for i, arg := range args {
		switch a := arg.(type) {
		case nil:
			arg = "<nil>"
		case operand:
			panic("got operand instead of *operand")
		case *operand:
			arg = operandString(a, qf)
		case syntax.Pos:
			arg = a.String()
		case syntax.Expr:
			arg = ExprString(a)
		case []syntax.Expr:
			var buf strings.Builder
			buf.WriteByte('[')
			for i, x := range a {
				if i > 0 {

	for i, arg := range args {
		switch a := arg.(type) {
		case nil:
			arg = "<nil>"
		case operand:
			panic("got operand instead of *operand")
		case *operand:
			arg = operandString(a, qf)
		case token.Pos:
			if fset != nil {
				arg = fset.Position(a).String()
			}
		case ast.Expr:
			arg = ExprString(a)
		case []ast.Expr:
			var buf bytes.Buffer
			buf.WriteByte('[')