[INFO] fetching crate vk-shader-macros-impl 0.2.6...
[INFO] documenting vk-shader-macros-impl-0.2.6 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate vk-shader-macros-impl 0.2.6 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate vk-shader-macros-impl 0.2.6 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 vk-shader-macros-impl 0.2.6
[INFO] finished tweaking crates.io crate vk-shader-macros-impl 0.2.6
[INFO] tweaked toml for crates.io crate vk-shader-macros-impl 0.2.6 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] d3c86329929a15bf032d71ca435d5b4717aa04e0cc8d1a961e2841bbb2a45ee8
[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" "d3c86329929a15bf032d71ca435d5b4717aa04e0cc8d1a961e2841bbb2a45ee8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d3c86329929a15bf032d71ca435d5b4717aa04e0cc8d1a961e2841bbb2a45ee8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d3c86329929a15bf032d71ca435d5b4717aa04e0cc8d1a961e2841bbb2a45ee8", kill_on_drop: false }`
[INFO] [stdout] d3c86329929a15bf032d71ca435d5b4717aa04e0cc8d1a961e2841bbb2a45ee8
[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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 079f4c0393475204cb5c6bc20cb67260c08b16cf34c108ac17aa5782b7dc6cfd
[INFO] running `Command { std: "docker" "start" "-a" "079f4c0393475204cb5c6bc20cb67260c08b16cf34c108ac17aa5782b7dc6cfd", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]    Compiling shaderc-sys v0.6.2
[INFO] [stderr] error: could not compile `syn`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name syn --edition=2018 /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/syn-1.0.39/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata -Cembed-bitcode=no -C debuginfo=2 --cfg 'feature="derive"' --cfg 'feature="parsing"' --cfg 'feature="proc-macro"' --cfg 'feature="quote"' -C metadata=5510fea3f713eb03 -C extra-filename=-5510fea3f713eb03 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-17be1714580826fd.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-aa48b02cc1582459.rmeta --extern unicode_xid=/opt/rustwide/target/debug/deps/libunicode_xid-68f6f58da26e45d5.rmeta --cap-lints allow --cfg syn_disable_nightly_tests` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] The following warnings were emitted during compilation:
[INFO] [stderr] 
[INFO] [stderr] warning: Checking for system installed libraries.  Use --features = build-from-source to disable this behavior
[INFO] [stderr] warning: System installed library not found.  Falling back to build from source
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "079f4c0393475204cb5c6bc20cb67260c08b16cf34c108ac17aa5782b7dc6cfd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "079f4c0393475204cb5c6bc20cb67260c08b16cf34c108ac17aa5782b7dc6cfd", kill_on_drop: false }`
[INFO] [stdout] 079f4c0393475204cb5c6bc20cb67260c08b16cf34c108ac17aa5782b7dc6cfd