[INFO] fetching crate hprose 0.1.0...
[INFO] documenting hprose-0.1.0 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate hprose 0.1.0 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate hprose 0.1.0 on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", 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-8/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] def67a49215192c0b39fc5a93cbf167b773882ae4f67a90535bd7fbd9ac7597b
[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" "def67a49215192c0b39fc5a93cbf167b773882ae4f67a90535bd7fbd9ac7597b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "def67a49215192c0b39fc5a93cbf167b773882ae4f67a90535bd7fbd9ac7597b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "def67a49215192c0b39fc5a93cbf167b773882ae4f67a90535bd7fbd9ac7597b", kill_on_drop: false }`
[INFO] [stdout] def67a49215192c0b39fc5a93cbf167b773882ae4f67a90535bd7fbd9ac7597b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 76c2c184999993d63b4bf6fb666001a570c50643e954d0b020adb78d5721e521
[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" "76c2c184999993d63b4bf6fb666001a570c50643e954d0b020adb78d5721e521", kill_on_drop: false }`
[INFO] [stderr]     Checking traitobject v0.0.1
[INFO] [stderr]     Checking typeable v0.1.2
[INFO] [stderr]     Checking custom_derive v0.1.7
[INFO] [stderr]     Checking uuid v0.3.1
[INFO] [stderr]     Checking dtoa v0.2.2
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling unicase v1.4.2
[INFO] [stderr]     Checking hpack v0.2.0
[INFO] [stderr]     Checking mime v0.2.6
[INFO] [stderr]     Checking cookie v0.2.5
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]     Checking solicit v0.4.4
[INFO] [stderr]     Checking num-bigint v0.1.44
[INFO] [stderr]     Checking num-iter v0.1.41
[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-4d13b9954652019b.rmeta --extern dtoa=/opt/rustwide/target/debug/deps/libdtoa-d7ef839263513d30.rmeta --extern hyper=/opt/rustwide/target/debug/deps/libhyper-8aee4ef7ce98cbd8.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-c67ca3189b1bb84f.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-85efb7b923645623.rmeta --extern time=/opt/rustwide/target/debug/deps/libtime-06a439cbf99d31a6.rmeta --extern uuid=/opt/rustwide/target/debug/deps/libuuid-8e9ae9290aea59c0.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "76c2c184999993d63b4bf6fb666001a570c50643e954d0b020adb78d5721e521", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "76c2c184999993d63b4bf6fb666001a570c50643e954d0b020adb78d5721e521", kill_on_drop: false }`
[INFO] [stdout] 76c2c184999993d63b4bf6fb666001a570c50643e954d0b020adb78d5721e521