[INFO] crate hocon 0.3.0 is already in cache
[INFO] extracting crate hocon 0.3.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/hocon/0.3.0
[INFO] extracting crate hocon 0.3.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/hocon/0.3.0
[INFO] validating manifest of hocon-0.3.0 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of hocon-0.3.0 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing hocon-0.3.0
[INFO] finished frobbing hocon-0.3.0
[INFO] frobbed toml for hocon-0.3.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/hocon/0.3.0/Cargo.toml
[INFO] started frobbing hocon-0.3.0
[INFO] finished frobbing hocon-0.3.0
[INFO] frobbed toml for hocon-0.3.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/hocon/0.3.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing hocon-0.3.0 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/hocon/0.3.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] a76432ab4e197bd729384eba30c333a824f46c192ada0721125080640089489a
[INFO] running `"docker" "start" "-a" "a76432ab4e197bd729384eba30c333a824f46c192ada0721125080640089489a"`
[INFO] [stderr]    Compiling java-properties v1.2.0
[INFO] [stderr]    Compiling publicsuffix v1.5.2
[INFO] [stderr]    Compiling cookie_store v0.7.0
[INFO] [stderr]    Compiling reqwest v0.9.20
[INFO] [stderr]    Compiling hocon v0.3.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variant is never constructed: `Root`
[INFO] [stderr]   --> src/serde/de.rs:84:5
[INFO] [stderr]    |
[INFO] [stderr] 84 |     Root,
[INFO] [stderr]    |     ^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 23.28s
[INFO] running `"docker" "inspect" "a76432ab4e197bd729384eba30c333a824f46c192ada0721125080640089489a"`
[INFO] running `"docker" "rm" "-f" "a76432ab4e197bd729384eba30c333a824f46c192ada0721125080640089489a"`
[INFO] [stdout] a76432ab4e197bd729384eba30c333a824f46c192ada0721125080640089489a
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/hocon/0.3.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] d027cdc11a5ea5d0d0622f62e750237ba8f14c8679293646f2532f58508fe826
[INFO] running `"docker" "start" "-a" "d027cdc11a5ea5d0d0622f62e750237ba8f14c8679293646f2532f58508fe826"`
[INFO] [stderr]    Compiling ci_info v0.3.1
[INFO] [stderr]    Compiling test-generator v0.2.2
[INFO] [stderr]    Compiling ron v0.4.2
[INFO] [stderr]    Compiling tinytemplate v1.0.2
[INFO] [stderr]    Compiling criterion v0.2.11
[INFO] [stderr]    Compiling insta v0.7.4
[INFO] [stderr]    Compiling hocon v0.3.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variant is never constructed: `Root`
[INFO] [stderr]   --> src/serde/de.rs:84:5
[INFO] [stderr]    |
[INFO] [stderr] 84 |     Root,
[INFO] [stderr]    |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `hocon`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --edition=2018 --crate-name hocon src/lib.rs --color never --emit=dep-info,link -C debuginfo=2 --test --cfg 'feature="default"' --cfg 'feature="reqwest"' --cfg 'feature="serde"' --cfg 'feature="serde-support"' --cfg 'feature="test-snapshot"' --cfg 'feature="url-support"' -C metadata=a55c3d85f5dfe16b -C extra-filename=-a55c3d85f5dfe16b --out-dir /opt/crater/target/debug/deps -L dependency=/opt/crater/target/debug/deps --extern criterion=/opt/crater/target/debug/deps/libcriterion-88ba2ba8eb01eb72.rlib --extern failure=/opt/crater/target/debug/deps/libfailure-0e2ba5b5fecbe196.rlib --extern insta=/opt/crater/target/debug/deps/libinsta-5b83e236e2014a2c.rlib --extern java_properties=/opt/crater/target/debug/deps/libjava_properties-cfaa4dade91e04f8.rlib --extern memchr=/opt/crater/target/debug/deps/libmemchr-8599562422b87512.rlib --extern nom=/opt/crater/target/debug/deps/libnom-c4ba714323d7ab09.rlib --extern reqwest=/opt/crater/target/debug/deps/libreqwest-c80aa5471542ed59.rlib --extern serde=/opt/crater/target/debug/deps/libserde-50e5d46514dccf4f.rlib --extern serde_json=/opt/crater/target/debug/deps/libserde_json-5e1c62a001e50ba1.rlib --extern test_generator=/opt/crater/target/debug/deps/libtest_generator-b11b34ec53c746b7.so --cap-lints=warn -L native=/opt/crater/target/debug/build/backtrace-sys-d5ae900bfde9750d/out` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "d027cdc11a5ea5d0d0622f62e750237ba8f14c8679293646f2532f58508fe826"`
[INFO] running `"docker" "rm" "-f" "d027cdc11a5ea5d0d0622f62e750237ba8f14c8679293646f2532f58508fe826"`
[INFO] [stdout] d027cdc11a5ea5d0d0622f62e750237ba8f14c8679293646f2532f58508fe826