[INFO] fetching crate kf-protocol-fs 2.0.1...
[INFO] documenting kf-protocol-fs-2.0.1 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate kf-protocol-fs 2.0.1 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate kf-protocol-fs 2.0.1 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 kf-protocol-fs 2.0.1
[INFO] finished tweaking crates.io crate kf-protocol-fs 2.0.1
[INFO] tweaked toml for crates.io crate kf-protocol-fs 2.0.1 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate crates.io crate kf-protocol-fs 2.0.1 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-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] d62dc15c6c6c9f56a6745245e7915074ee83fcc7b94edf6a4f7b94afe4c0369d
[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" "d62dc15c6c6c9f56a6745245e7915074ee83fcc7b94edf6a4f7b94afe4c0369d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d62dc15c6c6c9f56a6745245e7915074ee83fcc7b94edf6a4f7b94afe4c0369d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d62dc15c6c6c9f56a6745245e7915074ee83fcc7b94edf6a4f7b94afe4c0369d", kill_on_drop: false }`
[INFO] [stdout] d62dc15c6c6c9f56a6745245e7915074ee83fcc7b94edf6a4f7b94afe4c0369d
[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] cdb58201025865e4f7cc7a07194627b1da9c19da240641892bf269d27125c3b1
[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" "cdb58201025865e4f7cc7a07194627b1da9c19da240641892bf269d27125c3b1", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.31
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling libc v0.2.71
[INFO] [stderr]    Compiling wasm-bindgen-shared v0.2.63
[INFO] [stderr]    Compiling wasm-bindgen v0.2.63
[INFO] [stderr]    Compiling crc32c v0.4.0
[INFO] [stderr]     Checking send_wrapper v0.4.0
[INFO] [stderr]     Checking scoped-tls-hkt v0.1.2
[INFO] [stderr]    Compiling paste-impl v0.1.17
[INFO] [stderr]     Checking tokio v0.2.21
[INFO] [stderr]     Checking content_inspector v0.2.4
[INFO] [stderr]     Checking num-integer v0.1.43
[INFO] [stderr]    Compiling num-derive v0.2.5
[INFO] [stderr]     Checking kv-log-macro v1.0.6
[INFO] [stderr]    Compiling kf-protocol-derive v0.1.0
[INFO] [stderr]     Checking paste v0.1.17
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking time v0.1.43
[INFO] [stderr]     Checking socket2 v0.3.12
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking nix v0.17.0
[INFO] [stderr]     Checking memmap v0.7.0
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking env_logger v0.6.2
[INFO] [stderr]     Checking chrono v0.4.11
[INFO] [stderr]     Checking flv-util v0.1.1
[INFO] [stderr]     Checking flv-util v0.2.0
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.63
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.63
[INFO] [stderr]    Compiling pin-project-internal v0.4.22
[INFO] [stderr]    Compiling futures-macro v0.3.5
[INFO] [stderr]    Compiling serde_derive v1.0.112
[INFO] [stderr]    Compiling async-trait v0.1.35
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.63
[INFO] [stderr]     Checking pin-project v0.4.22
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking js-sys v0.3.40
[INFO] [stderr]     Checking serde v1.0.112
[INFO] [stderr]     Checking web-sys v0.3.40
[INFO] [stderr]     Checking piper v0.1.3
[INFO] [stderr]     Checking futures-executor v0.3.5
[INFO] [stderr]     Checking futures v0.3.5
[INFO] [stderr]     Checking smol v0.1.12
[INFO] [stderr]     Checking gloo-timers v0.2.1
[INFO] [stderr]     Checking futures-timer v3.0.2
[INFO] [stderr]     Checking async-std v1.6.1
[INFO] [stderr]     Checking kf-protocol-core v0.1.2
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/kf-protocol-core-0.1.2/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(specialization)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `kf-protocol-core`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "cdb58201025865e4f7cc7a07194627b1da9c19da240641892bf269d27125c3b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cdb58201025865e4f7cc7a07194627b1da9c19da240641892bf269d27125c3b1", kill_on_drop: false }`
[INFO] [stdout] cdb58201025865e4f7cc7a07194627b1da9c19da240641892bf269d27125c3b1