[INFO] crate proptest 0.8.7 is already in cache
[INFO] extracting crate proptest 0.8.7 into work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/reg/proptest/0.8.7
[INFO] extracting crate proptest 0.8.7 into work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/reg/proptest/0.8.7
[INFO] validating manifest of proptest-0.8.7 on toolchain master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of proptest-0.8.7 on toolchain try#7fea0229842e79db1159ea58ad9a653b288efee9
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+7fea0229842e79db1159ea58ad9a653b288efee9-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing proptest-0.8.7
[INFO] finished frobbing proptest-0.8.7
[INFO] frobbed toml for proptest-0.8.7 written to work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/reg/proptest/0.8.7/Cargo.toml
[INFO] started frobbing proptest-0.8.7
[INFO] finished frobbing proptest-0.8.7
[INFO] frobbed toml for proptest-0.8.7 written to work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/reg/proptest/0.8.7/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+7fea0229842e79db1159ea58ad9a653b288efee9-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+7fea0229842e79db1159ea58ad9a653b288efee9-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] building proptest-0.8.7 against master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54 for pr-57967
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57967/worker-0/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/reg/proptest/0.8.7:/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=forbid" "-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" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "build" "--frozen"`
[INFO] [stdout] 431ea3d1047432776b965d8ad6a199bdc8dfe8d2625d7bb091bb8b2acfb6fd60
[INFO] running `"docker" "start" "-a" "431ea3d1047432776b965d8ad6a199bdc8dfe8d2625d7bb091bb8b2acfb6fd60"`
[INFO] [stderr]    Compiling proptest v0.8.7 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `core::result::Result` that must be used
[INFO] [stderr]    --> src/test_runner/failure_persistence/file.rs:308:5
[INFO] [stderr]     |
[INFO] [stderr] 308 |     write!(buf, "{}", format_basic_seed_line(seed));
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 17.47s
[INFO] running `"docker" "inspect" "431ea3d1047432776b965d8ad6a199bdc8dfe8d2625d7bb091bb8b2acfb6fd60"`
[INFO] running `"docker" "rm" "-f" "431ea3d1047432776b965d8ad6a199bdc8dfe8d2625d7bb091bb8b2acfb6fd60"`
[INFO] [stdout] 431ea3d1047432776b965d8ad6a199bdc8dfe8d2625d7bb091bb8b2acfb6fd60
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57967/worker-0/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/reg/proptest/0.8.7:/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=forbid" "-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" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "test" "--frozen" "--no-run"`
[INFO] [stdout] b9c98ca630c356e0af4336be91d8323a6a4cb9c3e818d7e57dd0286fd9775934
[INFO] running `"docker" "start" "-a" "b9c98ca630c356e0af4336be91d8323a6a4cb9c3e818d7e57dd0286fd9775934"`
[INFO] [stderr]    Compiling proptest v0.8.7 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `core::result::Result` that must be used
[INFO] [stderr]    --> src/test_runner/failure_persistence/file.rs:308:5
[INFO] [stderr]     |
[INFO] [stderr] 308 |     write!(buf, "{}", format_basic_seed_line(seed));
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `proptest`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name proptest src/lib.rs --color never --emit=dep-info,link -C debuginfo=2 --test --cfg 'feature="bit-set"' --cfg 'feature="byteorder"' --cfg 'feature="default"' --cfg 'feature="fork"' --cfg 'feature="num-traits"' --cfg 'feature="quick-error"' --cfg 'feature="rand"' --cfg 'feature="regex-syntax"' --cfg 'feature="rusty-fork"' --cfg 'feature="std"' --cfg 'feature="tempfile"' --cfg 'feature="timeout"' -C metadata=e1bc2c211ec3f088 -C extra-filename=-e1bc2c211ec3f088 --out-dir /opt/crater/target/debug/deps -L dependency=/opt/crater/target/debug/deps --extern bit_set=/opt/crater/target/debug/deps/libbit_set-a92870e8f1d26642.rlib --extern bitflags=/opt/crater/target/debug/deps/libbitflags-ed58a05e59fdcb43.rlib --extern byteorder=/opt/crater/target/debug/deps/libbyteorder-09bc31756541fc38.rlib --extern lazy_static=/opt/crater/target/debug/deps/liblazy_static-a0cbf4fdea3ca3e4.rlib --extern num_traits=/opt/crater/target/debug/deps/libnum_traits-f121310661e6bdf5.rlib --extern quick_error=/opt/crater/target/debug/deps/libquick_error-ea0d6e434161175a.rlib --extern rand=/opt/crater/target/debug/deps/librand-767f2b6cadbc4d9e.rlib --extern regex=/opt/crater/target/debug/deps/libregex-ba01e1d78f3c6658.rlib --extern regex_syntax=/opt/crater/target/debug/deps/libregex_syntax-8fb1c37efb68e4f4.rlib --extern rusty_fork=/opt/crater/target/debug/deps/librusty_fork-c6ecf8cda330f6c8.rlib --extern tempfile=/opt/crater/target/debug/deps/libtempfile-f0b49dc94310e650.rlib --cap-lints=forbid` (signal: 9, SIGKILL: kill)
[INFO] running `"docker" "inspect" "b9c98ca630c356e0af4336be91d8323a6a4cb9c3e818d7e57dd0286fd9775934"`
[INFO] running `"docker" "rm" "-f" "b9c98ca630c356e0af4336be91d8323a6a4cb9c3e818d7e57dd0286fd9775934"`
[INFO] [stdout] b9c98ca630c356e0af4336be91d8323a6a4cb9c3e818d7e57dd0286fd9775934