public Expression deepCopy(gnu.kawa.util.IdentityHashTable mapper) {
Expression f = deepCopy(func, mapper);
Expression[] a = deepCopy(args, mapper);
if ((f == null && func != null) || (a == null && args != null)) return null;
ApplyExp copy = new ApplyExp(f, a);
copy.flags = getFlags();
return copy;
}
