[INFO] fetching crate prongs 0.0.5...
[INFO] documenting prongs-0.0.5 against beta-2020-10-09 for beta-1.48-rustdoc-1
[INFO] extracting crate prongs 0.0.5 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate prongs 0.0.5 on toolchain beta-2020-10-09
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate prongs 0.0.5
[INFO] finished tweaking crates.io crate prongs 0.0.5
[INFO] tweaked toml for crates.io crate prongs 0.0.5 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded pistoncore-input v0.24.0
[INFO] [stderr]   Downloaded piston-viewport v0.5.0
[INFO] [stderr]   Downloaded pistoncore-event_loop v0.41.0
[INFO] [stderr]   Downloaded libudev-sys v0.1.4
[INFO] [stderr]   Downloaded piston-float v0.3.0
[INFO] [stderr]   Downloaded shader_version v0.3.0
[INFO] [stderr]   Downloaded piston v0.41.0
[INFO] [stderr]   Downloaded gilrs v0.6.3
[INFO] [stderr]   Downloaded pistoncore-window v0.36.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "+beta-2020-10-09" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] b635446dc0e00aa7233e2c7bed2db673b99fae44fc8a411ee78257a881f313c9
[INFO] running `Command { std: "docker" "start" "-a" "b635446dc0e00aa7233e2c7bed2db673b99fae44fc8a411ee78257a881f313c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b635446dc0e00aa7233e2c7bed2db673b99fae44fc8a411ee78257a881f313c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b635446dc0e00aa7233e2c7bed2db673b99fae44fc8a411ee78257a881f313c9", kill_on_drop: false }`
[INFO] [stdout] b635446dc0e00aa7233e2c7bed2db673b99fae44fc8a411ee78257a881f313c9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "+beta-2020-10-09" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d96e17eaf20cb4e5fda9cdc560fab7531b1d9fe2d0584c8b8d54049cd907babe
[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" "d96e17eaf20cb4e5fda9cdc560fab7531b1d9fe2d0584c8b8d54049cd907babe", kill_on_drop: false }`
[INFO] [stderr]  Documenting prongs v0.0.5 (/opt/rustwide/workdir)
[INFO] [stdout] error: No backend selected, use features=<backend> in Cargo.toml or --features <backend> when building directly.
[INFO] [stdout]   --> src/lib.rs:14:1
[INFO] [stdout]    |
[INFO] [stdout] 14 | compile_error!("No backend selected, use features=<backend> in Cargo.toml or --features <backend> when building directly.");
[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] [stderr] error: could not document `prongs`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name prongs 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 bitflags=/opt/rustwide/target/debug/deps/libbitflags-e1a9b9121eac1683.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-2566fd4b02fef410.rmeta --cap-lints=warn --crate-version 0.0.5` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "d96e17eaf20cb4e5fda9cdc560fab7531b1d9fe2d0584c8b8d54049cd907babe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d96e17eaf20cb4e5fda9cdc560fab7531b1d9fe2d0584c8b8d54049cd907babe", kill_on_drop: false }`
[INFO] [stdout] d96e17eaf20cb4e5fda9cdc560fab7531b1d9fe2d0584c8b8d54049cd907babe
