Dec 05 08:50:41.704 INFO checking proptest-0.8.7 against master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc for pr-56481
Dec 05 08:50:41.704 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56481/worker-1/master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/pr-56481/master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +c8ae2de8363be088604ffa2ccba84ff7ad7250bc-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 05 08:50:42.159 INFO [stdout] 8394c965f959271b09e023c75e89295f19a99d7bf7ea79e2213c5a361dac7bc5
Dec 05 08:50:42.161 INFO running `"docker" "start" "-a" "8394c965f959271b09e023c75e89295f19a99d7bf7ea79e2213c5a361dac7bc5"`
Dec 05 08:50:43.867 INFO [stderr] usermod: no changes
Dec 05 08:50:44.009 INFO [stderr]     Checking proptest v0.8.7 (/source)
Dec 05 08:51:01.091 INFO [stderr] warning: unused `core::result::Result` that must be used
Dec 05 08:51:01.092 INFO [stderr]    --> src/test_runner/failure_persistence/file.rs:308:5
Dec 05 08:51:01.092 INFO [stderr]     |
Dec 05 08:51:01.092 INFO [stderr] 308 |     write!(buf, "{}", format_basic_seed_line(seed));
Dec 05 08:51:01.092 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 08:51:01.092 INFO [stderr]     |
Dec 05 08:51:01.092 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 05 08:51:01.093 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 08:51:01.093 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 05 08:51:01.093 INFO [stderr] 
Dec 05 08:51:14.287 INFO [stderr] warning: unused `core::result::Result` that must be used
Dec 05 08:51:14.288 INFO [stderr]    --> src/test_runner/failure_persistence/file.rs:308:5
Dec 05 08:51:14.288 INFO [stderr]     |
Dec 05 08:51:14.288 INFO [stderr] 308 |     write!(buf, "{}", format_basic_seed_line(seed));
Dec 05 08:51:14.288 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 08:51:14.288 INFO [stderr]     |
Dec 05 08:51:14.288 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 05 08:51:14.288 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 08:51:14.288 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 05 08:51:14.288 INFO [stderr] 
Dec 05 08:51:14.735 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 30.83s
Dec 05 08:51:14.746 INFO [stderr] su: No module specific data is present
Dec 05 08:51:15.719 INFO running `"docker" "inspect" "8394c965f959271b09e023c75e89295f19a99d7bf7ea79e2213c5a361dac7bc5"`
Dec 05 08:51:15.989 INFO running `"docker" "rm" "-f" "8394c965f959271b09e023c75e89295f19a99d7bf7ea79e2213c5a361dac7bc5"`
Dec 05 08:51:16.203 INFO [stdout] 8394c965f959271b09e023c75e89295f19a99d7bf7ea79e2213c5a361dac7bc5