CSharpCodeBlock - [0..20)::20 - [@using static System]
    RazorDirective - [0..20)::20
        CSharpTransition - [0..1)::1 - Gen<None> - SpanEditHandler;Accepts:None
            Transition;[@];
        RazorDirectiveBody - [1..20)::19
            CSharpStatementLiteral - [1..20)::19 - [using static System] - Gen<Import: static System;> - SpanEditHandler;Accepts:AnyExceptNewline
                Keyword;[using];
                Whitespace;[ ];
                Keyword;[static];
                Whitespace;[ ];
                Identifier;[System];
