Compiler Error CS0541

'declaration' : explicit interface declaration can only be declared in a class or struct

An explicit interface declaration was found outside a class or struct.

The following sample generates CS0541:

// CS0541.cs  
namespace x  
{  
   interface IFace  
   {  
      void F();  
   }  
  
   interface IFace2 : IFace  
   {  
      void IFace.F();   // CS0541  
   }  
}