Dec 05 08:50:40.632 INFO checking proptest-0.8.7 against try#1df97983eb2057dc6a8f7eb364e263b51ae23230 for pr-56481
Dec 05 08:50:40.632 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56481/worker-2/try#1df97983eb2057dc6a8f7eb364e263b51ae23230:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-2/pr-56481/try#1df97983eb2057dc6a8f7eb364e263b51ae23230:/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 +1df97983eb2057dc6a8f7eb364e263b51ae23230-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 08:50:41.080 INFO [stdout] 215b27b413bb4c1a755400d3eea1f49b49588c27466e897ec72f91b9f0a82b01
Dec 05 08:50:41.087 INFO running `"docker" "start" "-a" "215b27b413bb4c1a755400d3eea1f49b49588c27466e897ec72f91b9f0a82b01"`
Dec 05 08:50:42.502 INFO [stderr] usermod: no changes
Dec 05 08:50:42.651 INFO [stderr]     Checking proptest v0.8.7 (/source)
Dec 05 08:50:56.647 INFO [stderr] warning: unused `core::result::Result` that must be used
Dec 05 08:50:56.647 INFO [stderr]    --> src/test_runner/failure_persistence/file.rs:308:5
Dec 05 08:50:56.647 INFO [stderr]     |
Dec 05 08:50:56.648 INFO [stderr] 308 |     write!(buf, "{}", format_basic_seed_line(seed));
Dec 05 08:50:56.648 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 08:50:56.648 INFO [stderr]     |
Dec 05 08:50:56.649 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 05 08:50:56.649 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 08:50:56.649 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 08:50:56.649 INFO [stderr] 
Dec 05 08:51:13.588 INFO [stderr] warning: unused `core::result::Result` that must be used
Dec 05 08:51:13.588 INFO [stderr]    --> src/test_runner/failure_persistence/file.rs:308:5
Dec 05 08:51:13.588 INFO [stderr]     |
Dec 05 08:51:13.588 INFO [stderr] 308 |     write!(buf, "{}", format_basic_seed_line(seed));
Dec 05 08:51:13.588 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 08:51:13.588 INFO [stderr]     |
Dec 05 08:51:13.588 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 05 08:51:13.589 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 08:51:13.589 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 08:51:13.589 INFO [stderr] 
Dec 05 08:51:14.033 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 31.51s
Dec 05 08:51:14.044 INFO [stderr] su: No module specific data is present
Dec 05 08:51:14.697 INFO running `"docker" "inspect" "215b27b413bb4c1a755400d3eea1f49b49588c27466e897ec72f91b9f0a82b01"`
Dec 05 08:51:15.023 INFO running `"docker" "rm" "-f" "215b27b413bb4c1a755400d3eea1f49b49588c27466e897ec72f91b9f0a82b01"`
Dec 05 08:51:15.331 INFO [stdout] 215b27b413bb4c1a755400d3eea1f49b49588c27466e897ec72f91b9f0a82b01