ExpressionType IParsingExpressionVisitor <ExpressionType> .VisitPattern(ParsingExpression.Pattern pattern)
 {
     return(new ExprPatternType()
     {
         Pattern = pattern.ExprString
     });
 }
 object IParsingExpressionVisitor <object> .VisitPattern(ParsingExpression.Pattern pattern)
 {
     this.RegisterField("@string");
     return(null);
 }