CSharpCodeBlock - [0..3)::3 - [@is]
    CSharpImplicitExpression - [0..3)::3
        CSharpTransition - [0..1)::1 - Gen<None> - SpanEditHandler;Accepts:None
            Transition;[@];
        CSharpImplicitExpressionBody - [1..3)::2
            CSharpCodeBlock - [1..3)::2
                CSharpExpressionLiteral - [1..3)::2 - [is] - Gen<Expr> - ImplicitExpressionEditHandler;Accepts:NonWhitespace;ImplicitExpression[RTD];K14
                    Keyword;[is];
