v669.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_fs_util v669.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_serialize v669.0.0
[INFO] [stderr]   Downloaded annotate-snippets v0.8.0
[INFO] [stderr]   Downloaded rustfmt-config_proc_macro v0.2.0
[INFO] [stderr]   Downloaded structopt v0.3.17
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9dd1e2e1e6dd14d4eb471027d3af4f68966269eb021f3f25021a2d384300364c
[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" "9dd1e2e1e6dd14d4eb471027d3af4f68966269eb021f3f25021a2d384300364c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9dd1e2e1e6dd14d4eb471027d3af4f68966269eb021f3f25021a2d384300364c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9dd1e2e1e6dd14d4eb471027d3af4f68966269eb021f3f25021a2d384300364c", kill_on_drop: false }`
[INFO] [stdout] 9dd1e2e1e6dd14d4eb471027d3af4f68966269eb021f3f25021a2d384300364c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 39d110c029343b79e9fb228f3c69a72cf57345b428c2aae2657e61e81095a92f
[INFO] running `Command { std: "docker" "start" "-a" "39d110c029343b79e9fb228f3c69a72cf57345b428c2aae2657e61e81095a92f", kill_on_drop: false }`
[INFO] [stderr]     Checking proc-macro2 v0.4.30
[INFO] [stderr]     Checking quote v0.6.13
[INFO] [stderr]     Checking syn v0.15.44
[INFO] [stderr]     Checking restruct v0.1.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/restruct-0.1.0/src/lib.rs:31:1
[INFO] [stdout]    |
[INFO] [stdout] 31 | #![feature(external_doc)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `restruct`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "39d110c029343b79e9fb228f3c69a72cf57345b428c2aae2657e61e81095a92f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "39d110c029343b79e9fb228f3c69a72cf57345b428c2aae2657e61e81095a92f", kill_on_drop: false }`
[INFO] [stdout] 39d110c029343b79e9fb228f3c69a72cf57345b428c2aae2657e61e81095a92f