[INFO] fetching crate ddsavelib 0.1.1...
[INFO] documenting ddsavelib-0.1.1 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate ddsavelib 0.1.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate ddsavelib 0.1.1 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 ddsavelib 0.1.1
[INFO] finished tweaking crates.io crate ddsavelib 0.1.1
[INFO] tweaked toml for crates.io crate ddsavelib 0.1.1 written to /workspace/builds/worker-4/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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] be7f9fa452f3eb880ef1d3be21c6632d43175a8fdcaf4e3596eafa9f8ed11fa7
[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" "be7f9fa452f3eb880ef1d3be21c6632d43175a8fdcaf4e3596eafa9f8ed11fa7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "be7f9fa452f3eb880ef1d3be21c6632d43175a8fdcaf4e3596eafa9f8ed11fa7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "be7f9fa452f3eb880ef1d3be21c6632d43175a8fdcaf4e3596eafa9f8ed11fa7", kill_on_drop: false }`
[INFO] [stdout] be7f9fa452f3eb880ef1d3be21c6632d43175a8fdcaf4e3596eafa9f8ed11fa7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 54d5c8fae2935fc75a65b2711eae74e7ce1c78ac29c9bb1b850f06e57e377170
[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" "54d5c8fae2935fc75a65b2711eae74e7ce1c78ac29c9bb1b850f06e57e377170", kill_on_drop: false }`
[INFO] [stderr]     Checking string_cache v0.8.0
[INFO] [stderr]  Documenting ddsavelib v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:53:1
[INFO] [stdout]    |
[INFO] [stdout] 53 | #![feature(try_reserve)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:54:1
[INFO] [stdout]    |
[INFO] [stdout] 54 | #![feature(or_patterns)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 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 `ddsavelib`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name ddsavelib src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --cfg 'feature="string_cache"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-cdbbc07100f440a1.rmeta --extern dtoa=/opt/rustwide/target/debug/deps/libdtoa-505c0f621c04b519.rmeta --extern itoa=/opt/rustwide/target/debug/deps/libitoa-a15cee56bcdb3d45.rmeta --extern once_cell=/opt/rustwide/target/debug/deps/libonce_cell-8810c110b9f3557a.rmeta --extern string_cache=/opt/rustwide/target/debug/deps/libstring_cache-13476211f81cf185.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "54d5c8fae2935fc75a65b2711eae74e7ce1c78ac29c9bb1b850f06e57e377170", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "54d5c8fae2935fc75a65b2711eae74e7ce1c78ac29c9bb1b850f06e57e377170", kill_on_drop: false }`
[INFO] [stdout] 54d5c8fae2935fc75a65b2711eae74e7ce1c78ac29c9bb1b850f06e57e377170