Directive block - Gen<None> - 11 - (0:0,0)
    Code span - Gen<Import: Foo;> - [using FooLF] - SpanEditHandler;Accepts:AnyExceptNewline - (0:0,0) - Tokens:4
        CSharpTokenType.Keyword;[using];
        CSharpTokenType.WhiteSpace;[ ];
        CSharpTokenType.Identifier;[Foo];
        CSharpTokenType.NewLine;[LF];
