Dec 18 12:48:22.348 INFO checking proptest-0.8.7 against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 12:48:22.349 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-0/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/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" "+0b8c5828f68d7b2840b81fa51239346dc97fef5a-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 12:48:22.762 INFO [stdout] 1e250b065248983f63f59c87ed0f1fb2f6b5447d73c3df16cf745ed1c5795c81
Dec 18 12:48:22.764 INFO running `"docker" "start" "-a" "1e250b065248983f63f59c87ed0f1fb2f6b5447d73c3df16cf745ed1c5795c81"`
Dec 18 12:48:24.792 INFO [stderr]     Checking wait-timeout v0.1.5
Dec 18 12:48:24.792 INFO [stderr]     Checking rand v0.5.5
Dec 18 12:48:25.336 INFO [stderr]     Checking rusty-fork v0.2.1
Dec 18 12:48:27.516 INFO [stderr]     Checking proptest v0.8.7 (/opt/crater/workdir)
Dec 18 12:48:39.164 INFO [stderr] warning: unused `core::result::Result` that must be used
Dec 18 12:48:39.164 INFO [stderr]    --> src/test_runner/failure_persistence/file.rs:308:5
Dec 18 12:48:39.164 INFO [stderr]     |
Dec 18 12:48:39.164 INFO [stderr] 308 |     write!(buf, "{}", format_basic_seed_line(seed));
Dec 18 12:48:39.164 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 12:48:39.164 INFO [stderr]     |
Dec 18 12:48:39.164 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 18 12:48:39.164 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 12:48:39.164 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)
Dec 18 12:48:39.164 INFO [stderr] 
Dec 18 12:48:49.156 INFO [stderr] warning: unused `core::result::Result` that must be used
Dec 18 12:48:49.156 INFO [stderr]    --> src/test_runner/failure_persistence/file.rs:308:5
Dec 18 12:48:49.156 INFO [stderr]     |
Dec 18 12:48:49.156 INFO [stderr] 308 |     write!(buf, "{}", format_basic_seed_line(seed));
Dec 18 12:48:49.156 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 12:48:49.156 INFO [stderr]     |
Dec 18 12:48:49.156 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 18 12:48:49.156 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 12:48:49.156 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)
Dec 18 12:48:49.156 INFO [stderr] 
Dec 18 12:48:49.580 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 24.91s
Dec 18 12:48:50.256 INFO running `"docker" "inspect" "1e250b065248983f63f59c87ed0f1fb2f6b5447d73c3df16cf745ed1c5795c81"`
Dec 18 12:48:50.421 INFO running `"docker" "rm" "-f" "1e250b065248983f63f59c87ed0f1fb2f6b5447d73c3df16cf745ed1c5795c81"`
Dec 18 12:48:50.571 INFO [stdout] 1e250b065248983f63f59c87ed0f1fb2f6b5447d73c3df16cf745ed1c5795c81