verbose_setter   2140 ruby.c             rb_define_hooked_variable("$VERBOSE", &ruby_verbose, 0, verbose_setter);
verbose_setter   2141 ruby.c             rb_define_hooked_variable("$-v", &ruby_verbose, 0, verbose_setter);
verbose_setter   2142 ruby.c             rb_define_hooked_variable("$-w", &ruby_verbose, 0, verbose_setter);