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Compiler Error CS1681

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You cannot redefine the global extern alias

The global alias is already defined to include all unaliased references and therefore cannot be redefined.

Example

The following sample generates CS1681.

// CS1681.cs
// compile with: /reference:global=System.dll
// CS1681 expected

// try this instead: /reference:System.dll
class A
{
   static void Main() {}
}