private ReturnNode Return() throws SyntaxException {
        try {
            Position pos = iterator.current().coordinates().starting();
            nextToken();

            if (iterator.current().type().is(Token.Type.FirstOfExpression)) {
                return new ReturnNode(Expression(), pos);
            } else {            
                return new ReturnNode(pos);
            }
        } catch(SyntaxException ex) {
            throw ex;
        } catch(Exception ex) {
            throw (NonAnalysisException)new NonAnalysisException(ex)
                    .initPosition(iterator.current().coordinates().starting())
                    .Log("ru.bmstu.iu9.compiler.syntax");
        }
    }