ASSIGN_EXPRESSION  170 create.c           exp = crb_alloc_expression(ASSIGN_EXPRESSION);
ASSIGN_EXPRESSION  291 eval.c             case ASSIGN_EXPRESSION:
ASSIGN_EXPRESSION  378 eval.c             case ASSIGN_EXPRESSION:
ASSIGN_EXPRESSION 1370 eval.c             case ASSIGN_EXPRESSION:
ASSIGN_EXPRESSION  140 util.c             case ASSIGN_EXPRESSION:	/* FALLTHRU */