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The namespace alias qualifier '::' always resolves to a type or namespace so is illegal here. Consider using '.' instead.
This error occurs if you used something which the parser interpreted as a type in an unexpected place. A type or namespace name is valid only in a member access expression, using the member access (.) operator. This could occur if you used the global scope operator (::) in another context.
Example
The following sample generates CS0687:
// CS0687.cs
using M = Test;
using System;
public class Test
{
public static int x = 77;
public static void Main()
{
Console.WriteLine(M::x); // CS0687
// To resolve use the following line instead:
// Console.WriteLine(M.x);
}
}