private void parseExecStatement() {
    assertCurrentToken(PyTokenTypes.EXEC_KEYWORD);
    final SyntaxTreeBuilder.Marker execStatement = myBuilder.mark();
    myBuilder.advanceLexer();
    getExpressionParser().parseExpression(true, false);
    if (myBuilder.getTokenType() == PyTokenTypes.IN_KEYWORD) {
      myBuilder.advanceLexer();
      getExpressionParser().parseSingleExpression(false);
      if (myBuilder.getTokenType() == PyTokenTypes.COMMA) {
        myBuilder.advanceLexer();
        getExpressionParser().parseSingleExpression(false);
      }
    }
    checkEndOfStatement();
    execStatement.done(PyElementTypes.EXEC_STATEMENT);
  }
private void parseExecStatement()