<UserControl
    x:Class="NoesisMinimalExample.NoesisMinimalExampleMainView"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:noesisGuiExtensions="clr-namespace:NoesisGUIExtensions;assembly=Noesis.GUI.Extensions">
    <noesisGuiExtensions:Xaml.Dependencies>
        <noesisGuiExtensions:Dependency Source="Controls/Test/TestControl.xaml" />
    </noesisGuiExtensions:Xaml.Dependencies>
</UserControl>

Produces the following error at compile time:

Assets/NoesisMinimalExampleMainView.xaml(7,9): Cannot create 'System.Collections.Generic.List`1[[NoesisGUIExtensions.Dependency, Noesis.NoesisGUI, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null]]', component not registered
UnityEngine.Debug:Log (object,UnityEngine.Object)
NoesisPostprocessor/<>c__DisplayClass4_0:<Update>b__1 (string) (at C:/UnityPackages/NoesisGUI-Unity-3.2.9-Indie/Editor/NoesisPostprocessor.cs:120)
Noesis.GUI:LoadComponent (object,string) (at C:/UnityPackages/NoesisGUI-Unity-3.2.9-Indie/Runtime/API/Core/NoesisGUI.cs:354)
NoesisUnity:LoadComponent (object,string) (at C:/UnityPackages/NoesisGUI-Unity-3.2.9-Indie/Runtime/NoesisUnity.cs:325)
NoesisMinimalExample.NoesisMinimalExampleMainView:InitializeComponent () (at Assets/NoesisMinimalExampleMainView.xaml.cs:37)
NoesisMinimalExample.NoesisMinimalExampleMainView:.ctor () (at Assets/NoesisMinimalExampleMainView.xaml.cs:24)
(wrapper dynamic-method) object:lambda_method (System.Runtime.CompilerServices.Closure)
Noesis.Extend:CreateInstance (intptr,intptr) (at C:/UnityPackages/NoesisGUI-Unity-3.2.9-Indie/Runtime/API/Core/Extend.cs:5814)
Noesis.GUI:LoadXaml (System.IO.Stream,string) (at C:/UnityPackages/NoesisGUI-Unity-3.2.9-Indie/Runtime/API/Core/NoesisGUI.cs:302)
NoesisXaml:Load () (at C:/UnityPackages/NoesisGUI-Unity-3.2.9-Indie/Runtime/NoesisXaml.cs:17)
NoesisPostprocessor:Update () (at C:/UnityPackages/NoesisGUI-Unity-3.2.9-Indie/Editor/NoesisPostprocessor.cs:125)
UnityEditor.EditorApplication:Internal_CallUpdateFunctions ()

Same happens at runtime.