AST __t226 = _t;
AST __t228 = _t;
	public final void param(AST _t,		List vars	) throws RecognitionException, XPathException {				AST param_AST_in = (AST)_t;		AST varname = null;				AST __t224 = _t;		varname = _t==ASTNULL ? null :(AST)_t;		match(_t,VARIABLE_BINDING);		_t = _t.getFirstChild();							FunctionParameter var = new FunctionParameter(varname.getText());					vars.add(var);						{		if (_t==null) _t=ASTNULL;		switch ( _t.getType()) {		case LITERAL_as:		{			AST __t226 = _t;			AST tmp38_AST_in = (AST)_t;			match(_t,LITERAL_as);			_t = _t.getFirstChild();											SequenceType type = new SequenceType();										sequenceType(_t,type);			_t = _retTree;			_t = __t226;			_t = _t.getNextSibling();										var.type = type;									break;		}		case 3:		{			break;		}		default:		{			throw new NoViableAltException(_t);		}		}		}		_t = __t224;		_t = _t.getNextSibling();		_retTree = _t;	}