Dec 18 12:48:23.081 INFO checking proptest-0.8.7 against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 12:48:23.081 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-2/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/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" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 12:48:23.569 INFO [stdout] cbeba9a80abeaf8c39e2dd9c83cc4d1ebb5ab4375597414b1d134e624a3d513b
Dec 18 12:48:23.571 INFO running `"docker" "start" "-a" "cbeba9a80abeaf8c39e2dd9c83cc4d1ebb5ab4375597414b1d134e624a3d513b"`
Dec 18 12:48:25.880 INFO [stderr]     Checking proptest v0.8.7 (/opt/crater/workdir)
Dec 18 12:48:37.971 INFO [stderr] warning: unused `core::result::Result` that must be used
Dec 18 12:48:37.971 INFO [stderr]    --> src/test_runner/failure_persistence/file.rs:308:5
Dec 18 12:48:37.971 INFO [stderr]     |
Dec 18 12:48:37.972 INFO [stderr] 308 |     write!(buf, "{}", format_basic_seed_line(seed));
Dec 18 12:48:37.972 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 12:48:37.972 INFO [stderr]     |
Dec 18 12:48:37.972 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 18 12:48:37.972 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 12:48:37.972 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 12:48:37.972 INFO [stderr] 
Dec 18 12:48:47.224 INFO [stderr] warning: unused `core::result::Result` that must be used
Dec 18 12:48:47.224 INFO [stderr]    --> src/test_runner/failure_persistence/file.rs:308:5
Dec 18 12:48:47.224 INFO [stderr]     |
Dec 18 12:48:47.224 INFO [stderr] 308 |     write!(buf, "{}", format_basic_seed_line(seed));
Dec 18 12:48:47.224 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 12:48:47.224 INFO [stderr]     |
Dec 18 12:48:47.224 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 18 12:48:47.224 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 12:48:47.224 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 12:48:47.224 INFO [stderr] 
Dec 18 12:48:47.604 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 21.89s
Dec 18 12:48:48.327 INFO running `"docker" "inspect" "cbeba9a80abeaf8c39e2dd9c83cc4d1ebb5ab4375597414b1d134e624a3d513b"`
Dec 18 12:48:48.604 INFO running `"docker" "rm" "-f" "cbeba9a80abeaf8c39e2dd9c83cc4d1ebb5ab4375597414b1d134e624a3d513b"`
Dec 18 12:48:48.848 INFO [stdout] cbeba9a80abeaf8c39e2dd9c83cc4d1ebb5ab4375597414b1d134e624a3d513b