this derivation will be built:
  /nix/store/491gxr6hbjcx5z96bdx2sym019xxp7ba-iets-test-0.1.0.drv
error: Cannot build '/nix/store/491gxr6hbjcx5z96bdx2sym019xxp7ba-iets-test-0.1.0.drv'.
       Reason: builder failed with exit code 101.
       Output paths:
         /nix/store/wjx62s253q6jnyzb47vwk8hcv0mz1v19-iets-test-0.1.0
       Last 25 log lines:
       > test concurrent_readers_and_writers_never_see_a_torn_entry ... FAILED
       >
       > running 1 test
       >
       > running 1 test
       > test a_killed_writer_leaves_the_store_usable ... ok
       >
       > failures:
       >
       > ---- concurrent_readers_and_writers_never_see_a_torn_entry stdout ----
       >
       > thread '<unnamed>' (6068) panicked at tests/cache_hygiene.rs:82:24:
       > a published entry parses
       > note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
       >
       > thread 'concurrent_readers_and_writers_never_see_a_torn_entry' (6058) panicked at tests/cache_hygiene.rs:121:5:
       > a scoped thread panicked
       >
       >
       > failures:
       >     concurrent_readers_and_writers_never_see_a_torn_entry
       >
       > test result: FAILED. 9 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.31s
       >
       > error: test failed, to rerun pass `--test cache_hygiene`
       For full logs, run:
         nix log /nix/store/491gxr6hbjcx5z96bdx2sym019xxp7ba-iets-test-0.1.0.drv