CLOSURE_EXPRESSION  361 create.c           exp = crb_alloc_expression(CLOSURE_EXPRESSION);
CLOSURE_EXPRESSION  376 eval.c             case CLOSURE_EXPRESSION:	/* FALLTHRU */
CLOSURE_EXPRESSION  456 eval.c             case CLOSURE_EXPRESSION:	/* FALLTHRU */
CLOSURE_EXPRESSION 1699 eval.c             case CLOSURE_EXPRESSION: