rb_str_setter     621 include/ruby/intern.h void rb_str_setter(VALUE, ID, VALUE*);
rb_str_setter    8543 io.c               rb_define_hooked_variable("$,", &rb_output_fs, 0, rb_str_setter);
rb_str_setter    8549 io.c               rb_define_hooked_variable("$/", &rb_rs, 0, rb_str_setter);
rb_str_setter    8550 io.c               rb_define_hooked_variable("$-0", &rb_rs, 0, rb_str_setter);
rb_str_setter    8551 io.c               rb_define_hooked_variable("$\\", &rb_output_rs, 0, rb_str_setter);