verbose_setter   1754 ruby.c             rb_define_hooked_variable("$VERBOSE", &ruby_verbose, 0, verbose_setter);
verbose_setter   1755 ruby.c             rb_define_hooked_variable("$-v", &ruby_verbose, 0, verbose_setter);
verbose_setter   1756 ruby.c             rb_define_hooked_variable("$-w", &ruby_verbose, 0, verbose_setter);