[INFO] fetching crate dam 0.1.3...
[INFO] documenting dam-0.1.3 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate dam 0.1.3 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate dam 0.1.3 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 dam 0.1.3
[INFO] finished tweaking crates.io crate dam 0.1.3
[INFO] tweaked toml for crates.io crate dam 0.1.3 written to /workspace/builds/worker-1/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] [stderr]     Blocking waiting for file lock on package cache
[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" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 87fdd6a78f6dbccc00614f5d04c4899ce82b9937cabb4b92dcda4ca68b8177c3
[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" "87fdd6a78f6dbccc00614f5d04c4899ce82b9937cabb4b92dcda4ca68b8177c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "87fdd6a78f6dbccc00614f5d04c4899ce82b9937cabb4b92dcda4ca68b8177c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "87fdd6a78f6dbccc00614f5d04c4899ce82b9937cabb4b92dcda4ca68b8177c3", kill_on_drop: false }`
[INFO] [stdout] 87fdd6a78f6dbccc00614f5d04c4899ce82b9937cabb4b92dcda4ca68b8177c3
[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" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7866f4a3b58498bc09213d397d31aad535a151472eb4ce0c26fad9bc4d521266
[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" "7866f4a3b58498bc09213d397d31aad535a151472eb4ce0c26fad9bc4d521266", kill_on_drop: false }`
[INFO] [stderr]     Checking checksum v0.2.1
[INFO] [stderr]     Checking open v1.4.0
[INFO] [stderr]     Checking rexif v0.3.7
[INFO] [stderr]    Compiling libsqlite3-sys v0.11.1
[INFO] [stderr]     Checking rusqlite v0.16.0
[INFO] [stderr]  Documenting dam v0.1.3 (/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(try_trait, uniform_paths)]
[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 `dam`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name dam 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 checksum=/opt/rustwide/target/debug/deps/libchecksum-f98445f9e96f19a9.rmeta --extern chrono=/opt/rustwide/target/debug/deps/libchrono-8ddd5e37f7f73bd8.rmeta --extern clap=/opt/rustwide/target/debug/deps/libclap-5e80f06216331e5d.rmeta --extern open=/opt/rustwide/target/debug/deps/libopen-b6a76bfdc3a7dd16.rmeta --extern rexif=/opt/rustwide/target/debug/deps/librexif-696e9ef4e5e0b6e1.rmeta --extern rusqlite=/opt/rustwide/target/debug/deps/librusqlite-cbf008e5f5246e54.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-de526c2f95fb2c08.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-3cc4975c0cfd1501.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "7866f4a3b58498bc09213d397d31aad535a151472eb4ce0c26fad9bc4d521266", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7866f4a3b58498bc09213d397d31aad535a151472eb4ce0c26fad9bc4d521266", kill_on_drop: false }`
[INFO] [stdout] 7866f4a3b58498bc09213d397d31aad535a151472eb4ce0c26fad9bc4d521266