Use TemplatedDecl.Parameters cuz Class.TemplateParameters may not be available at this point

src/Generator/Generators/C/CppTypePrinter.cs

@@ -5,6 +5,7 @@ using System.Linq;
 using CppSharp.AST;
 using CppSharp.AST.Extensions;
 using CppSharp.Generators.CSharp;
+using CppSharp.Passes;
 using CppSharp.Types;
 
 namespace CppSharp.Generators.C
@@ -577,11 +578,11 @@ namespace CppSharp.Generators.C
                         args.Add(arg.Declaration.Visit(this));
                         break;
                     case TemplateArgument.ArgumentKind.Integral:
-                        Class template = specialization.TemplatedDecl.TemplatedClass;
-                        var nonTypeTemplateParameter = template.TemplateParameters[i]
+                        ClassTemplate template = specialization.TemplatedDecl;
+                        var nonTypeTemplateParameter = template.Parameters[i]
                             as NonTypeTemplateParameter;
                         if (!(nonTypeTemplateParameter?.DefaultArgument is
-                              BuiltinTypeExpressionObsolete builtinExpression) ||
+                                BuiltinTypeExpressionObsolete builtinExpression) ||
                             builtinExpression.Value != arg.Integral)
                         {
                             args.Add(arg.Integral.ToString(CultureInfo.InvariantCulture));

tests/CSharp/CSharpTemplates.h

@@ -944,3 +944,22 @@ public:
 
 };
 const FloatArrayF<6> I6{ 1., 1., 1., 0., 0., 0. };
+
+// KEEP ORDER OTHERWISE TEST WONT WORK
+namespace IncompleteClassTemplatesTests
+{
+    template <size_t Size>
+    struct StructSizeT {};
+
+    template <typename T>
+    struct StructT
+    {
+        template<typename U>
+        struct Inc { };
+    };
+
+    struct Instantiation
+    {
+        StructT<StructSizeT<4000>> st;
+    };
+}