rb_io_readlines  8335 io.c           	    lines = rb_io_readlines(argc, argv, ARGF.current_file);
rb_io_readlines  9751 io.c               return rb_io_readlines(arg->argc, arg->argv, arg->io);
rb_io_readlines  12311 io.c               rb_define_method(rb_cIO, "readlines",  rb_io_readlines, -1);