DEFINED_CVAR     3448 compile.c      	ADD_INSN3(ret, nd_line(node), defined, INT2FIX(DEFINED_CVAR),
DEFINED_CVAR     2561 vm_insnhelper.c       case DEFINED_CVAR: {
DEFINED_CVAR     2565 vm_insnhelper.c 	    expr_type = DEFINED_CVAR;