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Compiler Error CS1027

#endif directive expected

A matching #endif preprocessor directive was not found for a specified #if directive. Or, the compiler may have found a #endregion directive when there was no matching #region directive inside a #if block.

The following sample generates CS1027:

// CS1027.cs
#if true   // CS1027, uncomment next line to resolve
// #endif

namespace x
   public class clx
      public static void Main()
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