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Compiler Error CS0590 

Error Message

User-defined operators cannot return void

The purpose of a user-defined operator is to return an object.

The following sample generates CS0590:

// CS0590.cs
namespace x
   public class a
      public static void operator+(a A1, a A2)   // CS0590

      // try the following user-defined operator
      public static a operator+(a A1, a A2)
         return A2;

      public static int Main()
         return 1;

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