Document - 
    NamespaceDeclaration -  - Test
        UsingDirective - (3:1,1 [14] ) - System
        UsingDirective - (18:2,1 [34] ) - System.Collections.Generic
        UsingDirective - (53:3,1 [19] ) - System.Linq
        UsingDirective - (73:4,1 [30] ) - System.Threading.Tasks
        UsingDirective - (104:5,1 [39] ) - Microsoft.AspNetCore.Components
        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase - 
            MethodDeclaration -  - protected override - void - BuildRenderTree
                MarkupElement - (0:0,0 [18] x:\dir\subdir\Test\TestComponent.cshtml) - elem
                    HtmlAttribute - (5:0,5 [10] x:\dir\subdir\Test\TestComponent.cshtml) -  attr= - 
                        CSharpExpressionAttributeValue - (11:0,11 [4] x:\dir\subdir\Test\TestComponent.cshtml) - 
                            LazyIntermediateToken - (12:0,12 [3] x:\dir\subdir\Test\TestComponent.cshtml) - CSharp - Foo
            CSharpCode - (31:1,11 [29] x:\dir\subdir\Test\TestComponent.cshtml)
                LazyIntermediateToken - (31:1,11 [29] x:\dir\subdir\Test\TestComponent.cshtml) - CSharp - \n        int Foo = 18;\n    
