RUBY_Qundef       433 include/ruby/ruby.h #define Qundef ((VALUE)RUBY_Qundef)	/* undefined value for placeholder */
RUBY_Qundef       524 include/ruby/ruby.h 	((type) == RUBY_T_UNDEF) ? ((obj) == RUBY_Qundef) : \
RUBY_Qundef      1971 include/ruby/ruby.h 	if (obj == RUBY_Qundef) return RUBY_T_UNDEF;