diff --git a/src/Directory.Build.props b/src/Directory.Build.props
index 19d729c..6746357 100644
--- a/src/Directory.Build.props
+++ b/src/Directory.Build.props
@@ -1,6 +1,6 @@
 <Project>
     <PropertyGroup Label="Packaging">
-        <Version>2.0.1-pre03</Version>
+        <Version>2.0.1-pre04</Version>
         <Copyright>Copyright © JetBrains 2024</Copyright>
 
         <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
diff --git a/src/Refasmer/Importer/ImportLogic.cs b/src/Refasmer/Importer/ImportLogic.cs
index 4ba9cfd..2ee152d 100644
--- a/src/Refasmer/Importer/ImportLogic.cs
+++ b/src/Refasmer/Importer/ImportLogic.cs
@@ -619,17 +619,23 @@ private IEnumerable<TypeDefinitionHandle> CalculateInternalTypesToPreserve(
 
             var parentTypes = new List<EntityHandle>();
             if (!type.BaseType.IsNil) parentTypes.Add(type.BaseType);
-            foreach (var interfaceImpl in type.GetInterfaceImplementations())
+            foreach (var interfaceImplHandle in type.GetInterfaceImplementations())
             {
-                var @interface = _reader.GetInterfaceImplementation(interfaceImpl);
-                parentTypes.Add(@interface.Interface);
+                var interfaceImpl = _reader.GetInterfaceImplementation(interfaceImplHandle);
+                parentTypes.Add(interfaceImpl.Interface);
             }
 
             foreach (var parentTypeHandle in parentTypes)
             {
-                if (parentTypeHandle.Kind == HandleKind.TypeDefinition)
+                switch (parentTypeHandle.Kind)
                 {
-                    candidateTypes.Add((TypeDefinitionHandle)parentTypeHandle);
+                    case HandleKind.TypeDefinition:
+                        candidateTypes.Add((TypeDefinitionHandle)parentTypeHandle);
+                        break;
+                    case HandleKind.TypeSpecification:
+                        var specification = _reader.GetTypeSpecification((TypeSpecificationHandle)parentTypeHandle);
+                        AcceptTypeSignature(specification.Signature, collector);
+                        break;
                 }
             }
 
diff --git a/tests/Refasmer.Tests/IntegrationTests.cs b/tests/Refasmer.Tests/IntegrationTests.cs
index 939b549..2256709 100644
--- a/tests/Refasmer.Tests/IntegrationTests.cs
+++ b/tests/Refasmer.Tests/IntegrationTests.cs
@@ -49,18 +49,19 @@ await VerifyTypeContents(
 
     [TestCase("PublicClassWithInternalTypeInApi", "Class1ToBeMarkedInternal")]
     [TestCase("PublicClassDerivingFromInternal", "Class2ToBeMarkedInternal")]
-    [TestCase("PublicClassImplementingInternal", "InterfaceToBeMarkedInternal")]
-    public async Task InternalTypeInPublicApi(string mainClassName, string auxiliaryClassName)
+    [TestCase("PublicClassImplementingInternal", "IInterface1ToBeMarkedInternal")]
+    [TestCase("PublicClassWithInternalInterfaceImpl", "Class3ToBeMarkedInternal,IInterface2ToBeMarkedInternal`1")]
+    public async Task InternalTypeInPublicApi(string mainClassName, string auxiliaryClassNames)
     {
         var assemblyPath = await BuildTestAssemblyWithInternalTypeInPublicApi();
         var resultAssembly = RefasmTestAssembly(assemblyPath, omitNonApiMembers: true);
 
         var fullMainClassName = $"RefasmerTestAssembly.{mainClassName}";
-        var fullAuxiliaryClassName = $"RefasmerTestAssembly.{auxiliaryClassName}";
+        var fullAuxiliaryClassNames = auxiliaryClassNames.Split(',').Select(x => $"RefasmerTestAssembly.{x}");
 
         await VerifyTypeContents(
             resultAssembly,
-            [fullMainClassName, fullAuxiliaryClassName],
+            [fullMainClassName, ..fullAuxiliaryClassNames],
             parameters: [mainClassName]);
     }
 }
diff --git a/tests/Refasmer.Tests/Printer.cs b/tests/Refasmer.Tests/Printer.cs
index 36a0a9c..d2ec172 100644
--- a/tests/Refasmer.Tests/Printer.cs
+++ b/tests/Refasmer.Tests/Printer.cs
@@ -8,7 +8,8 @@ public static class Printer
     public static void PrintType(TypeDefinition type, StringBuilder printout, string indent = "")
     {
         var access = GetAccessString(type);
-        printout.AppendLine($"{indent}{access} type: {type.FullName}");
+        var typeKind = GetTypeKindString(type);
+        printout.AppendLine($"{indent}{access} {typeKind}: {type.FullName}");
         if (type.HasFields)
         {
             printout.AppendLine($"{indent}fields:");
@@ -34,10 +35,15 @@ public static void PrintType(TypeDefinition type, StringBuilder printout, string
                     }
                 }
 
-                printout.AppendLine($"{indent}): {method.ReturnType}:");
-                foreach (var instruction in method.Body.Instructions)
+                printout.AppendLine($"): {method.ReturnType}:");
+                if (method.IsAbstract)
+                    printout.AppendLine($"{indent}  - <abstract>");
+                else
                 {
-                    printout.AppendLine($"{indent}  - {instruction}");
+                    foreach (var instruction in method.Body.Instructions)
+                    {
+                        printout.AppendLine($"{indent}  - {instruction}");
+                    }
                 }
             }
         }
@@ -62,4 +68,14 @@ private static string GetAccessString(TypeDefinition type)
         if (type.IsNestedFamilyAndAssembly) return "private protected";
         return "internal";
     }
+
+    private static string GetTypeKindString(TypeDefinition typeDefinition)
+    {
+        var result = new StringBuilder();
+        if (typeDefinition.IsInterface) result.Append("interface");
+        else if (typeDefinition.IsAbstract) result.Append("abstract ");
+        if (typeDefinition.IsValueType) result.Append("struct");
+        else if (typeDefinition.IsClass) result.Append("class");
+        return result.ToString();
+    }
 }
diff --git a/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.BlittableGraph.verified.txt b/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.BlittableGraph.verified.txt
index 5d625ae..1b156e7 100644
--- a/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.BlittableGraph.verified.txt
+++ b/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.BlittableGraph.verified.txt
@@ -1,3 +1,3 @@
-public type: RefasmerTestAssembly.BlittableGraph
+public struct: RefasmerTestAssembly.BlittableGraph
 fields:
 - <SyntheticNonEmptyStructMarker>: System.Int32
diff --git a/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.BlittableStructWithPrivateFields.verified.txt b/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.BlittableStructWithPrivateFields.verified.txt
index 2d4e000..f803a52 100644
--- a/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.BlittableStructWithPrivateFields.verified.txt
+++ b/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.BlittableStructWithPrivateFields.verified.txt
@@ -1,3 +1,3 @@
-public type: RefasmerTestAssembly.BlittableStructWithPrivateFields
+public struct: RefasmerTestAssembly.BlittableStructWithPrivateFields
 fields:
 - <SyntheticNonEmptyStructMarker>: System.Int32
diff --git a/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.EmptyStructWithStaticMember.verified.txt b/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.EmptyStructWithStaticMember.verified.txt
index cb9c757..fb20c2b 100644
--- a/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.EmptyStructWithStaticMember.verified.txt
+++ b/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.EmptyStructWithStaticMember.verified.txt
@@ -1 +1 @@
-public type: RefasmerTestAssembly.EmptyStructWithStaticMember
+public struct: RefasmerTestAssembly.EmptyStructWithStaticMember
diff --git a/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.NonBlittableGraph.verified.txt b/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.NonBlittableGraph.verified.txt
index 2b70304..a9e6a31 100644
--- a/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.NonBlittableGraph.verified.txt
+++ b/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.NonBlittableGraph.verified.txt
@@ -1,3 +1,3 @@
-public type: RefasmerTestAssembly.NonBlittableGraph
+public struct: RefasmerTestAssembly.NonBlittableGraph
 fields:
 - <SyntheticNonEmptyStructMarker>: System.Int32
diff --git a/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.NonBlittableStructWithPrivateFields.verified.txt b/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.NonBlittableStructWithPrivateFields.verified.txt
index 3e5a629..dd46266 100644
--- a/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.NonBlittableStructWithPrivateFields.verified.txt
+++ b/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.NonBlittableStructWithPrivateFields.verified.txt
@@ -1,3 +1,3 @@
-public type: RefasmerTestAssembly.NonBlittableStructWithPrivateFields
+public struct: RefasmerTestAssembly.NonBlittableStructWithPrivateFields
 fields:
 - <SyntheticNonEmptyStructMarker>: System.Int32
diff --git a/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.NonEmptyStructWithStaticMember.verified.txt b/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.NonEmptyStructWithStaticMember.verified.txt
index a5eb51c..e62402a 100644
--- a/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.NonEmptyStructWithStaticMember.verified.txt
+++ b/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.NonEmptyStructWithStaticMember.verified.txt
@@ -1,3 +1,3 @@
-public type: RefasmerTestAssembly.NonEmptyStructWithStaticMember
+public struct: RefasmerTestAssembly.NonEmptyStructWithStaticMember
 fields:
 - <SyntheticNonEmptyStructMarker>: System.Int32
diff --git a/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.PublicClassWithPrivateFields.verified.txt b/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.PublicClassWithPrivateFields.verified.txt
index b3096b0..059e029 100644
--- a/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.PublicClassWithPrivateFields.verified.txt
+++ b/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.PublicClassWithPrivateFields.verified.txt
@@ -1,4 +1,4 @@
-public type: RefasmerTestAssembly.PublicClassWithPrivateFields
+public class: RefasmerTestAssembly.PublicClassWithPrivateFields
 fields:
 - PublicInt: System.Int32
 methods:
diff --git a/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.PublicStructWithPrivateFields.verified.txt b/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.PublicStructWithPrivateFields.verified.txt
index ed60ee4..999eb30 100644
--- a/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.PublicStructWithPrivateFields.verified.txt
+++ b/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.PublicStructWithPrivateFields.verified.txt
@@ -1,3 +1,3 @@
-public type: RefasmerTestAssembly.PublicStructWithPrivateFields
+public struct: RefasmerTestAssembly.PublicStructWithPrivateFields
 fields:
 - PublicInt: System.Int32
diff --git a/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.StructWithNestedPrivateTypes.verified.txt b/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.StructWithNestedPrivateTypes.verified.txt
index 08cefb4..768d907 100644
--- a/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.StructWithNestedPrivateTypes.verified.txt
+++ b/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.StructWithNestedPrivateTypes.verified.txt
@@ -1,7 +1,7 @@
-public type: RefasmerTestAssembly.StructWithNestedPrivateTypes
+public struct: RefasmerTestAssembly.StructWithNestedPrivateTypes
 fields:
 - <SyntheticNonEmptyStructMarker>: System.Int32
 types:
-  internal type: RefasmerTestAssembly.StructWithNestedPrivateTypes/UnusedPublicStruct
+  internal struct: RefasmerTestAssembly.StructWithNestedPrivateTypes/UnusedPublicStruct
   fields:
   - <SyntheticNonEmptyStructMarker>: System.Int32
diff --git a/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.UnsafeClassWithFunctionPointer.verified.txt b/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.UnsafeClassWithFunctionPointer.verified.txt
index 679ec12..d81374a 100644
--- a/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.UnsafeClassWithFunctionPointer.verified.txt
+++ b/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedTypeOmitNonApi_typeName=RefasmerTestAssembly.UnsafeClassWithFunctionPointer.verified.txt
@@ -1,4 +1,4 @@
-public type: RefasmerTestAssembly.UnsafeClassWithFunctionPointer
+public class: RefasmerTestAssembly.UnsafeClassWithFunctionPointer
 methods:
 - MethodWithFunctionPointer(method System.Void *() functionPointer): System.Void:
 - .ctor(): System.Void:
diff --git a/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedType_typeName=RefasmerTestAssembly.NonBlittableGraph.verified.txt b/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedType_typeName=RefasmerTestAssembly.NonBlittableGraph.verified.txt
index 940bc52..2cd2c1c 100644
--- a/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedType_typeName=RefasmerTestAssembly.NonBlittableGraph.verified.txt
+++ b/tests/Refasmer.Tests/data/IntegrationTests.CheckRefasmedType_typeName=RefasmerTestAssembly.NonBlittableGraph.verified.txt
@@ -1,11 +1,11 @@
-public type: RefasmerTestAssembly.NonBlittableGraph
+public struct: RefasmerTestAssembly.NonBlittableGraph
 fields:
 - x: RefasmerTestAssembly.NonBlittableGraph/DubiouslyBlittableType
 types:
-  private type: RefasmerTestAssembly.NonBlittableGraph/DubiouslyBlittableType
+  private struct: RefasmerTestAssembly.NonBlittableGraph/DubiouslyBlittableType
   fields:
   - x: RefasmerTestAssembly.NonBlittableGraph/DubiouslyBlittableType/NonBlittableType
   types:
-    private type: RefasmerTestAssembly.NonBlittableGraph/DubiouslyBlittableType/NonBlittableType
+    private struct: RefasmerTestAssembly.NonBlittableGraph/DubiouslyBlittableType/NonBlittableType
     fields:
     - x: System.String
diff --git a/tests/Refasmer.Tests/data/IntegrationTests.InternalTypeInPublicApi_mainClassName=PublicClassImplementingInternal.verified.txt b/tests/Refasmer.Tests/data/IntegrationTests.InternalTypeInPublicApi_mainClassName=PublicClassImplementingInternal.verified.txt
index c287ddf..6beb1d5 100644
--- a/tests/Refasmer.Tests/data/IntegrationTests.InternalTypeInPublicApi_mainClassName=PublicClassImplementingInternal.verified.txt
+++ b/tests/Refasmer.Tests/data/IntegrationTests.InternalTypeInPublicApi_mainClassName=PublicClassImplementingInternal.verified.txt
@@ -1,4 +1,4 @@
-public type: RefasmerTestAssembly.PublicClassImplementingInternal
+public class: RefasmerTestAssembly.PublicClassImplementingInternal
 methods:
 - .ctor(): System.Void:
-internal type: RefasmerTestAssembly.InterfaceToBeMarkedInternal
+internal interface: RefasmerTestAssembly.IInterface1ToBeMarkedInternal
diff --git a/tests/Refasmer.Tests/data/IntegrationTests.InternalTypeInPublicApi_mainClassName=PublicClassWithInternalInterfaceImpl.verified.txt b/tests/Refasmer.Tests/data/IntegrationTests.InternalTypeInPublicApi_mainClassName=PublicClassWithInternalInterfaceImpl.verified.txt
new file mode 100644
index 0000000..ce5a3ce
--- /dev/null
+++ b/tests/Refasmer.Tests/data/IntegrationTests.InternalTypeInPublicApi_mainClassName=PublicClassWithInternalInterfaceImpl.verified.txt
@@ -0,0 +1,9 @@
+public class: RefasmerTestAssembly.PublicClassWithInternalInterfaceImpl
+methods:
+- RefasmerTestAssembly.IInterface2ToBeMarkedInternal<RefasmerTestAssembly.Class3ToBeMarkedInternal>.Foo(): RefasmerTestAssembly.Class3ToBeMarkedInternal:
+- .ctor(): System.Void:
+internal class: RefasmerTestAssembly.Class3ToBeMarkedInternal
+public interface: RefasmerTestAssembly.IInterface2ToBeMarkedInternal`1
+methods:
+- Foo(): T:
+  - <abstract>
diff --git a/tests/RefasmerTestAssembly/InternalClassInApi.cs b/tests/RefasmerTestAssembly/InternalClassInApi.cs
index ee17961..67e6d92 100644
--- a/tests/RefasmerTestAssembly/InternalClassInApi.cs
+++ b/tests/RefasmerTestAssembly/InternalClassInApi.cs
@@ -1,9 +1,16 @@
+using System;
+
 namespace RefasmerTestAssembly;
 
 // Post-processed and converted to internal by tests:
 public class Class1ToBeMarkedInternal;
 public class Class2ToBeMarkedInternal;
-public class InterfaceToBeMarkedInternal;
+public class Class3ToBeMarkedInternal;
+public interface IInterface1ToBeMarkedInternal;
+public interface IInterface2ToBeMarkedInternal<T>
+{
+    T Foo();
+}
 
 public class PublicClassWithInternalTypeInApi
 {
@@ -11,4 +18,9 @@ public void Accept(Class1ToBeMarkedInternal argument) {}
 }
 
 public class PublicClassDerivingFromInternal : Class2ToBeMarkedInternal;
-public class PublicClassImplementingInternal : InterfaceToBeMarkedInternal;
+public class PublicClassImplementingInternal : IInterface1ToBeMarkedInternal;
+
+public class PublicClassWithInternalInterfaceImpl : IInterface2ToBeMarkedInternal<Class3ToBeMarkedInternal>
+{
+    Class3ToBeMarkedInternal IInterface2ToBeMarkedInternal<Class3ToBeMarkedInternal>.Foo() => throw new Exception("123");
+}
\ No newline at end of file