Compiler Error CS1627

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Expression expected after yield return

This error occurs if yield is used without an expression. To avoid this error, insert the appropriate expression in the statement.

The following sample generates CS1627:

// CS1627.cs
using System.Collections;

class C : IEnumerable
{
   public IEnumerator GetEnumerator()
   {
      yield return;   // CS1627
      // To resolve, add the following line:
      // yield return 0;
   }
}

public class CMain
{
   public static void Main() { }
}