FIR: dump nested classes in loadJava tests

Because those test are single Java files, many of them use a top-level
class as a container for multiple classes to be tested. Such tests do
almost nothing if those nested classes aren't handled.

compiler/testData/loadJava/compiledJava/kotlinSignature/StarProjection.fir.txt

@@ -3,4 +3,6 @@ public final class StarProjection : R|kotlin/Any| {
 
     public constructor(): R|test/StarProjection|
 
+    public abstract interface MyClass<T : R|ft<kotlin/CharSequence, kotlin/CharSequence?>|> : R|kotlin/Any| {
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/PropagateTypeArgumentNullable.fir.txt

@@ -1,2 +1,30 @@
 public abstract interface PropagateTypeArgumentNullable : R|kotlin/Any| {
+    public abstract interface Sub : R|test/PropagateTypeArgumentNullable.Super| {
+        public abstract fun outS(p: R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|): R|kotlin/Unit|
+
+        public abstract fun invOutS(p: R|ft<kotlin/collections/MutableList<ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>>, kotlin/collections/List<ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>>?>|): R|kotlin/Unit|
+
+        public abstract fun outOutS(p: R|ft<kotlin/collections/MutableList<ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>>, kotlin/collections/List<ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>>?>|): R|kotlin/Unit|
+
+        public abstract fun outR(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+        public abstract fun invR(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+        public abstract fun invOutR(): R|ft<kotlin/collections/MutableList<ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>>, kotlin/collections/List<ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>>?>|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun outS(p: R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|): R|kotlin/Unit|
+
+        public abstract fun invOutS(p: R|ft<kotlin/collections/MutableList<ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>>, kotlin/collections/List<ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>>?>|): R|kotlin/Unit|
+
+        public abstract fun outOutS(p: R|ft<kotlin/collections/MutableList<ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>>, kotlin/collections/List<ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>>?>|): R|kotlin/Unit|
+
+        public abstract fun outR(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+        public abstract fun invR(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+        public abstract fun invOutR(): R|ft<kotlin/collections/MutableList<ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>>, kotlin/collections/List<ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>>?>|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/parameter/ChangeProjectionKind1.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface ChangeProjectionKind1 : R|kotlin/Any| {
+    public abstract interface Sub : R|test/ChangeProjectionKind1.Super| {
+        public abstract fun foo(p: R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(p: R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/parameter/DeeplySubstitutedClassParameter.fir.txt

@@ -1,2 +1,16 @@
 public abstract interface DeeplySubstitutedClassParameter : R|kotlin/Any| {
+    public abstract interface Middle<E : R|ft<kotlin/Any, kotlin/Any?>|> : R|test/DeeplySubstitutedClassParameter.Super<ft<E, E?>>| {
+        public abstract fun foo(p: R|ft<E, E?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Sub : R|test/DeeplySubstitutedClassParameter.Middle<ft<kotlin/String, kotlin/String?>>| {
+        public abstract fun foo(p: R|ft<kotlin/String, kotlin/String?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super<T : R|ft<kotlin/Any, kotlin/Any?>|> : R|kotlin/Any| {
+        public abstract fun foo(p: R|ft<T, T?>|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/parameter/DeeplySubstitutedClassParameter2.fir.txt

@@ -1,2 +1,14 @@
 public abstract interface DeeplySubstitutedClassParameter2 : R|kotlin/Any| {
+    public abstract interface Middle<E : R|ft<kotlin/Any, kotlin/Any?>|> : R|test/DeeplySubstitutedClassParameter2.Super<ft<E, E?>>| {
+    }
+    public abstract interface Sub : R|test/DeeplySubstitutedClassParameter2.Middle<ft<kotlin/String, kotlin/String?>>| {
+        public abstract fun foo(p: R|ft<kotlin/String, kotlin/String?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super<T : R|ft<kotlin/Any, kotlin/Any?>|> : R|kotlin/Any| {
+        public abstract fun foo(p: R|ft<T, T?>|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/parameter/InheritNotVararg.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface InheritNotVararg : R|kotlin/Any| {
+    public abstract interface Sub : R|test/InheritNotVararg.Super| {
+        public abstract fun foo(vararg p: R|ft<kotlin/Array<ft<kotlin/String, kotlin/String?>>, kotlin/Array<out ft<kotlin/String, kotlin/String?>>?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(p: R|ft<kotlin/Array<ft<kotlin/String, kotlin/String?>>, kotlin/Array<out ft<kotlin/String, kotlin/String?>>?>|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/parameter/InheritNotVarargInteger.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface InheritNotVarargInteger : R|kotlin/Any| {
+    public abstract interface Sub : R|test/InheritNotVarargInteger.Super| {
+        public abstract fun foo(vararg p: R|ft<kotlin/Array<ft<kotlin/Int, kotlin/Int?>>, kotlin/Array<out ft<kotlin/Int, kotlin/Int?>>?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(p: R|ft<kotlin/Array<ft<kotlin/Int, kotlin/Int?>>, kotlin/Array<out ft<kotlin/Int, kotlin/Int?>>?>|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/parameter/InheritNotVarargNotNull.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface InheritNotVarargNotNull : R|kotlin/Any| {
+    public abstract interface Sub : R|test/InheritNotVarargNotNull.Super| {
+        public abstract fun foo(vararg p: R|ft<kotlin/Array<ft<kotlin/String, kotlin/String?>>, kotlin/Array<out ft<kotlin/String, kotlin/String?>>?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(p: R|ft<kotlin/Array<ft<kotlin/String, kotlin/String?>>, kotlin/Array<out ft<kotlin/String, kotlin/String?>>?>|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/parameter/InheritNotVarargPrimitive.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface InheritNotVarargPrimitive : R|kotlin/Any| {
+    public abstract interface Sub : R|test/InheritNotVarargPrimitive.Super| {
+        public abstract fun foo(vararg p: R|ft<kotlin/IntArray, kotlin/IntArray?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(p: R|ft<kotlin/IntArray, kotlin/IntArray?>|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/parameter/InheritNullability.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface InheritNullability : R|kotlin/Any| {
+    public abstract interface Sub : R|test/InheritNullability.Super| {
+        public abstract fun foo(p: R|@EnhancedNullability kotlin/String|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(@R|org/jetbrains/annotations/NotNull|() p: R|@EnhancedNullability kotlin/String|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/parameter/InheritVararg.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface InheritVararg : R|kotlin/Any| {
+    public abstract interface Sub : R|test/InheritVararg.Super| {
+        public abstract fun foo(p: R|ft<kotlin/Array<ft<kotlin/String, kotlin/String?>>, kotlin/Array<out ft<kotlin/String, kotlin/String?>>?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(vararg p: R|ft<kotlin/Array<ft<kotlin/String, kotlin/String?>>, kotlin/Array<out ft<kotlin/String, kotlin/String?>>?>|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/parameter/InheritVarargInteger.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface InheritVarargInteger : R|kotlin/Any| {
+    public abstract interface Sub : R|test/InheritVarargInteger.Super| {
+        public abstract fun foo(p: R|ft<kotlin/Array<ft<kotlin/Int, kotlin/Int?>>, kotlin/Array<out ft<kotlin/Int, kotlin/Int?>>?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(vararg p: R|ft<kotlin/Array<ft<kotlin/Int, kotlin/Int?>>, kotlin/Array<out ft<kotlin/Int, kotlin/Int?>>?>|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/parameter/InheritVarargNotNull.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface InheritVarargNotNull : R|kotlin/Any| {
+    public abstract interface Sub : R|test/InheritVarargNotNull.Super| {
+        public abstract fun foo(p: R|ft<kotlin/Array<ft<kotlin/String, kotlin/String?>>, kotlin/Array<out ft<kotlin/String, kotlin/String?>>?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(vararg p: R|ft<kotlin/Array<ft<kotlin/String, kotlin/String?>>, kotlin/Array<out ft<kotlin/String, kotlin/String?>>?>|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/parameter/InheritVarargPrimitive.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface InheritVarargPrimitive : R|kotlin/Any| {
+    public abstract interface Sub : R|test/InheritVarargPrimitive.Super| {
+        public abstract fun foo(p: R|ft<kotlin/IntArray, kotlin/IntArray?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(vararg p: R|ft<kotlin/IntArray, kotlin/IntArray?>|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/parameter/Kt3302.fir.txt

@@ -1,2 +1,18 @@
 public abstract interface Kt3302 : R|kotlin/Any| {
+    public abstract interface BSONObject : R|kotlin/Any| {
+        public abstract fun put(@R|org/jetbrains/annotations/NotNull|() s: R|@EnhancedNullability kotlin/String|, @R|org/jetbrains/annotations/NotNull|() o: R|@EnhancedNullability kotlin/Any|): R|ft<kotlin/Any, kotlin/Any?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
+    public abstract interface BasicBSONObject : R|test/Kt3302.LinkedHashMap<ft<kotlin/String, kotlin/String?>, ft<kotlin/Any, kotlin/Any?>>|, R|test/Kt3302.BSONObject| {
+        @R|java/lang/Override|() public abstract fun put(key: R|ft<kotlin/String, kotlin/String?>|, value: R|ft<kotlin/Any, kotlin/Any?>|): R|ft<kotlin/Any, kotlin/Any?>|
+
+    }
+    public abstract interface LinkedHashMap<K : R|ft<kotlin/Any, kotlin/Any?>|, V : R|ft<kotlin/Any, kotlin/Any?>|> : R|kotlin/Any| {
+        public abstract fun put(key: R|ft<K, K?>|, value: R|ft<V, V?>|): R|ft<V, V?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/parameter/MutableToReadOnly.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface MutableToReadOnly : R|kotlin/Any| {
+    public abstract interface Sub : R|test/MutableToReadOnly.Super| {
+        public abstract fun foo(p: R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(p: R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/parameter/NotNullToNullable.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface NotNullToNullable : R|kotlin/Any| {
+    public abstract interface Sub : R|test/NotNullToNullable.Super| {
+        public abstract fun foo(p: R|@EnhancedNullability kotlin/String|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(@R|org/jetbrains/annotations/NotNull|() p: R|@EnhancedNullability kotlin/String|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/parameter/NullableToNotNull.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface NullableToNotNull : R|kotlin/Any| {
+    public abstract interface Sub : R|test/NullableToNotNull.Super| {
+        public abstract fun foo(@R|org/jetbrains/annotations/NotNull|() p: R|@EnhancedNullability kotlin/String|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(p: R|ft<kotlin/String, kotlin/String?>|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/parameter/NullableToNotNullKotlinSignature.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface NullableToNotNullKotlinSignature : R|kotlin/Any| {
+    public abstract interface Sub : R|test/NullableToNotNullKotlinSignature.Super| {
+        public abstract fun foo(p: R|ft<kotlin/String, kotlin/String?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(p: R|ft<kotlin/String, kotlin/String?>|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/parameter/OverrideWithErasedParameter.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface OverrideWithErasedParameter : R|kotlin/Any| {
+    public abstract interface Sub<T : R|ft<kotlin/Any, kotlin/Any?>|> : R|test/OverrideWithErasedParameter.Super<ft<T, T?>>| {
+        public abstract fun foo(o: R|ft<kotlin/Any, kotlin/Any?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super<T : R|ft<kotlin/Any, kotlin/Any?>|> : R|kotlin/Any| {
+        public abstract fun foo(t: R|ft<T, T?>|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/parameter/ReadOnlyToMutable.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface ReadOnlyToMutable : R|kotlin/Any| {
+    public abstract interface Sub : R|test/ReadOnlyToMutable.Super| {
+        public abstract fun foo(p: R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(p: R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/parameter/SubclassFromGenericAndNot.fir.txt

@@ -1,2 +1,18 @@
 public abstract interface SubclassFromGenericAndNot : R|kotlin/Any| {
+    public abstract interface Generic<T : R|ft<kotlin/Any, kotlin/Any?>|> : R|kotlin/Any| {
+        public abstract fun foo(key: R|ft<T, T?>|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
+    public abstract interface NonGeneric : R|kotlin/Any| {
+        public abstract fun foo(@R|org/jetbrains/annotations/NotNull|() s: R|@EnhancedNullability kotlin/String|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
+    public abstract interface Sub : R|test/SubclassFromGenericAndNot.NonGeneric|, R|test/SubclassFromGenericAndNot.Generic<ft<kotlin/String, kotlin/String?>>| {
+        @R|java/lang/Override|() public abstract fun foo(key: R|@EnhancedNullability kotlin/String|): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/parameter/SubstitutedClassParameter.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface SubstitutedClassParameter : R|kotlin/Any| {
+    public abstract interface Sub : R|test/SubstitutedClassParameter.Super<ft<kotlin/String, kotlin/String?>>| {
+        public abstract fun foo(p: R|ft<kotlin/String, kotlin/String?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super<T : R|ft<kotlin/Any, kotlin/Any?>|> : R|kotlin/Any| {
+        public abstract fun foo(p: R|ft<T, T?>|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/parameter/SubstitutedClassParameters.fir.txt

@@ -1,2 +1,18 @@
 public abstract interface SubstitutedClassParameters : R|kotlin/Any| {
+    public abstract interface Sub : R|test/SubstitutedClassParameters.Super1<ft<kotlin/String, kotlin/String?>>|, R|test/SubstitutedClassParameters.Super2<ft<kotlin/String, kotlin/String?>>| {
+        public abstract fun foo(p: R|ft<kotlin/String, kotlin/String?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super1<T : R|ft<kotlin/Any, kotlin/Any?>|> : R|kotlin/Any| {
+        public abstract fun foo(p: R|ft<T, T?>|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
+    public abstract interface Super2<E : R|ft<kotlin/Any, kotlin/Any?>|> : R|kotlin/Any| {
+        public abstract fun foo(p: R|ft<E, E?>|): R|kotlin/Unit|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/AddNotNullJavaSubtype.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface AddNotNullJavaSubtype : R|kotlin/Any| {
+    public abstract interface Sub : R|test/AddNotNullJavaSubtype.Super| {
+        @R|org/jetbrains/annotations/NotNull|() public abstract fun foo(): R|@EnhancedNullability kotlin/String|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/CharSequence, kotlin/CharSequence?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/AddNotNullSameJavaType.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface AddNotNullSameJavaType : R|kotlin/Any| {
+    public abstract interface Sub : R|test/AddNotNullSameJavaType.Super| {
+        @R|org/jetbrains/annotations/NotNull|() public abstract fun foo(): R|@EnhancedNullability kotlin/CharSequence|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/CharSequence, kotlin/CharSequence?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/AddNullabilityJavaSubtype.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface AddNullabilityJavaSubtype : R|kotlin/Any| {
+    public abstract interface Sub : R|test/AddNullabilityJavaSubtype.Super| {
+        public abstract fun foo(): R|@EnhancedNullability kotlin/String|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        @R|org/jetbrains/annotations/NotNull|() public abstract fun foo(): R|@EnhancedNullability kotlin/CharSequence|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/AddNullabilitySameGenericType1.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface AddNullabilitySameGenericType1 : R|kotlin/Any| {
+    public abstract interface Sub : R|test/AddNullabilitySameGenericType1.Super| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/AddNullabilitySameGenericType2.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface AddNullabilitySameGenericType2 : R|kotlin/Any| {
+    public abstract interface Sub : R|test/AddNullabilitySameGenericType2.Super| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/AddNullabilitySameJavaType.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface AddNullabilitySameJavaType : R|kotlin/Any| {
+    public abstract interface Sub : R|test/AddNullabilitySameJavaType.Super| {
+        public abstract fun foo(): R|@EnhancedNullability kotlin/CharSequence|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        @R|org/jetbrains/annotations/NotNull|() public abstract fun foo(): R|@EnhancedNullability kotlin/CharSequence|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/CantMakeImmutableInSubclass.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface CantMakeImmutableInSubclass : R|kotlin/Any| {
+    public abstract interface Sub : R|test/CantMakeImmutableInSubclass.Super| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableCollection<ft<kotlin/String, kotlin/String?>>, kotlin/collections/Collection<ft<kotlin/String, kotlin/String?>>?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/DeeplySubstitutedClassParameter.fir.txt

@@ -1,2 +1,16 @@
 public abstract interface DeeplySubstitutedClassParameter : R|kotlin/Any| {
+    public abstract interface Middle<E : R|ft<kotlin/Any, kotlin/Any?>|> : R|test/DeeplySubstitutedClassParameter.Super<ft<E, E?>>| {
+        public abstract fun foo(): R|ft<E, E?>|
+
+    }
+    public abstract interface Sub : R|test/DeeplySubstitutedClassParameter.Middle<ft<kotlin/String, kotlin/String?>>| {
+        public abstract fun foo(): R|ft<kotlin/String, kotlin/String?>|
+
+    }
+    public abstract interface Super<T : R|ft<kotlin/Any, kotlin/Any?>|> : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<T, T?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/DeeplySubstitutedClassParameter2.fir.txt

@@ -1,2 +1,14 @@
 public abstract interface DeeplySubstitutedClassParameter2 : R|kotlin/Any| {
+    public abstract interface Middle<E : R|ft<kotlin/Any, kotlin/Any?>|> : R|test/DeeplySubstitutedClassParameter2.Super<ft<E, E?>>| {
+    }
+    public abstract interface Sub : R|test/DeeplySubstitutedClassParameter2.Middle<ft<kotlin/String, kotlin/String?>>| {
+        public abstract fun foo(): R|ft<kotlin/String, kotlin/String?>|
+
+    }
+    public abstract interface Super<T : R|ft<kotlin/Any, kotlin/Any?>|> : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<T, T?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/HalfSubstitutedTypeParameters.fir.txt

@@ -1,2 +1,14 @@
 public abstract interface HalfSubstitutedTypeParameters : R|kotlin/Any| {
+    public abstract interface Sub : R|test/HalfSubstitutedTypeParameters.Super| {
+        public abstract fun foo(): R|ft<test/HalfSubstitutedTypeParameters.TrickyList<ft<kotlin/Int, kotlin/Int?>, ft<kotlin/String, kotlin/String?>>, test/HalfSubstitutedTypeParameters.TrickyList<ft<kotlin/Int, kotlin/Int?>, ft<kotlin/String, kotlin/String?>>?>|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
+    public abstract interface TrickyList<X : R|ft<kotlin/Any, kotlin/Any?>|, E : R|ft<kotlin/Any, kotlin/Any?>|> : R|kotlin/collections/MutableList<ft<E, E?>>| {
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/InheritNullabilityGenericSubclassSimple.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface InheritNullabilityGenericSubclassSimple : R|kotlin/Any| {
+    public abstract interface Sub : R|test/InheritNullabilityGenericSubclassSimple.Super| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableCollection<ft<kotlin/String, kotlin/String?>>, kotlin/collections/Collection<ft<kotlin/String, kotlin/String?>>?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/InheritNullabilityJavaSubtype.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface InheritNullabilityJavaSubtype : R|kotlin/Any| {
+    public abstract interface Sub : R|test/InheritNullabilityJavaSubtype.Super| {
+        public abstract fun foo(): R|@EnhancedNullability kotlin/String|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        @R|org/jetbrains/annotations/NotNull|() public abstract fun foo(): R|@EnhancedNullability kotlin/CharSequence|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/InheritNullabilitySameGenericType.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface InheritNullabilitySameGenericType : R|kotlin/Any| {
+    public abstract interface Sub : R|test/InheritNullabilitySameGenericType.Super| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/InheritNullabilitySameJavaType.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface InheritNullabilitySameJavaType : R|kotlin/Any| {
+    public abstract interface Sub : R|test/InheritNullabilitySameJavaType.Super| {
+        public abstract fun foo(): R|@EnhancedNullability kotlin/CharSequence|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        @R|org/jetbrains/annotations/NotNull|() public abstract fun foo(): R|@EnhancedNullability kotlin/CharSequence|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/InheritProjectionKind.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface InheritProjectionKind : R|kotlin/Any| {
+    public abstract interface Sub : R|test/InheritProjectionKind.Super| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/Number, kotlin/Number?>>, kotlin/collections/List<ft<kotlin/Number, kotlin/Number?>>?>|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableCollection<ft<kotlin/Number, kotlin/Number?>>, kotlin/collections/Collection<ft<kotlin/Number, kotlin/Number?>>?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/InheritReadOnlinessOfArgument.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface InheritReadOnlinessOfArgument : R|kotlin/Any| {
+    public abstract interface Sub : R|test/InheritReadOnlinessOfArgument.Super| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>>, kotlin/collections/List<ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>>?>|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>>, kotlin/collections/List<ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>>?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/InheritReadOnlinessSameClass.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface InheritReadOnlinessSameClass : R|kotlin/Any| {
+    public abstract interface Sub : R|test/InheritReadOnlinessSameClass.Super| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/InheritReadOnlinessSubclass.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface InheritReadOnlinessSubclass : R|kotlin/Any| {
+    public abstract interface Sub : R|test/InheritReadOnlinessSubclass.Super| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableCollection<ft<kotlin/String, kotlin/String?>>, kotlin/collections/Collection<ft<kotlin/String, kotlin/String?>>?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/SameProjectionKind.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface SameProjectionKind : R|kotlin/Any| {
+    public abstract interface Sub : R|test/SameProjectionKind.Super| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableCollection<out ft<kotlin/Number, kotlin/Number?>>, kotlin/collections/Collection<out ft<kotlin/Number, kotlin/Number?>>?>|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableCollection<out ft<kotlin/Number, kotlin/Number?>>, kotlin/collections/Collection<out ft<kotlin/Number, kotlin/Number?>>?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/SubclassFromGenericAndNot.fir.txt

@@ -1,2 +1,18 @@
 public abstract interface SubclassFromGenericAndNot : R|kotlin/Any| {
+    public abstract interface Generic<T : R|ft<kotlin/Any, kotlin/Any?>|> : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<T, T?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
+    public abstract interface NonGeneric : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/String, kotlin/String?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
+    public abstract interface Sub : R|test/SubclassFromGenericAndNot.NonGeneric|, R|test/SubclassFromGenericAndNot.Generic<ft<kotlin/String, kotlin/String?>>| {
+        @R|java/lang/Override|() public abstract fun foo(): R|ft<kotlin/String, kotlin/String?>|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/SubstitutedClassParameter.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface SubstitutedClassParameter : R|kotlin/Any| {
+    public abstract interface Sub : R|test/SubstitutedClassParameter.Super<ft<kotlin/String, kotlin/String?>>| {
+        public abstract fun foo(): R|ft<kotlin/String, kotlin/String?>|
+
+    }
+    public abstract interface Super<T : R|ft<kotlin/Any, kotlin/Any?>|> : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<T, T?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/SubstitutedClassParameters.fir.txt

@@ -1,2 +1,18 @@
 public abstract interface SubstitutedClassParameters : R|kotlin/Any| {
+    public abstract interface Sub : R|test/SubstitutedClassParameters.Super1<ft<kotlin/String, kotlin/String?>>|, R|test/SubstitutedClassParameters.Super2<ft<kotlin/String, kotlin/String?>>| {
+        public abstract fun foo(): R|ft<kotlin/String, kotlin/String?>|
+
+    }
+    public abstract interface Super1<T : R|ft<kotlin/Any, kotlin/Any?>|> : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<T, T?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
+    public abstract interface Super2<E : R|ft<kotlin/Any, kotlin/Any?>|> : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<E, E?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/TwoSuperclassesConflictingProjectionKinds.fir.txt

@@ -1,2 +1,18 @@
 public abstract interface TwoSuperclassesConflictingProjectionKinds : R|kotlin/Any| {
+    public abstract interface Sub : R|test/TwoSuperclassesConflictingProjectionKinds.Super1|, R|test/TwoSuperclassesConflictingProjectionKinds.Super2| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableCollection<ft<kotlin/CharSequence, kotlin/CharSequence?>>, kotlin/collections/Collection<ft<kotlin/CharSequence, kotlin/CharSequence?>>?>|
+
+    }
+    public abstract interface Super1 : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableCollection<ft<kotlin/CharSequence, kotlin/CharSequence?>>, kotlin/collections/Collection<ft<kotlin/CharSequence, kotlin/CharSequence?>>?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
+    public abstract interface Super2 : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableCollection<ft<kotlin/CharSequence, kotlin/CharSequence?>>, kotlin/collections/Collection<ft<kotlin/CharSequence, kotlin/CharSequence?>>?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/TwoSuperclassesInvariantAndCovariantInferMutability.fir.txt

@@ -1,2 +1,18 @@
 public abstract interface TwoSuperclassesInvariantAndCovariantInferMutability : R|kotlin/Any| {
+    public abstract interface Sub : R|test/TwoSuperclassesInvariantAndCovariantInferMutability.Super1|, R|test/TwoSuperclassesInvariantAndCovariantInferMutability.Super2| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>>, kotlin/collections/List<ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>>?>|
+
+    }
+    public abstract interface Super1 : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>>, kotlin/collections/List<ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>>?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
+    public abstract interface Super2 : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>>, kotlin/collections/List<ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>>?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/TwoSuperclassesInvariantAndCovariantInferNullability.fir.txt

@@ -1,2 +1,18 @@
 public abstract interface TwoSuperclassesInvariantAndCovariantInferNullability : R|kotlin/Any| {
+    public abstract interface Sub : R|test/TwoSuperclassesInvariantAndCovariantInferNullability.Super1|, R|test/TwoSuperclassesInvariantAndCovariantInferNullability.Super2| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+    }
+    public abstract interface Super1 : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
+    public abstract interface Super2 : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/TwoSuperclassesMutableAndNot.fir.txt

@@ -1,2 +1,18 @@
 public abstract interface TwoSuperclassesMutableAndNot : R|kotlin/Any| {
+    public abstract interface Sub : R|test/TwoSuperclassesMutableAndNot.Super1|, R|test/TwoSuperclassesMutableAndNot.Super2| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+    }
+    public abstract interface Super1 : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableCollection<ft<kotlin/String, kotlin/String?>>, kotlin/collections/Collection<ft<kotlin/String, kotlin/String?>>?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
+    public abstract interface Super2 : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/TwoSuperclassesReturnJavaSubtype.fir.txt

@@ -1,2 +1,18 @@
 public abstract interface TwoSuperclassesReturnJavaSubtype : R|kotlin/Any| {
+    public abstract interface Sub : R|test/TwoSuperclassesReturnJavaSubtype.Super1|, R|test/TwoSuperclassesReturnJavaSubtype.Super2| {
+        public abstract fun foo(): R|@EnhancedNullability kotlin/String|
+
+    }
+    public abstract interface Super1 : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/CharSequence, kotlin/CharSequence?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
+    public abstract interface Super2 : R|kotlin/Any| {
+        @R|org/jetbrains/annotations/NotNull|() public abstract fun foo(): R|@EnhancedNullability kotlin/CharSequence|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/TwoSuperclassesReturnSameJavaType.fir.txt

@@ -1,2 +1,18 @@
 public abstract interface TwoSuperclassesReturnSameJavaType : R|kotlin/Any| {
+    public abstract interface Sub : R|test/TwoSuperclassesReturnSameJavaType.Super1|, R|test/TwoSuperclassesReturnSameJavaType.Super2| {
+        public abstract fun foo(): R|@EnhancedNullability kotlin/CharSequence|
+
+    }
+    public abstract interface Super1 : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/CharSequence, kotlin/CharSequence?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
+    public abstract interface Super2 : R|kotlin/Any| {
+        @R|org/jetbrains/annotations/NotNull|() public abstract fun foo(): R|@EnhancedNullability kotlin/CharSequence|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/TwoSuperclassesSupplementNotNull.fir.txt

@@ -1,2 +1,18 @@
 public abstract interface TwoSuperclassesSupplementNotNull : R|kotlin/Any| {
+    public abstract interface Sub : R|test/TwoSuperclassesSupplementNotNull.Super1|, R|test/TwoSuperclassesSupplementNotNull.Super2| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+    }
+    public abstract interface Super1 : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
+    public abstract interface Super2 : R|kotlin/Any| {
+        public abstract fun foo(): R|ft<kotlin/collections/MutableList<ft<kotlin/String, kotlin/String?>>, kotlin/collections/List<ft<kotlin/String, kotlin/String?>>?>|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/TypeParamOfClass.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface TypeParamOfClass : R|kotlin/Any| {
+    public abstract interface Sub<T : R|ft<kotlin/Any, kotlin/Any?>|> : R|test/TypeParamOfClass.Super<ft<T, T?>>| {
+        public abstract fun foo(): R|@EnhancedNullability T|
+
+    }
+    public abstract interface Super<T : R|ft<kotlin/Any, kotlin/Any?>|> : R|kotlin/Any| {
+        @R|org/jetbrains/annotations/NotNull|() public abstract fun foo(): R|@EnhancedNullability T!!|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/TypeParamOfClassSubstituted.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface TypeParamOfClassSubstituted : R|kotlin/Any| {
+    public abstract interface Sub : R|test/TypeParamOfClassSubstituted.Super<ft<kotlin/String, kotlin/String?>>| {
+        public abstract fun foo(): R|@EnhancedNullability kotlin/String|
+
+    }
+    public abstract interface Super<T : R|ft<kotlin/Any, kotlin/Any?>|> : R|kotlin/Any| {
+        @R|org/jetbrains/annotations/NotNull|() public abstract fun foo(): R|@EnhancedNullability T!!|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/return/TypeParamOfFun.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface TypeParamOfFun : R|kotlin/Any| {
+    public abstract interface Sub : R|test/TypeParamOfFun.Super| {
+        public abstract fun <E : R|ft<kotlin/Any, kotlin/Any?>|> foo(): R|@EnhancedNullability E!!|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        @R|org/jetbrains/annotations/NotNull|() public abstract fun <T : R|ft<kotlin/Any, kotlin/Any?>|> foo(): R|@EnhancedNullability T!!|
+
+        public abstract fun dummy(): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/typeParameter/InheritNullability.fir.txt

@@ -1,2 +1,10 @@
 public abstract interface InheritNullability : R|kotlin/Any| {
+    public abstract interface Sub : R|test/InheritNullability.Super| {
+        public abstract fun <B : R|ft<kotlin/CharSequence, kotlin/CharSequence?>|> foo(b: R|ft<B, B?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun <A : R|ft<kotlin/CharSequence, kotlin/CharSequence?>|> foo(a: R|ft<A, A?>|): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/typeParameter/TwoBounds.fir.txt

@@ -1,2 +1,10 @@
 public abstract interface TwoBounds : R|kotlin/Any| {
+    public abstract interface Sub : R|test/TwoBounds.Super| {
+        public abstract fun <B : R|ft<kotlin/CharSequence, kotlin/CharSequence?>|, R|ft<kotlin/Cloneable, kotlin/Cloneable?>|> foo(b: R|ft<B, B?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun <A : R|ft<kotlin/CharSequence, kotlin/CharSequence?>|, R|ft<kotlin/Cloneable, kotlin/Cloneable?>|> foo(a: R|ft<A, A?>|): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/typeParameter/TwoSuperclasses.fir.txt

@@ -1,2 +1,14 @@
 public abstract interface TwoSuperclasses : R|kotlin/Any| {
+    public abstract interface Sub : R|test/TwoSuperclasses.Super1|, R|test/TwoSuperclasses.Super2| {
+        public abstract fun <C : R|ft<kotlin/CharSequence, kotlin/CharSequence?>|> foo(c: R|ft<C, C?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super1 : R|kotlin/Any| {
+        public abstract fun <A : R|ft<kotlin/CharSequence, kotlin/CharSequence?>|> foo(a: R|ft<A, A?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super2 : R|kotlin/Any| {
+        public abstract fun <B : R|ft<kotlin/CharSequence, kotlin/CharSequence?>|> foo(a: R|ft<B, B?>|): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/typeParameter/TwoTypeParameters.fir.txt

@@ -1,2 +1,10 @@
 public abstract interface TwoTypeParameters : R|kotlin/Any| {
+    public abstract interface Sub : R|test/TwoTypeParameters.Super| {
+        public abstract fun <B : R|ft<kotlin/CharSequence, kotlin/CharSequence?>|, A : R|ft<kotlin/Cloneable, kotlin/Cloneable?>|> foo(b: R|ft<B, B?>|, a: R|ft<A, A?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun <A : R|ft<kotlin/CharSequence, kotlin/CharSequence?>|, B : R|ft<kotlin/Cloneable, kotlin/Cloneable?>|> foo(a: R|ft<A, A?>|, b: R|ft<B, B?>|): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/typeParameter/UseParameterAsUpperBound.fir.txt

@@ -1,2 +1,12 @@
 public abstract interface UseParameterAsUpperBound : R|kotlin/Any| {
+    public abstract interface Sub : R|test/UseParameterAsUpperBound.Super| {
+        public abstract fun <B : R|ft<kotlin/Any, kotlin/Any?>|, A : R|ft<B, B?>|> foo(b: R|ft<B, B?>|, a: R|ft<A, A?>|): R|kotlin/Unit|
+
+        public abstract fun <A : R|ft<kotlin/Any, kotlin/Any?>|, B : R|ft<A, A?>|> foo(a: R|ft<A, A?>|, b: R|ft<B, B?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun <A : R|ft<kotlin/Any, kotlin/Any?>|, B : R|ft<A, A?>|> foo(a: R|ft<A, A?>|, b: R|ft<B, B?>|): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/typeParameter/UseParameterInUpperBound.fir.txt

@@ -1,2 +1,10 @@
 public abstract interface UseParameterInUpperBound : R|kotlin/Any| {
+    public abstract interface Sub : R|test/UseParameterInUpperBound.Super| {
+        public abstract fun <B : R|ft<kotlin/Any, kotlin/Any?>|, A : R|ft<kotlin/collections/MutableList<ft<B, B?>>, kotlin/collections/List<ft<B, B?>>?>|> foo(b: R|ft<B, B?>|, a: R|ft<A, A?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun <A : R|ft<kotlin/Any, kotlin/Any?>|, B : R|ft<kotlin/collections/MutableList<ft<A, A?>>, kotlin/collections/List<ft<A, A?>>?>|> foo(a: R|ft<A, A?>|, b: R|ft<B, B?>|): R|kotlin/Unit|
+
+    }
 }

compiler/testData/loadJava/compiledJava/kotlinSignature/propagation/typeParameter/UseParameterInUpperBoundWithKotlinSignature.fir.txt

@@ -1,2 +1,10 @@
 public abstract interface UseParameterInUpperBoundWithKotlinSignature : R|kotlin/Any| {
+    public abstract interface Sub : R|test/UseParameterInUpperBoundWithKotlinSignature.Super| {
+        public abstract fun <B : R|ft<kotlin/Any, kotlin/Any?>|, A : R|ft<kotlin/collections/MutableList<ft<B, B?>>, kotlin/collections/List<ft<B, B?>>?>|> foo(b: R|ft<B, B?>|, a: R|ft<A, A?>|): R|kotlin/Unit|
+
+    }
+    public abstract interface Super : R|kotlin/Any| {
+        public abstract fun <A : R|ft<kotlin/Any, kotlin/Any?>|, B : R|ft<kotlin/collections/MutableList<ft<A, A?>>, kotlin/collections/List<ft<A, A?>>?>|> foo(a: R|ft<A, A?>|, b: R|ft<B, B?>|): R|kotlin/Unit|
+
+    }
 }