these 2 derivations will be built:
  /nix/store/w31vnfvk4fjg6q0fskwc432mbzb9p64r-cargo-vendor-dir.drv
  /nix/store/bpisb6nigscka0npwzz4mhc2rsi866hq-fast-nix-gc-0.1.0.drv
these 4 paths will be fetched (221.9 KiB download, 919.8 KiB unpacked):
  /nix/store/9h20pqvcz8zgfi6plaa83yxjlwh4cbz2-chacha20-0.10.0
  /nix/store/9zqrhd1plrw3cdnn1bkyn4agpa0rakm4-log-0.4.33
  /nix/store/gif2a7abpdl4x51y4d0r0igrffmhazvv-rand-0.10.2
  /nix/store/lj0cg2hgh6wf5l89x1rfjfw674f8m0a0-rand_core-0.10.1
error: Cannot build '/nix/store/bpisb6nigscka0npwzz4mhc2rsi866hq-fast-nix-gc-0.1.0.drv'.
       Reason: builder failed with exit code 101.
       Output paths:
         /nix/store/7g7zvrj6zhx3ng445z79rnwlb67v9vm0-fast-nix-gc-0.1.0
       Last 25 log lines:
       > failures:
       >     gc_chunk_size_one_deletes_whole_dead_chain
       >     gc_cleans_unused_links_only_when_not_dry_run
       >     gc_deletes_drv_when_output_deriver_is_unset
       >     gc_deletes_unreferenced_paths
       >     gc_does_not_hang_on_tmp_fifo
       >     gc_drops_partial_temp_root
       >     gc_handles_self_references
       >     gc_ignores_invalid_store_basenames
       >     gc_keep_recent_pins_recently_registered
       >     gc_keeps_ca_deriver_via_deriver_field_not_build_trace
       >     gc_keeps_ca_outputs_of_alive_drv
       >     gc_keeps_deriver_of_alive_path
       >     gc_keeps_lock_file_of_active_build
       >     gc_keeps_runtime_roots_from_environ
       >     gc_max_freed_batches_by_estimated_size
       >     gc_max_freed_referrer_never_outlives_reference
       >     gc_max_freed_stops_early
       >     gc_rebases_canonical_runtime_roots_to_logical_store
       >     gc_removes_stale_temp_roots_file
       >     gc_runtime_roots_validated_against_db
       >
       > test result: FAILED. 25 passed; 20 failed; 0 ignored; 0 measured; 0 filtered out; finished in 10.73s
       >
       > error: test failed, to rerun pass `-p fast-nix-gc --test integration`
       For full logs, run:
         nix log /nix/store/bpisb6nigscka0npwzz4mhc2rsi866hq-fast-nix-gc-0.1.0.drv