/** Returns a flat list of variables held by this LambdaList. */
public Object vars() {
if (this.vars != null) return this.vars;
Object ret = Symbols.NIL;
// whole
if (this.whole != null) ret = Lists.nconc(this.whole.vars(), ret);
// required
for (int i = 0; i < this.required.length; i++) ret = Lists.nconc(this.required[i].vars(), ret);
// optional
for (int i = 0; i < this.optional.length; i++) ret = Lists.nconc(this.optional[i].vars(), ret);
// rest
if (this.rest != null) ret = Lists.nconc(this.rest.vars(), ret);
// keyword
for (int i = 0; i < this.keyword.length; i++) ret = Lists.nconc(this.keyword[i].vars(), ret);
// aux
for (int i = 0; i < this.aux.length; i++) ret = Lists.nconc(this.aux[i].vars(), ret);
this.vars = ret;
return ret;
}
