[INFO] cloning repository https://github.com/metaworm/easy-rpc
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/metaworm/easy-rpc" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmetaworm%2Feasy-rpc", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmetaworm%2Feasy-rpc'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] abdea55a0b278b68339a60ae6aba9b4d5f1d249b
[INFO] documenting metaworm/easy-rpc against 1.46.0 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmetaworm%2Feasy-rpc" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/metaworm/easy-rpc 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 git repo https://github.com/metaworm/easy-rpc
[INFO] finished tweaking git repo https://github.com/metaworm/easy-rpc
[INFO] tweaked toml for git repo https://github.com/metaworm/easy-rpc written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/metaworm/easy-rpc already has a lockfile, it will not be regenerated
[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-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 04453f569a7353c926519a3a4e55f234ae3e2d6d3ebf8db166059811204aa2b6
[INFO] running `Command { std: "docker" "start" "-a" "04453f569a7353c926519a3a4e55f234ae3e2d6d3ebf8db166059811204aa2b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "04453f569a7353c926519a3a4e55f234ae3e2d6d3ebf8db166059811204aa2b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "04453f569a7353c926519a3a4e55f234ae3e2d6d3ebf8db166059811204aa2b6", kill_on_drop: false }`
[INFO] [stdout] 04453f569a7353c926519a3a4e55f234ae3e2d6d3ebf8db166059811204aa2b6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] 08d61e316fe5092c90e46fede32b0a8dda265976351e3d4315d316437280bf42
[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" "08d61e316fe5092c90e46fede32b0a8dda265976351e3d4315d316437280bf42", kill_on_drop: false }`
[INFO] [stderr]     Checking smallvec v1.0.0
[INFO] [stderr]    Compiling serde v1.0.103
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling nix v0.10.0
[INFO] [stderr]     Checking downcast-rs v1.1.1
[INFO] [stderr]    Compiling num-traits v0.2.10
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]     Checking lock_api v0.3.3
[INFO] [stderr]     Checking tokio-sync v0.1.7
[INFO] [stderr]     Checking memrange v0.1.3
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking base64 v0.9.3
[INFO] [stderr]     Checking smallvec v0.6.13
[INFO] [stderr]    Compiling parking_lot_core v0.6.2
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking mime v0.2.6
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking tokio-executor v0.1.9
[INFO] [stderr]     Checking unicode-normalization v0.1.11
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking theban_interval_tree v0.7.1
[INFO] [stderr]     Checking tokio-io v0.1.12
[INFO] [stderr]     Checking rmp v0.8.8
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking enum_primitive v0.1.1
[INFO] [stderr]     Checking idna v0.1.5
[INFO] [stderr]     Checking rmpv v0.4.2
[INFO] [stderr]     Checking tokio-reactor v0.1.11
[INFO] [stderr]     Checking tokio-codec v0.1.1
[INFO] [stderr]     Checking tokio-tcp v0.1.3
[INFO] [stderr]     Checking url v1.7.2
[INFO] [stderr]     Checking websocket-base v0.24.0
[INFO] [stderr]     Checking hyper v0.10.16
[INFO] [stderr]    Compiling shared_memory_derive v0.10.0
[INFO] [stderr]     Checking websocket v0.24.0
[INFO] [stderr]     Checking shared_memory v0.10.0
[INFO] [stderr]     Checking serde_bytes v0.11.3
[INFO] [stderr]     Checking rmp-serde v0.14.2
[INFO] [stderr]  Documenting easy-rpc 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:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(unboxed_closures, fn_traits)]
[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 `easy-rpc`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name easy_rpc src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --cfg 'feature="shared_memory"' --cfg 'feature="shm"' --cfg 'feature="websocket"' --cfg 'feature="ws"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern downcast_rs=/opt/rustwide/target/debug/deps/libdowncast_rs-49fdcf619df356e9.rmeta --extern rmp=/opt/rustwide/target/debug/deps/librmp-f041570b9fb609aa.rmeta --extern rmp_serde=/opt/rustwide/target/debug/deps/librmp_serde-d00148a4e6a812d1.rmeta --extern rmpv=/opt/rustwide/target/debug/deps/librmpv-b75890861bbdfa23.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-4e5f3e360e0c732b.rmeta --extern serde_bytes=/opt/rustwide/target/debug/deps/libserde_bytes-f8bffec68b1dfe3f.rmeta --extern shared_memory=/opt/rustwide/target/debug/deps/libshared_memory-f00be5e401a97252.rmeta --extern websocket=/opt/rustwide/target/debug/deps/libwebsocket-9c326d984940d130.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "08d61e316fe5092c90e46fede32b0a8dda265976351e3d4315d316437280bf42", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "08d61e316fe5092c90e46fede32b0a8dda265976351e3d4315d316437280bf42", kill_on_drop: false }`
[INFO] [stdout] 08d61e316fe5092c90e46fede32b0a8dda265976351e3d4315d316437280bf42