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Create a new C# library project and add this class:
using Color = Tuple<float,float,float,float>;
public static class Foo
You will get a compile error on the second line:
error CS0246: The type or namespace name `Tuple' could not be found. Are you missing `System' using directive?
Clearly, we are not missing the using directive.
Changing the second line to the fully qualified name, System.Tuple<float,float,float,float>, causes the error to go away.
Fixed in master