RUBY_Qnil         432 include/ruby/ruby.h #define Qnil   ((VALUE)RUBY_Qnil)
RUBY_Qnil         523 include/ruby/ruby.h 	((type) == RUBY_T_NIL) ? ((obj) == RUBY_Qnil) : \
RUBY_Qnil        1957 include/ruby/ruby.h 	if (obj == RUBY_Qnil)   return rb_cNilClass;
RUBY_Qnil        1974 include/ruby/ruby.h 	if (obj == RUBY_Qnil)   return RUBY_T_NIL;