[INFO] fetching crate namedarg_rustc_macro 0.1.1474613452...
[INFO] documenting namedarg_rustc_macro-0.1.1474613452 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate namedarg_rustc_macro 0.1.1474613452 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate namedarg_rustc_macro 0.1.1474613452 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 namedarg_rustc_macro 0.1.1474613452
[INFO] removed path dependency namedarg_hack from crates.io crate namedarg_rustc_macro 0.1.1474613452
[INFO] finished tweaking crates.io crate namedarg_rustc_macro 0.1.1474613452
[INFO] tweaked toml for crates.io crate namedarg_rustc_macro 0.1.1474613452 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] warning: unused manifest key: lib.rustc-macro
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded namedarg_hack v0.1.1474613452
[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] aa295a246c86f9f1e713a1486b3068fd98048386a2cbe37e9379b6d4e6c8b22a
[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" "aa295a246c86f9f1e713a1486b3068fd98048386a2cbe37e9379b6d4e6c8b22a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aa295a246c86f9f1e713a1486b3068fd98048386a2cbe37e9379b6d4e6c8b22a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa295a246c86f9f1e713a1486b3068fd98048386a2cbe37e9379b6d4e6c8b22a", kill_on_drop: false }`
[INFO] [stdout] aa295a246c86f9f1e713a1486b3068fd98048386a2cbe37e9379b6d4e6c8b22a
[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] [stdout] 8b08d3ea298e97f93646d0326032e14a125346ecd076a2989d5d19d07ed42ab7
[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" "8b08d3ea298e97f93646d0326032e14a125346ecd076a2989d5d19d07ed42ab7", kill_on_drop: false }`
[INFO] [stderr] warning: unused manifest key: lib.rustc-macro
[INFO] [stderr]    Compiling namedarg_hack v0.1.1474613452
[INFO] [stderr]    Compiling namedarg_rustc_macro v0.1.1474613452 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused closure that must be used
[INFO] [stdout]   --> common-build/set-feature-unless-nightly.rs:14:52
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let is_nightly = stdout.contains("-nightly "); || stdout.contains("-dev ");
[INFO] [stdout]    |                                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: closures are lazy and do nothing unless called
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]  Documenting namedarg_rustc_macro v0.1.1474613452 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0463]: can't find crate for `rustc_macro`
[INFO] [stdout]  --> src/lib.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | extern crate rustc_macro;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
[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 E0463`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `namedarg_rustc_macro`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name namedarg_rustc_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 namedarg_hack=/opt/rustwide/target/debug/deps/libnamedarg_hack-5eca264a81e84d0b.rmeta --cap-lints=warn --crate-version 0.1.1474613452 --cfg 'feature = "force_macros11_mode"'` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "8b08d3ea298e97f93646d0326032e14a125346ecd076a2989d5d19d07ed42ab7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b08d3ea298e97f93646d0326032e14a125346ecd076a2989d5d19d07ed42ab7", kill_on_drop: false }`
[INFO] [stdout] 8b08d3ea298e97f93646d0326032e14a125346ecd076a2989d5d19d07ed42ab7