[INFO] fetching crate wither 0.9.0-alpha.1...
[INFO] documenting wither-0.9.0-alpha.1 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate wither 0.9.0-alpha.1 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate wither 0.9.0-alpha.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 wither 0.9.0-alpha.1
[INFO] finished tweaking crates.io crate wither 0.9.0-alpha.1
[INFO] tweaked toml for crates.io crate wither 0.9.0-alpha.1 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate crates.io crate wither 0.9.0-alpha.1 already has a lockfile, it will not be regenerated
[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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded wither_derive v0.9.0-alpha.1
[INFO] [stderr]   Downloaded mongodb v1.0.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] b3435cc17075da94af6bc6bbbbc1a5b5051dbfb5555f980b76ea4614e1a0d37b
[INFO] running `Command { std: "docker" "start" "-a" "b3435cc17075da94af6bc6bbbbc1a5b5051dbfb5555f980b76ea4614e1a0d37b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b3435cc17075da94af6bc6bbbbc1a5b5051dbfb5555f980b76ea4614e1a0d37b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b3435cc17075da94af6bc6bbbbc1a5b5051dbfb5555f980b76ea4614e1a0d37b", kill_on_drop: false }`
[INFO] [stdout] b3435cc17075da94af6bc6bbbbc1a5b5051dbfb5555f980b76ea4614e1a0d37b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] 3cd40100b9e8ace51a10762eb3984da2cad186cbcb9a99d90719a73ba72706f3
[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" "3cd40100b9e8ace51a10762eb3984da2cad186cbcb9a99d90719a73ba72706f3", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro-nested v0.1.5
[INFO] [stderr]    Compiling rustversion v1.0.2
[INFO] [stderr]    Compiling serde_json v1.0.55
[INFO] [stderr]     Checking version_check v0.9.2
[INFO] [stderr]    Compiling ring v0.16.14
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.2
[INFO] [stderr]    Compiling proc-macro-error v1.0.2
[INFO] [stderr]     Checking hostname v0.3.1
[INFO] [stderr]     Checking os_info v2.0.6
[INFO] [stderr]     Checking futures-intrusive v0.3.1
[INFO] [stderr]    Compiling Inflector v0.11.4
[INFO] [stderr]     Checking pbkdf2 v0.3.0
[INFO] [stderr]    Compiling serde_derive v1.0.111
[INFO] [stderr]    Compiling pin-project-internal v0.4.20
[INFO] [stderr]    Compiling syn-mid v0.5.0
[INFO] [stderr]    Compiling async-trait v0.1.35
[INFO] [stderr]    Compiling thiserror-impl v1.0.19
[INFO] [stderr]    Compiling enum-as-inner v0.3.2
[INFO] [stderr]    Compiling darling_core v0.10.2
[INFO] [stderr]    Compiling serde_with_macros v1.1.0
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]    Compiling typed-builder v0.3.0
[INFO] [stderr]    Compiling derivative v2.1.1
[INFO] [stderr]     Checking tokio v0.2.21
[INFO] [stderr]     Checking resolv-conf v0.6.3
[INFO] [stderr] error: could not compile `darling_core`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name darling_core /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/darling_core-0.10.2/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 --cfg 'feature="strsim"' --cfg 'feature="suggestions"' -C metadata=f37294fb13e4f8ba -C extra-filename=-f37294fb13e4f8ba --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern fnv=/opt/rustwide/target/debug/deps/libfnv-88a5a807ed216706.rmeta --extern ident_case=/opt/rustwide/target/debug/deps/libident_case-634d7ab32771e49f.rmeta --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-09ae4a5d872360b6.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-ccdc0d5249338b89.rmeta --extern strsim=/opt/rustwide/target/debug/deps/libstrsim-fce151227d345c46.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-0c524531e3e84a0c.rmeta --cap-lints allow` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "3cd40100b9e8ace51a10762eb3984da2cad186cbcb9a99d90719a73ba72706f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3cd40100b9e8ace51a10762eb3984da2cad186cbcb9a99d90719a73ba72706f3", kill_on_drop: false }`
[INFO] [stdout] 3cd40100b9e8ace51a10762eb3984da2cad186cbcb9a99d90719a73ba72706f3