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Compiler Error CS1601

Method or delegate parameter cannot be of type 'type'

Some types in the base class library, for example, TypedReference and ArgIterator cannot be used as parameter types with the ref or out keywords.

The following sample generates CS1601:

// CS1601.cs
using System;

class MyClass
{
   public void Test1 (ref TypedReference t)   // CS1601
   {
   }

   public void Test2 (out ArgIterator t)   // CS1601
   {
   }
}
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