private void arguments(Tree t) { // Arguments: '(' [ Expression { ',' Expression } ] ')'
		if (t.node.length() == 0) {
			return; // No arguments.
		}
		t = t.branches.get(1);
		if (t.node.length() > 0) { // Expression { ',' Expression }
			expression(t.branches.get(0));
			for (Tree u: t.branches.get(1).branches) {
				expression(u.branches.get(1));
			}
		}
	}