[INFO] fetching crate json-trait-rs 0.11.0...
[INFO] documenting json-trait-rs-0.11.0 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate json-trait-rs 0.11.0 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate json-trait-rs 0.11.0 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-0/source/rust-toolchain
[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-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ce87b5a89a409d55df77bd12f0da18cb421c9d16a9d91178a30904bd9d35ee75
[INFO] running `Command { std: "docker" "start" "-a" "ce87b5a89a409d55df77bd12f0da18cb421c9d16a9d91178a30904bd9d35ee75", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ce87b5a89a409d55df77bd12f0da18cb421c9d16a9d91178a30904bd9d35ee75", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce87b5a89a409d55df77bd12f0da18cb421c9d16a9d91178a30904bd9d35ee75", kill_on_drop: false }`
[INFO] [stdout] ce87b5a89a409d55df77bd12f0da18cb421c9d16a9d91178a30904bd9d35ee75
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d4eca73341630720962f6da73e1e0d5ee1d72c554dff8e37de8fd98887ff914b
[INFO] running `Command { std: "docker" "start" "-a" "d4eca73341630720962f6da73e1e0d5ee1d72c554dff8e37de8fd98887ff914b", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]     Checking strum v0.21.0
[INFO] [stderr]     Checking join-lazy-fmt v0.9.2
[INFO] [stderr]    Compiling backtrace v0.3.61
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]     Checking object v0.26.0
[INFO] [stderr]    Compiling synstructure v0.12.5
[INFO] [stderr]    Compiling strum_macros v0.21.1
[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 stable 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-064e0fe0f43a4fd8.rmeta --extern join_lazy_fmt=/opt/rustwide/target/debug/deps/libjoin_lazy_fmt-ae3e4cd2ade299cf.rmeta --extern strum=/opt/rustwide/target/debug/deps/libstrum-a08f3cd804d5d373.rmeta --extern strum_macros=/opt/rustwide/target/debug/deps/libstrum_macros-13182235f3a1f351.so --cap-lints=warn --crate-version 0.11.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "d4eca73341630720962f6da73e1e0d5ee1d72c554dff8e37de8fd98887ff914b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d4eca73341630720962f6da73e1e0d5ee1d72c554dff8e37de8fd98887ff914b", kill_on_drop: false }`
[INFO] [stdout] d4eca73341630720962f6da73e1e0d5ee1d72c554dff8e37de8fd98887ff914b
