rb_file_directory_p 2633 dir.c              return rb_file_directory_p(obj, fname);
rb_file_directory_p 2752 dir.c              rb_define_singleton_method(rb_cDir,"exist?", rb_file_directory_p, 1);
rb_file_directory_p 4736 file.c         	    return rb_file_directory_p(0, argv[1]);
rb_file_directory_p 5904 file.c             define_filetest_function("directory?", rb_file_directory_p, 1);
rb_file_directory_p  480 include/ruby/intern.h VALUE rb_file_directory_p(VALUE,VALUE);