[INFO] crate proptest 0.9.4 is already in cache
[INFO] extracting crate proptest 0.9.4 into work/ex/beta-1.38-1/sources/1.37.0/reg/proptest/0.9.4
[INFO] extracting crate proptest 0.9.4 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/proptest/0.9.4
[INFO] validating manifest of proptest-0.9.4 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 proptest-0.9.4 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 proptest-0.9.4
[INFO] finished frobbing proptest-0.9.4
[INFO] frobbed toml for proptest-0.9.4 written to work/ex/beta-1.38-1/sources/1.37.0/reg/proptest/0.9.4/Cargo.toml
[INFO] started frobbing proptest-0.9.4
[INFO] finished frobbing proptest-0.9.4
[INFO] frobbed toml for proptest-0.9.4 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/proptest/0.9.4/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 proptest-0.9.4 against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/proptest/0.9.4:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] c20f94ce69bfb4773f095f8788215e683ab3335673af0ac9aaa2363f23672b01
[INFO] running `"docker" "start" "-a" "c20f94ce69bfb4773f095f8788215e683ab3335673af0ac9aaa2363f23672b01"`
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling proptest v0.9.4 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 20.83s
[INFO] running `"docker" "inspect" "c20f94ce69bfb4773f095f8788215e683ab3335673af0ac9aaa2363f23672b01"`
[INFO] running `"docker" "rm" "-f" "c20f94ce69bfb4773f095f8788215e683ab3335673af0ac9aaa2363f23672b01"`
[INFO] [stdout] c20f94ce69bfb4773f095f8788215e683ab3335673af0ac9aaa2363f23672b01
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/proptest/0.9.4:/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] d10c5006ad38c098fc5e01221af0d902af782be386ea01444bdd98e895106b49
[INFO] running `"docker" "start" "-a" "d10c5006ad38c098fc5e01221af0d902af782be386ea01444bdd98e895106b49"`
[INFO] [stderr]    Compiling proptest v0.9.4 (/opt/crater/workdir)
[INFO] [stderr] error: Could not compile `proptest`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --edition=2018 --crate-name proptest src/lib.rs --color never --emit=dep-info,link -C debuginfo=2 --test --cfg 'feature="bit-set"' --cfg 'feature="break-dead-code"' --cfg 'feature="default"' --cfg 'feature="fork"' --cfg 'feature="lazy_static"' --cfg 'feature="quick-error"' --cfg 'feature="regex-syntax"' --cfg 'feature="rusty-fork"' --cfg 'feature="std"' --cfg 'feature="tempfile"' --cfg 'feature="timeout"' -C metadata=e9a64073f669d655 -C extra-filename=-e9a64073f669d655 --out-dir /opt/crater/target/debug/deps -L dependency=/opt/crater/target/debug/deps --extern bit_set=/opt/crater/target/debug/deps/libbit_set-7ac8ae4e843c6512.rlib --extern bitflags=/opt/crater/target/debug/deps/libbitflags-bcd34e8f74846360.rlib --extern byteorder=/opt/crater/target/debug/deps/libbyteorder-c825b3b5c7c90892.rlib --extern lazy_static=/opt/crater/target/debug/deps/liblazy_static-eb33edc716f69401.rlib --extern num_traits=/opt/crater/target/debug/deps/libnum_traits-1886320fa1feb02d.rlib --extern quick_error=/opt/crater/target/debug/deps/libquick_error-a2165722eb49e44c.rlib --extern rand=/opt/crater/target/debug/deps/librand-e3f4bfe7b33bf416.rlib --extern rand_chacha=/opt/crater/target/debug/deps/librand_chacha-e30594121fba25f8.rlib --extern rand_xorshift=/opt/crater/target/debug/deps/librand_xorshift-4203f3157eb9a8e3.rlib --extern regex=/opt/crater/target/debug/deps/libregex-3f288169bf5fc935.rlib --extern regex_syntax=/opt/crater/target/debug/deps/libregex_syntax-74b9e606898eafee.rlib --extern rusty_fork=/opt/crater/target/debug/deps/librusty_fork-d17aafb29163b037.rlib --extern tempfile=/opt/crater/target/debug/deps/libtempfile-a788379f87d4adba.rlib --cap-lints=warn` (signal: 9, SIGKILL: kill)
[INFO] running `"docker" "inspect" "d10c5006ad38c098fc5e01221af0d902af782be386ea01444bdd98e895106b49"`
[INFO] running `"docker" "rm" "-f" "d10c5006ad38c098fc5e01221af0d902af782be386ea01444bdd98e895106b49"`
[INFO] [stdout] d10c5006ad38c098fc5e01221af0d902af782be386ea01444bdd98e895106b49