public Expression Visit(ParserPair pair)
{
Expression left = pair.Left.Accept(this);
Expression right = pair.Right.Accept(this);
// this might cause problems later
return(new PairExpression <Expression, Expression>(left, right));
}
public ParserType Visit(ParserPair pair)
{
var leftType = pair.Left.Accept(this);
var rightType = pair.Right.Accept(this);
ParserType prodType = new ParserProdType(leftType, rightType);
pair.Type = prodType;
return(prodType);
}