rb_file_directory_p 1901 dir.c              rb_define_singleton_method(rb_cDir,"exist?", rb_file_directory_p, 1); /* in file.c */
rb_file_directory_p 1902 dir.c              rb_define_singleton_method(rb_cDir,"exists?", rb_file_directory_p, 1); /* in file.c */
rb_file_directory_p 3608 file.c         	    return rb_file_directory_p(0, argv[1]);
rb_file_directory_p 4665 file.c             define_filetest_function("directory?", rb_file_directory_p, 1);
rb_file_directory_p  350 include/ruby/intern.h VALUE rb_file_directory_p(VALUE,VALUE);