CSharpCodeBlock - [0..7)::7 - [@foo(()]
    CSharpImplicitExpression - [0..7)::7
        CSharpTransition - [0..1)::1 - Gen<None> - SpanEditHandler;Accepts:None
            Transition;[@];
        CSharpImplicitExpressionBody - [1..7)::6
            CSharpCodeBlock - [1..7)::6
                CSharpExpressionLiteral - [1..7)::6 - [foo(()] - Gen<Expr> - ImplicitExpressionEditHandler;Accepts:Any;ImplicitExpression[RTD];K14
                    Identifier;[foo];
                    LeftParenthesis;[(];
                    LeftParenthesis;[(];
                    RightParenthesis;[)];
