this derivation will be built:
  /nix/store/23fkj128wpvi4q4yshnkb4rfwcl9v8mr-harmonia-llvm-cov-3.1.0.drv
error: Cannot build '/nix/store/23fkj128wpvi4q4yshnkb4rfwcl9v8mr-harmonia-llvm-cov-3.1.0.drv'.
       Reason: builder failed with exit code 100.
       Output paths:
         /nix/store/s0lgcnlwf9wsdjkirr349x91bqalz0x6-harmonia-llvm-cov-3.1.0
       Last 25 log lines:
       >         PASS [   0.613s] ( 912/2250) harmonia-cache::tls test_tls
       >         PASS [   0.618s] ( 913/2250) harmonia-cache::security_paths malformed_hash_is_4xx_not_5xx
       >         PASS [   0.632s] ( 914/2250) harmonia-cache::error_responses serve_missing_file_does_not_leak_fs_path
       >         PASS [   0.677s] ( 915/2250) harmonia-cache::security_xss serve_directory_listing_escapes_filenames_in_href
       >         PASS [   0.754s] ( 916/2250) harmonia-cache::log test_build_log_endpoint
       >         PASS [   0.804s] ( 917/2250) harmonia-cache::signing test_signing
       >         PASS [   0.829s] ( 918/2250) harmonia-cache::chroot test_chroot
       >         PASS [   2.327s] ( 919/2250) harmonia-file-nar archive::restorer::proptests::proptest_restore_dump
       >         PASS [   2.379s] ( 920/2250) harmonia-protocol ser::mock::proptests::proptest_mock
       >         PASS [  30.521s] ( 921/2250) harmonia-cache::retry test_download_retry_over_flaky_connection
       > ────────────
       >      Summary [  30.523s] 921/2250 tests run: 910 passed, 11 exec failed, 0 skipped
       >        XFAIL [   0.000s] ( 538/2250) harmonia-protocol ser::writer::unittests::test_write_slice::case_02_one::chunks_size_10_1024::buf_size_08_8
       >        XFAIL [   0.000s] ( 541/2250) harmonia-protocol ser::writer::unittests::test_write_slice::case_02_one::chunks_size_08_8::buf_size_06_6
       >        XFAIL [   0.000s] ( 542/2250) harmonia-protocol ser::writer::unittests::test_write_slice::case_02_one::chunks_size_08_8::buf_size_07_7
       >        XFAIL [   0.000s] ( 543/2250) harmonia-protocol ser::writer::unittests::test_write_slice::case_03_two::chunks_size_01_1::buf_size_10_1024
       >        XFAIL [   0.000s] ( 550/2250) harmonia-protocol ser::writer::unittests::test_write_slice::case_03_two::chunks_size_02_2::buf_size_05_5
       >        XFAIL [   0.000s] ( 551/2250) harmonia-protocol ser::writer::unittests::test_write_slice::case_03_two::chunks_size_02_2::buf_size_07_7
       >        XFAIL [   0.000s] ( 552/2250) harmonia-protocol ser::writer::unittests::test_write_slice::case_03_two::chunks_size_02_2::buf_size_09_9
       >        XFAIL [   0.000s] ( 553/2250) harmonia-protocol ser::writer::unittests::test_write_slice::case_03_two::chunks_size_02_2::buf_size_08_8
       >        XFAIL [   0.000s] ( 554/2250) harmonia-protocol ser::writer::unittests::test_write_slice::case_03_two::chunks_size_02_2::buf_size_10_1024
       >        XFAIL [   0.000s] ( 555/2250) harmonia-protocol ser::writer::unittests::test_write_slice::case_03_two::chunks_size_03_3::buf_size_01_1
       >        XFAIL [   0.000s] ( 557/2250) harmonia-protocol ser::writer::unittests::test_write_slice::case_03_two::chunks_size_03_3::buf_size_03_3
       > warning: 1329/2250 tests were not run due to test failure (run with --no-fail-fast to run all tests, or run with --max-fail)
       > error: test run failed
       For full logs, run:
         nix log /nix/store/23fkj128wpvi4q4yshnkb4rfwcl9v8mr-harmonia-llvm-cov-3.1.0.drv