WARNING: Can't open library ''.
WARNING: Can't open library 'non/existent/path/non-file'.
WARNING: Can't open library 'test/'.
WARNING: Can't open library '/'.
WARNING: Ignoring unknown module 'test3' in file use-tests.scad, line 42
WARNING: Ignoring unknown module 'test4' in file use-tests.scad, line 43
WARNING: Ignoring unknown variable 'test2_variable' in file use-tests.scad, line 49
