[INFO] fetching crate json-trait-rs 0.11.0...
[INFO] documenting json-trait-rs-0.11.0 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate json-trait-rs 0.11.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate json-trait-rs 0.11.0 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 json-trait-rs 0.11.0
[INFO] finished tweaking crates.io crate json-trait-rs 0.11.0
[INFO] tweaked toml for crates.io crate json-trait-rs 0.11.0 written to /workspace/builds/worker-7/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 join-lazy-fmt v0.9.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] 654867343ee0acdb6ee261b84a0d9733f3181086c0efd0abbb533ce333567473
[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" "654867343ee0acdb6ee261b84a0d9733f3181086c0efd0abbb533ce333567473", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "654867343ee0acdb6ee261b84a0d9733f3181086c0efd0abbb533ce333567473", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "654867343ee0acdb6ee261b84a0d9733f3181086c0efd0abbb533ce333567473", kill_on_drop: false }`
[INFO] [stdout] 654867343ee0acdb6ee261b84a0d9733f3181086c0efd0abbb533ce333567473
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] e57714d94b0522a3c9c3f909f2745606c12d80bbacf630c196399e8884560fdb
[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" "e57714d94b0522a3c9c3f909f2745606c12d80bbacf630c196399e8884560fdb", kill_on_drop: false }`
[INFO] [stderr]     Checking join-lazy-fmt v0.9.2
[INFO] [stderr]     Checking strum v0.19.2
[INFO] [stderr]    Compiling strum_macros v0.19.2
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]  Documenting json-trait-rs v0.11.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:43:1
[INFO] [stdout]    |
[INFO] [stdout] 43 | #![feature(specialization)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 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 `json-trait-rs`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name json_trait_rs 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 --extern failure=/opt/rustwide/target/debug/deps/libfailure-be2b54addb370e1b.rmeta --extern join_lazy_fmt=/opt/rustwide/target/debug/deps/libjoin_lazy_fmt-b36b7cc02b374968.rmeta --extern strum=/opt/rustwide/target/debug/deps/libstrum-a598e74983bdba8d.rmeta --extern strum_macros=/opt/rustwide/target/debug/deps/libstrum_macros-14479ecbdea5ffae.so --cap-lints=warn --crate-version 0.11.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "e57714d94b0522a3c9c3f909f2745606c12d80bbacf630c196399e8884560fdb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e57714d94b0522a3c9c3f909f2745606c12d80bbacf630c196399e8884560fdb", kill_on_drop: false }`
[INFO] [stdout] e57714d94b0522a3c9c3f909f2745606c12d80bbacf630c196399e8884560fdb