diff --git a/plugins/fir/fir-plugin-prototype/testData/diagnostics/memberGen/classWithGeneratedMembersAndNestedClass.fir.txt b/plugins/fir/fir-plugin-prototype/testData/diagnostics/memberGen/classWithGeneratedMembersAndNestedClass.fir.txt
index 9f0ac73d4c4..4084263d735 100644
--- a/plugins/fir/fir-plugin-prototype/testData/diagnostics/memberGen/classWithGeneratedMembersAndNestedClass.fir.txt
+++ b/plugins/fir/fir-plugin-prototype/testData/diagnostics/memberGen/classWithGeneratedMembersAndNestedClass.fir.txt
@@ -14,6 +14,8 @@ FILE: classWithGeneratedMembersAndNestedClass.kt
         public final fun materialize(): R|Foo|
 
         public final class Nested : R|kotlin/Any| {
+            public constructor(): R|Foo.Nested|
+
         }
 
     }
diff --git a/plugins/fir/fir-plugin-prototype/testData/diagnostics/memberGen/generatedClassWithMembersAndNestedClasses.fir.txt b/plugins/fir/fir-plugin-prototype/testData/diagnostics/memberGen/generatedClassWithMembersAndNestedClasses.fir.txt
index 39cda0f2c06..4c1dca0ee5a 100644
--- a/plugins/fir/fir-plugin-prototype/testData/diagnostics/memberGen/generatedClassWithMembersAndNestedClasses.fir.txt
+++ b/plugins/fir/fir-plugin-prototype/testData/diagnostics/memberGen/generatedClassWithMembersAndNestedClasses.fir.txt
@@ -28,18 +28,24 @@ FILE: generatedClassWithMembersAndNestedClasses.kt
         lval nestedBar: R|foo/AllOpenGenerated.NestedBar| = Q|foo/AllOpenGenerated|.R|foo/AllOpenGenerated.NestedBar|()
         R|<local>/nestedBar|.R|foo/AllOpenGenerated.NestedBar.materialize|().R|bar/Bar.bar|()
     }
-FILE: ### GENERATED DECLARATIONS ###
+FILE: __GENERATED DECLARATIONS__.kt
     package foo
 
     public final class AllOpenGenerated : R|kotlin/Any| {
+        public constructor(): R|foo/AllOpenGenerated|
+
         public final class NestedFoo : R|kotlin/Any| {
             public final fun materialize(): R|bar/Foo|
 
+            public constructor(): R|foo/AllOpenGenerated.NestedFoo|
+
         }
 
         public final class NestedBar : R|kotlin/Any| {
             public final fun materialize(): R|bar/Bar|
 
+            public constructor(): R|foo/AllOpenGenerated.NestedBar|
+
         }
 
     }
diff --git a/plugins/fir/fir-plugin-prototype/testData/diagnostics/memberGen/topLevelCallables.fir.txt b/plugins/fir/fir-plugin-prototype/testData/diagnostics/memberGen/topLevelCallables.fir.txt
index b3cddfe51ba..e4cc92bf4ec 100644
--- a/plugins/fir/fir-plugin-prototype/testData/diagnostics/memberGen/topLevelCallables.fir.txt
+++ b/plugins/fir/fir-plugin-prototype/testData/diagnostics/memberGen/topLevelCallables.fir.txt
@@ -14,7 +14,7 @@ FILE: topLevelCallables.kt
     }
     public final fun takeString(s: R|kotlin/String|): R|kotlin/Unit| {
     }
-FILE: ### GENERATED DECLARATIONS ###
+FILE: __GENERATED DECLARATIONS__.kt
     package foo
 
     public final fun dummyMySuperClass(value: R|foo/MySuperClass|): R|kotlin/String|
diff --git a/plugins/fir/fir-plugin-prototype/testData/fir2ir/memberGen/generatedClassWithMembersAndNestedClasses.fir.ir.txt b/plugins/fir/fir-plugin-prototype/testData/fir2ir/memberGen/generatedClassWithMembersAndNestedClasses.fir.ir.txt
index ea848a62563..e6ac8079e59 100644
--- a/plugins/fir/fir-plugin-prototype/testData/fir2ir/memberGen/generatedClassWithMembersAndNestedClasses.fir.ir.txt
+++ b/plugins/fir/fir-plugin-prototype/testData/fir2ir/memberGen/generatedClassWithMembersAndNestedClasses.fir.ir.txt
@@ -67,11 +67,20 @@ FILE fqName:foo fileName:__GENERATED DECLARATIONS__.kt
   CLASS GENERATED[AllOpenClassGeneratorKey] CLASS name:AllOpenGenerated modality:FINAL visibility:public superTypes:[kotlin.Any]
     $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:foo.AllOpenGenerated
     CONSTRUCTOR GENERATED[AllOpenClassGeneratorKey] visibility:public <> () returnType:foo.AllOpenGenerated [primary]
+      BLOCK_BODY
+        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
+        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS GENERATED[AllOpenClassGeneratorKey] CLASS name:AllOpenGenerated modality:FINAL visibility:public superTypes:[kotlin.Any]'
     CLASS GENERATED[AllOpenClassGeneratorKey] CLASS name:NestedFoo modality:FINAL visibility:public superTypes:[kotlin.Any]
       $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:foo.AllOpenGenerated.NestedFoo
       CONSTRUCTOR GENERATED[AllOpenClassGeneratorKey] visibility:public <> () returnType:foo.AllOpenGenerated.NestedFoo [primary]
+        BLOCK_BODY
+          DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
+          INSTANCE_INITIALIZER_CALL classDescriptor='CLASS GENERATED[AllOpenClassGeneratorKey] CLASS name:NestedFoo modality:FINAL visibility:public superTypes:[kotlin.Any]'
       FUN GENERATED[AllOpenClassGeneratorKey] name:materialize visibility:public modality:FINAL <> ($this:foo.AllOpenGenerated.NestedFoo) returnType:bar.Foo
         $this: VALUE_PARAMETER name:<this> type:foo.AllOpenGenerated.NestedFoo
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='public final fun materialize (): bar.Foo declared in foo.AllOpenGenerated.NestedFoo'
+            CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in bar.Foo' type=bar.Foo origin=null
       FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
         overridden:
           public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in kotlin.Any
@@ -88,8 +97,14 @@ FILE fqName:foo fileName:__GENERATED DECLARATIONS__.kt
     CLASS GENERATED[AllOpenClassGeneratorKey] CLASS name:NestedBar modality:FINAL visibility:public superTypes:[kotlin.Any]
       $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:foo.AllOpenGenerated.NestedBar
       CONSTRUCTOR GENERATED[AllOpenClassGeneratorKey] visibility:public <> () returnType:foo.AllOpenGenerated.NestedBar [primary]
+        BLOCK_BODY
+          DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
+          INSTANCE_INITIALIZER_CALL classDescriptor='CLASS GENERATED[AllOpenClassGeneratorKey] CLASS name:NestedBar modality:FINAL visibility:public superTypes:[kotlin.Any]'
       FUN GENERATED[AllOpenClassGeneratorKey] name:materialize visibility:public modality:FINAL <> ($this:foo.AllOpenGenerated.NestedBar) returnType:bar.Bar
         $this: VALUE_PARAMETER name:<this> type:foo.AllOpenGenerated.NestedBar
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='public final fun materialize (): bar.Bar declared in foo.AllOpenGenerated.NestedBar'
+            CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in bar.Bar' type=bar.Bar origin=null
       FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
         overridden:
           public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in kotlin.Any