[INFO] fetching crate external_mixin_umbrella 0.0.2...
[INFO] documenting external_mixin_umbrella-0.0.2 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate external_mixin_umbrella 0.0.2 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate external_mixin_umbrella 0.0.2 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 external_mixin_umbrella 0.0.2
[INFO] removed path dependency external_mixin from crates.io crate external_mixin_umbrella 0.0.2
[INFO] removed path dependency rust_mixin from crates.io crate external_mixin_umbrella 0.0.2
[INFO] finished tweaking crates.io crate external_mixin_umbrella 0.0.2
[INFO] tweaked toml for crates.io crate external_mixin_umbrella 0.0.2 written to /workspace/builds/worker-12/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]  Downloading crates ...
[INFO] [stderr]   Downloaded external_mixin_umbrella v0.0.2
[INFO] [stderr]   Downloaded rust_mixin v0.0.1
[INFO] [stderr]   Downloaded external_mixin v0.0.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 140d7a415eae3bf441206c2d92a4b688c9b45a3e2cb38733e7cfe1a4f972dbdd
[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" "140d7a415eae3bf441206c2d92a4b688c9b45a3e2cb38733e7cfe1a4f972dbdd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "140d7a415eae3bf441206c2d92a4b688c9b45a3e2cb38733e7cfe1a4f972dbdd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "140d7a415eae3bf441206c2d92a4b688c9b45a3e2cb38733e7cfe1a4f972dbdd", kill_on_drop: false }`
[INFO] [stdout] 140d7a415eae3bf441206c2d92a4b688c9b45a3e2cb38733e7cfe1a4f972dbdd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 332d9ee18aeed8ce085de7a9b6306814767415ce12dc1cbcd9198a6a678ddcf0
[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" "332d9ee18aeed8ce085de7a9b6306814767415ce12dc1cbcd9198a6a678ddcf0", kill_on_drop: false }`
[INFO] [stderr]  Documenting external_mixin_umbrella v0.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(quote, plugin_registrar, rustc_private)]
[INFO] [stdout]   |            ^^^^^ feature has been removed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0463]: can't find crate for `syntax`
[INFO] [stdout]  --> src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | extern crate syntax;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `external_mixin_umbrella`.
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] Some errors have detailed explanations: E0463, E0557.
[INFO] [stdout] 
[INFO] [stderr] Caused by:
[INFO] [stdout] For more information about an error, try `rustc --explain E0463`.
[INFO] [stdout] 
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name external_mixin_umbrella src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --cap-lints=warn --crate-version 0.0.2` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "332d9ee18aeed8ce085de7a9b6306814767415ce12dc1cbcd9198a6a678ddcf0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "332d9ee18aeed8ce085de7a9b6306814767415ce12dc1cbcd9198a6a678ddcf0", kill_on_drop: false }`
[INFO] [stdout] 332d9ee18aeed8ce085de7a9b6306814767415ce12dc1cbcd9198a6a678ddcf0