Tested using both PHP 7.3 and PHP 8:
1. I ran `arc liberate` and saw the standard output:
```lang=console
SCAN Searching for libraries in the current working directory...
WORK Updating library: src/
DONE Updated library.
```
2. I ran `arc liberate --verbose` and saw the verbose output:
```lang=console
SCAN Searching for libraries in the current working directory...
WORK Updating library: src/
Finding source files...
Found 5,987 files.
Loading symbol cache...
Found 5,987 files in cache.
Building library map...
Writing map..Done.
DONE Updated library.
```
2. I ran deleted `phabricator/src/.phutil_module_cache` and ran `arc liberate /src`, verifying that progress was displayed while the map was computed.