[INFO] fetching crate javascript_lexer 0.1.8...
[INFO] documenting javascript_lexer-0.1.8 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate javascript_lexer 0.1.8 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate javascript_lexer 0.1.8 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate javascript_lexer 0.1.8
[INFO] finished tweaking crates.io crate javascript_lexer 0.1.8
[INFO] tweaked toml for crates.io crate javascript_lexer 0.1.8 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded phf_macros v0.7.24
[INFO] [stderr]   Downloaded internship v0.6.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fae5fc1d9a4dc1d5f16d0a793afa9a57443a78e9ba4f3cc25baf4ca389f4a4ff
[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" "fae5fc1d9a4dc1d5f16d0a793afa9a57443a78e9ba4f3cc25baf4ca389f4a4ff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fae5fc1d9a4dc1d5f16d0a793afa9a57443a78e9ba4f3cc25baf4ca389f4a4ff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fae5fc1d9a4dc1d5f16d0a793afa9a57443a78e9ba4f3cc25baf4ca389f4a4ff", kill_on_drop: false }`
[INFO] [stdout] fae5fc1d9a4dc1d5f16d0a793afa9a57443a78e9ba4f3cc25baf4ca389f4a4ff
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+1.47.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 59afe55186cfda92e7970760876b5cfe516e34ba35f99855d8882942780e3acb
[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" "59afe55186cfda92e7970760876b5cfe516e34ba35f99855d8882942780e3acb", kill_on_drop: false }`
[INFO] [stderr]     Checking siphasher v0.2.3
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]     Checking internship v0.6.0
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking phf_shared v0.7.24
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]    Compiling phf_macros v0.7.24
[INFO] [stderr]     Checking phf v0.7.24
[INFO] [stderr]  Documenting javascript_lexer v0.1.8 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(const_fn, box_syntax, pattern, proc_macro_hygiene)]
[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 `javascript_lexer`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name javascript_lexer 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 internship=/opt/rustwide/target/debug/deps/libinternship-c4a153856891a2e0.rmeta --extern phf=/opt/rustwide/target/debug/deps/libphf-eeb74d6556c56b8b.rmeta --cap-lints=warn --crate-version 0.1.8` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "59afe55186cfda92e7970760876b5cfe516e34ba35f99855d8882942780e3acb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "59afe55186cfda92e7970760876b5cfe516e34ba35f99855d8882942780e3acb", kill_on_drop: false }`
[INFO] [stdout] 59afe55186cfda92e7970760876b5cfe516e34ba35f99855d8882942780e3acb
