this derivation will be built:
  /nix/store/frksa47ghpapgj9p1dwzwy1pdpyjq8wj-harmonia-llvm-cov-3.3.0.drv
error: Cannot build '/nix/store/frksa47ghpapgj9p1dwzwy1pdpyjq8wj-harmonia-llvm-cov-3.3.0.drv'.
       Reason: builder failed with exit code 100.
       Output paths:
         /nix/store/kxs6m9h00jmr79jvmgqrpcalv8kay9vy-harmonia-llvm-cov-3.3.0
       Last 25 log lines:
       >     failures:
       >         derived_path::test_derived_path_built::to_json
       >
       >     test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 73 filtered out; finished in 0.01s
       >
       >   stderr ───
       >
       >     thread 'derived_path::test_derived_path_built::to_json' (82916084) panicked at harmonia-utils-test/src/json_upstream.rs:40:29:
       >     Failed to read /nix/store/59lnk44qvngcvf6gd75vddn3sjc71nxk-source/src/libstore-tests/data/derived-path/mutli_built.json: No such file or directory (os error 2)
       >     note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
       >
       >         PASS [   0.158s] (2008/2511) harmonia-store-derivation::json_upstream derivation_output::test_derivation_output_impure::from_json
       >         PASS [   0.077s] (2009/2511) harmonia-store-derivation::json_upstream derived_path::test_derived_path_built_built::to_json
       >         PASS [   0.074s] (2010/2511) harmonia-store-derivation::json_upstream derived_path::test_derived_path_built_built_wildcard::from_json
       >         PASS [   0.131s] (2011/2511) harmonia-store-derivation::json_upstream derived_path::test_derived_path_built_built::from_json
       >         PASS [   0.101s] (2012/2511) harmonia-store-derivation::json_upstream derived_path::test_derived_path_built_built_wildcard::to_json
       >         PASS [  35.619s] (2013/2511) harmonia-cache::retry test_download_retry_over_flaky_connection
       >         PASS [   7.676s] (2014/2511) harmonia-store-aterm input_address::tests::hash_derivation_varies
       >         PASS [  35.677s] (2015/2511) harmonia-protocol wire_roundtrip::roundtrip_query_missing_result
       > ────────────
       >      Summary [  63.232s] 2015/2511 tests run: 2013 passed, 2 failed, 0 skipped
       >         FAIL [   0.121s] (2006/2511) harmonia-store-derivation::json_upstream derived_path::test_derived_path_built::from_json
       >         FAIL [   0.057s] (2007/2511) harmonia-store-derivation::json_upstream derived_path::test_derived_path_built::to_json
       > warning: 496/2511 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/frksa47ghpapgj9p1dwzwy1pdpyjq8wj-harmonia-llvm-cov-3.3.0.drv