Example.cs

public void Method1((string, string) parameter)
{
	switch (parameter)
	{
		case var tObj when tObj.Item1 == "x":
			break;
	}
}

//Fails with:
//CS1061 'object' does not contain a definition for 'Item1' and no extension method 'Item1' accepting a first argument of type 'object' could be found
public void Method2(object parameter)
{
	switch (parameter)
	{
		case var tObj when tObj.Item1 == "x":
			break;
	}
}