rb_check_symbol     8 ext/-test-/symbol/init.c     return rb_check_symbol(&sym);
rb_check_symbol  1448 ext/tk/tkutil/tkutil.c             arg_sym = rb_check_symbol(&str);
rb_check_symbol  3297 ext/win32ole/win32ole.c     sym = rb_check_symbol(&mid);
rb_check_symbol  1726 include/ruby/ruby.h VALUE rb_check_symbol(volatile VALUE *namep);
rb_check_symbol   832 struct.c       	idx = rb_check_symbol(name);