[INFO] fetching crate hprose 0.1.0...
[INFO] documenting hprose-0.1.0 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate hprose 0.1.0 into /workspace/builds/worker-48/source
[INFO] validating manifest of crates.io crate hprose 0.1.0 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] started tweaking crates.io crate hprose 0.1.0
[INFO] finished tweaking crates.io crate hprose 0.1.0
[INFO] tweaked toml for crates.io crate hprose 0.1.0 written to /workspace/builds/worker-48/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] [stderr]     Blocking waiting for file lock on package cache
[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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-48/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-48/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] 26a81a78750c5855fb098e84eb594f371fd863973fa368df5a84c583fabb9e2b
[INFO] running `Command { std: "docker" "start" "-a" "26a81a78750c5855fb098e84eb594f371fd863973fa368df5a84c583fabb9e2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "26a81a78750c5855fb098e84eb594f371fd863973fa368df5a84c583fabb9e2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "26a81a78750c5855fb098e84eb594f371fd863973fa368df5a84c583fabb9e2b", kill_on_drop: false }`
[INFO] [stdout] 26a81a78750c5855fb098e84eb594f371fd863973fa368df5a84c583fabb9e2b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-48/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-48/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] 1bcf9e7dc1605b52f27b038df3511eaf27b19138641820d473b0f638b012693e
[INFO] running `Command { std: "docker" "start" "-a" "1bcf9e7dc1605b52f27b038df3511eaf27b19138641820d473b0f638b012693e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking custom_derive v0.1.7
[INFO] [stderr]     Checking uuid v0.3.1
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]     Checking hpack v0.2.0
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking cookie v0.2.5
[INFO] [stderr]     Checking solicit v0.4.4
[INFO] [stderr]     Checking num-bigint v0.1.44
[INFO] [stderr]     Checking num-iter v0.1.42
[INFO] [stderr]     Checking hyper v0.9.18
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]  Documenting hprose v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:20:1
[INFO] [stdout]    |
[INFO] [stdout] 20 | #![feature(specialization)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:21:1
[INFO] [stdout]    |
[INFO] [stdout] 21 | #![feature(test)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 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 `hprose`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name hprose 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 custom_derive=/opt/rustwide/target/debug/deps/libcustom_derive-622c2b1003795c83.rmeta --extern dtoa=/opt/rustwide/target/debug/deps/libdtoa-a3a268ed04c9dfd9.rmeta --extern hyper=/opt/rustwide/target/debug/deps/libhyper-c55b214d68b478fc.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-ebc16c131d4b8acf.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-577ffa6562df8c78.rmeta --extern time=/opt/rustwide/target/debug/deps/libtime-85c243a9e9a9ce48.rmeta --extern uuid=/opt/rustwide/target/debug/deps/libuuid-9cf21e96484dc998.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "1bcf9e7dc1605b52f27b038df3511eaf27b19138641820d473b0f638b012693e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1bcf9e7dc1605b52f27b038df3511eaf27b19138641820d473b0f638b012693e", kill_on_drop: false }`
[INFO] [stdout] 1bcf9e7dc1605b52f27b038df3511eaf27b19138641820d473b0f638b012693e
