private void parseAssertStatement() {
    assertCurrentToken(PyTokenTypes.ASSERT_KEYWORD);
    final SyntaxTreeBuilder.Marker assertStatement = myBuilder.mark();
    myBuilder.advanceLexer();
    if (getExpressionParser().parseSingleExpression(false)) {
      if (myBuilder.getTokenType() == PyTokenTypes.COMMA) {
        myBuilder.advanceLexer();
        if (!getExpressionParser().parseSingleExpression(false)) {
          myContext.getBuilder().error(PyParsingBundle.message("PARSE.expected.expression"));
        }
      }
      checkEndOfStatement();
    }
    else {
      myContext.getBuilder().error(PyParsingBundle.message("PARSE.expected.expression"));
    }
    assertStatement.done(PyElementTypes.ASSERT_STATEMENT);
  }
private void parseAssertStatement()