Boo.Lang.Parser.BooParserBase.unpack_stmt C# (CSharp) Method

        protected UnpackStatement unpack_stmt()
        {
            UnpackStatement s;

                s = null;
                StatementModifier m = null;

            try {      // for error handling
            s=unpack();
            {
                switch ( LA(1) )
                {
                case IF:
                case UNLESS:
                case WHILE:
                {
                    m=stmt_modifier();
                    break;
                }
                case EOL:
                case EOS:
                {
                    break;
                }
                default:
                {
                    throw new NoViableAltException(LT(1), getFilename());
                }
                 }
            }
            eos();
            if (0==inputState.guessing)
            {

                        s.Modifier = m;

            }
            }
            catch (RecognitionException ex)
            {
            if (0 == inputState.guessing)
            {
                reportError(ex, "unpack_stmt");
                recover(ex,tokenSet_82_);
            }
            else
            {
                throw ex;
            }
            }
            return s;
        }