[INFO] fetching crate intercom-utils 0.2.0...
[INFO] documenting intercom-utils-0.2.0 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate intercom-utils 0.2.0 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate intercom-utils 0.2.0 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 intercom-utils 0.2.0
[INFO] finished tweaking crates.io crate intercom-utils 0.2.0
[INFO] tweaked toml for crates.io crate intercom-utils 0.2.0 written to /workspace/builds/worker-10/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]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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] f715640d93d0ca68b1fb0bcaa4090b6fbf77744441a2861f7d9430bfa1837a0c
[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" "f715640d93d0ca68b1fb0bcaa4090b6fbf77744441a2861f7d9430bfa1837a0c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f715640d93d0ca68b1fb0bcaa4090b6fbf77744441a2861f7d9430bfa1837a0c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f715640d93d0ca68b1fb0bcaa4090b6fbf77744441a2861f7d9430bfa1837a0c", kill_on_drop: false }`
[INFO] [stdout] f715640d93d0ca68b1fb0bcaa4090b6fbf77744441a2861f7d9430bfa1837a0c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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] 9697edf4949d20271e12b92d72d94f8b4ea36bfe729925eeb01fbd5c1300906f
[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" "9697edf4949d20271e12b92d72d94f8b4ea36bfe729925eeb01fbd5c1300906f", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking unicode-xid v0.0.4
[INFO] [stderr]     Checking sha1 v0.3.0
[INFO] [stderr]     Checking if_chain v0.1.3
[INFO] [stderr]     Checking synom v0.11.3
[INFO] [stderr]     Checking syn v0.11.11
[INFO] [stderr]     Checking intercom-common v0.2.0
[INFO] [stderr]  Documenting intercom-utils v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(try_trait)]
[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 `intercom-utils`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name intercom_utils src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern clap=/opt/rustwide/target/debug/deps/libclap-15ce467a31897e75.rmeta --extern glob=/opt/rustwide/target/debug/deps/libglob-97c4f128e25cf4a7.rmeta --extern if_chain=/opt/rustwide/target/debug/deps/libif_chain-317e10168dd40308.rmeta --extern intercom_common=/opt/rustwide/target/debug/deps/libintercom_common-b2138a964dae8316.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-c16ada43942a5256.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-cfd7d42b77a0a6c4.rmeta --cap-lints=warn --crate-version 0.2.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "9697edf4949d20271e12b92d72d94f8b4ea36bfe729925eeb01fbd5c1300906f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9697edf4949d20271e12b92d72d94f8b4ea36bfe729925eeb01fbd5c1300906f", kill_on_drop: false }`
[INFO] [stdout] 9697edf4949d20271e12b92d72d94f8b4ea36bfe729925eeb01fbd5c1300906f
