private boolean parseAllowedLiteralExpression() {
    if (atAnyOfTokens(PyTokenTypes.STRING_NODES)) {
      SyntaxTreeBuilder.Marker stringLiteral = myBuilder.mark();
      while (atAnyOfTokens(PyTokenTypes.STRING_NODES)) {
        nextToken();
      }
      stringLiteral.done(PyElementTypes.STRING_LITERAL_EXPRESSION);
      return true;
    }
    else if (atAnyOfTokens(PyTokenTypes.TRUE_KEYWORD, PyTokenTypes.FALSE_KEYWORD)) {
      buildTokenElement(PyElementTypes.BOOL_LITERAL_EXPRESSION, myBuilder);
      return true;
    }
    else if (atToken(PyTokenTypes.NONE_KEYWORD)) {
      buildTokenElement(PyElementTypes.NONE_LITERAL_EXPRESSION, myBuilder);
      return true;
    }
    else if (atAnyOfTokens(PyTokenTypes.PLUS, PyTokenTypes.MINUS) || atAnyOfTokens(PyTokenTypes.NUMERIC_LITERALS)) {
      parseComplexNumber();
      return true;
    }
    return false;
  }
private boolean parseAllowedLiteralExpression()