}
private SEXP parse(String source) {
try {
ParseState state = new ParseState();
ParseOptions options = ParseOptions.defaults();
RLexer lexer = new RLexer(options, state, new StringReader(source));
RParser parser = new RParser(options, state, lexer);
assertThat("parser.parse succeeds", parser.parse(), equalTo(true));
RParser.StatusResult status = parser.getResultStatus();