(script
  (function_declaration
    name: (identifier)
    (parameters)
    return_type: (type_specifier)
    body: (compound_statement
      (using_statement
        (expression_statement
          (binary_expression
            left: (variable)
            right: (call_expression
              function: (scoped_identifier
                (qualified_identifier
                  (identifier))
                (identifier))
              (arguments))))))))