[FIR] add support for implementation by delgation

This commit handles "subclass: super-interface by delegate-expression".

During Psi2Fir, for each delegate, we add to the subclass a synthetic
field (which has type super-interface), and an assignment of the
delegate-expression to the synthetic field in the primary constructor,
so that the delegate-expression can be resolved and transformed along
the way.

During Fir2Ir, we look up delegatable members from the super-interface
and generate corresponding functions/properties for the subclass.

TODO: support for generic delegatable members and generic
super-interface.

compiler/testData/codegen/box/bridges/delegation.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 interface A<T> {
     fun foo(): T
 }

compiler/testData/codegen/box/bridges/delegationProperty.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 interface A<T> {
     var result: T
 }

compiler/testData/codegen/box/bridges/fakeGenericCovariantOverrideWithDelegation.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 interface A<T> {
     fun foo(t: T): String
 }

compiler/testData/codegen/box/classes/delegation2.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 interface Trait1 {
     fun foo() : String
 }

compiler/testData/codegen/box/classes/inheritance.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // Changed when traits were introduced. May not make sense any more
 
 open class X(val x : Int) {}

compiler/testData/codegen/box/classes/kt2224.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 interface A {
     fun foo(): Int
 }

compiler/testData/codegen/box/classes/kt285.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 interface Trait {
     fun foo() = "O"
     fun bar(): String

compiler/testData/codegen/box/classes/kt3001.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 interface A {
     val result: String
 }

compiler/testData/codegen/box/classes/kt3414.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 interface A {
     fun foo(): Int
 }

compiler/testData/codegen/box/closures/kt11634_3.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 interface A {
     fun foo(): String
 }

compiler/testData/codegen/box/closures/kt11634_4.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 interface A {
     fun foo(): String
 }

compiler/testData/codegen/box/coroutines/delegatedSuspendMember.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // WITH_RUNTIME
 // WITH_COROUTINES
 // COMMON_COROUTINES_TEST

compiler/testData/codegen/box/coroutines/inlineClasses/interfaceDelegateWithInlineClass.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // WITH_RUNTIME
 // WITH_COROUTINES
 // COMMON_COROUTINES_TEST

compiler/testData/codegen/box/coroutines/tailCallOptimizations/interfaceDelegation.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // TARGET_BACKEND: JVM
 // FULL_JDK
 // WITH_RUNTIME

compiler/testData/codegen/box/coroutines/tailCallToNothing.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // WITH_RUNTIME
 // WITH_COROUTINES
 import helpers.*

compiler/testData/codegen/box/coroutines/unitTypeReturn/interfaceDelegation.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // WITH_RUNTIME
 // WITH_COROUTINES
 

compiler/testData/codegen/box/delegation/defaultOverride.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // SKIP_JDK6
 // TARGET_BACKEND: JVM
 

compiler/testData/codegen/box/delegation/hiddenSuperOverrideIn1.0.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 public interface Base {
     fun test() = "base fail"
 }

compiler/testData/codegen/box/delegation/kt8154.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 interface A<T> {
     fun foo(): T
 }

compiler/testData/codegen/box/delegation/mixed.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // SKIP_JDK6
 // TARGET_BACKEND: JVM
 // FILE: Base.java

compiler/testData/codegen/box/enum/enumEntryReferenceFromInnerClassConstructor3.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 interface IFoo {
     fun foo(): String
 }

compiler/testData/codegen/box/inlineClasses/interfaceDelegation/interfaceImplementationByDelegation.kt

@@ -1,5 +1,4 @@
 // !LANGUAGE: +InlineClasses
-// IGNORE_BACKEND_FIR: JVM_IR
 
 interface IFoo {
     fun getO(): String

compiler/testData/codegen/box/inlineClasses/interfaceDelegation/memberFunDelegatedToInlineClassInt.kt

@@ -1,6 +1,5 @@
 // KJS_WITH_FULL_RUNTIME
 // WITH_RUNTIME
-// IGNORE_BACKEND_FIR: JVM_IR
 import kotlin.test.assertEquals
 
 interface IFoo {

compiler/testData/codegen/box/inlineClasses/interfaceDelegation/memberFunDelegatedToInlineClassLong.kt

@@ -1,6 +1,5 @@
 // KJS_WITH_FULL_RUNTIME
 // WITH_RUNTIME
-// IGNORE_BACKEND_FIR: JVM_IR
 import kotlin.test.assertEquals
 
 interface IFoo {

compiler/testData/codegen/box/properties/kt2655.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 interface TextField {
     fun getText(): String
     fun setText(text: String)

compiler/testData/codegen/box/properties/kt2786.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 interface FooTrait {
         val propertyTest: String
 }

compiler/testData/codegen/box/secondaryConstructors/delegationWithPrimary.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 internal interface A {
     fun foo(): String
 }

compiler/testData/codegen/box/strings/kt3571.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 class Thing(delegate: CharSequence) : CharSequence by delegate
   
 fun box(): String {

compiler/testData/codegen/box/throws/delegationAndThrows.kt

@@ -1,6 +1,5 @@
 // !LANGUAGE: +DoNotGenerateThrowsForDelegatedKotlinMembers
 // TARGET_BACKEND: JVM
-// IGNORE_BACKEND_FIR: JVM_IR
 // WITH_RUNTIME
 // FILE: A.kt
 

compiler/testData/codegen/box/toArray/toArray.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // TARGET_BACKEND: JVM
 
 // WITH_RUNTIME

compiler/testData/codegen/box/toArray/toArrayFromJava.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // TARGET_BACKEND: JVM
 // The old backend thinks `toArray(): Array<Int?>` is the same as `toArray(): Array<Any?>`
 // IGNORE_BACKEND: JVM

compiler/testData/diagnostics/tests/annotations/annotationInheritance.fir.kt

@@ -4,5 +4,5 @@ interface T
 
 annotation class Ann: C()
 annotation class Ann2: T
-annotation class Ann3: T by a
+annotation class Ann3: T by <!ANNOTATION_CLASS_MEMBER!>a<!>
 annotation class Ann4: C(), T

compiler/testData/diagnostics/tests/override/MissingDelegate.fir.kt

@@ -1,3 +1,3 @@
-class C : Base1 by Base2(1) {
+class C : Base1 by <!UNRESOLVED_REFERENCE!>Base2<!>(1) {
   fun test() { }
 }

compiler/testData/ir/irText/classes/delegatedGenericImplementation.fir.txt

@@ -46,34 +46,59 @@ FILE fqName:<root> fileName:/delegatedGenericImplementation.kt
       BLOCK_BODY
         DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
         INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:Test1 modality:FINAL visibility:public superTypes:[<root>.IBase<E of <root>.Test1>]'
-    FUN FAKE_OVERRIDE name:foo visibility:public modality:ABSTRACT <B> ($this:<root>.IBase<A of <root>.IBase>, a:E of <root>.Test1, b:B of <root>.Test1.foo) returnType:kotlin.Unit [fake_override]
+        SET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IBase<E of <root>.Test1> visibility:local [final]' type=kotlin.Unit origin=EQ
+          receiver: GET_VAR '<this>: <root>.Test1<E of <root>.Test1> declared in <root>.Test1' type=<root>.Test1<E of <root>.Test1> origin=null
+          value: GET_VAR 'i: <root>.IBase<E of <root>.Test1> declared in <root>.Test1.<init>' type=<root>.IBase<E of <root>.Test1> origin=null
+    FUN DELEGATED_MEMBER name:foo visibility:public modality:OPEN <> ($this:<root>.Test1<E of <root>.Test1>, a:A of <root>.IBase, b:B of <root>.IBase.foo) returnType:kotlin.Unit
       overridden:
         public abstract fun foo <B> (a: A of <root>.IBase, b: B of <root>.IBase.foo): kotlin.Unit declared in <root>.IBase
-      TYPE_PARAMETER name:B index:0 variance: superTypes:[kotlin.Any?]
-      $this: VALUE_PARAMETER name:<this> type:<root>.IBase<A of <root>.IBase>
-      VALUE_PARAMETER name:a index:0 type:E of <root>.Test1
-      VALUE_PARAMETER name:b index:1 type:B of <root>.Test1.foo
-    PROPERTY FAKE_OVERRIDE name:id visibility:public modality:ABSTRACT [fake_override,val]
-      FUN FAKE_OVERRIDE name:<get-id> visibility:public modality:ABSTRACT <C> ($this:<root>.IBase<A of <root>.IBase>) returnType:kotlin.collections.Map<E of <root>.Test1, C of <root>.Test1.<get-id>>? [fake_override]
-        correspondingProperty: PROPERTY FAKE_OVERRIDE name:id visibility:public modality:ABSTRACT [fake_override,val]
+      $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test1<E of <root>.Test1>
+      VALUE_PARAMETER DELEGATED_MEMBER name:a index:0 type:A of <root>.IBase
+      VALUE_PARAMETER DELEGATED_MEMBER name:b index:1 type:B of <root>.IBase.foo
+      BLOCK_BODY
+        CALL 'public abstract fun foo <B> (a: A of <root>.IBase, b: B of <root>.IBase.foo): kotlin.Unit declared in <root>.IBase' type=kotlin.Unit origin=null
+          <B>: <none>
+          $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IBase<E of <root>.Test1> visibility:local [final]' type=<root>.IBase<E of <root>.Test1> origin=null
+            receiver: GET_VAR '<this>: <root>.Test1<E of <root>.Test1> declared in <root>.Test1.foo' type=<root>.Test1<E of <root>.Test1> origin=null
+          a: GET_VAR 'a: A of <root>.IBase declared in <root>.Test1.foo' type=A of <root>.IBase origin=null
+          b: GET_VAR 'b: B of <root>.IBase.foo declared in <root>.Test1.foo' type=B of <root>.IBase.foo origin=null
+    PROPERTY DELEGATED_MEMBER name:id visibility:public modality:OPEN [val]
+      FUN DELEGATED_MEMBER name:<get-id> visibility:public modality:OPEN <> ($this:<root>.Test1<E of <root>.Test1>) returnType:kotlin.collections.Map<A of <root>.IBase, C of <root>.IBase.<get-id>>?
+        correspondingProperty: PROPERTY DELEGATED_MEMBER name:id visibility:public modality:OPEN [val]
         overridden:
           public abstract fun <get-id> <C> (): kotlin.collections.Map<A of <root>.IBase, C of <root>.IBase.<get-id>>? declared in <root>.IBase
-        TYPE_PARAMETER name:C index:0 variance: superTypes:[kotlin.Any?]
-        $this: VALUE_PARAMETER name:<this> type:<root>.IBase<A of <root>.IBase>
-    PROPERTY FAKE_OVERRIDE name:x visibility:public modality:ABSTRACT [fake_override,var]
-      FUN FAKE_OVERRIDE name:<get-x> visibility:public modality:ABSTRACT <D> ($this:<root>.IBase<A of <root>.IBase>) returnType:D of <root>.Test1.<get-x>? [fake_override]
-        correspondingProperty: PROPERTY FAKE_OVERRIDE name:x visibility:public modality:ABSTRACT [fake_override,var]
+        $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test1<E of <root>.Test1>
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='public open fun <get-id> (): kotlin.collections.Map<A of <root>.IBase, C of <root>.IBase.<get-id>>? declared in <root>.Test1'
+            CALL 'public abstract fun <get-id> <C> (): kotlin.collections.Map<A of <root>.IBase, C of <root>.IBase.<get-id>>? declared in <root>.IBase' type=kotlin.collections.Map<A of <root>.IBase, C of <root>.IBase.<get-id>>? origin=null
+              <C>: <none>
+              $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IBase<E of <root>.Test1> visibility:local [final]' type=<root>.IBase<E of <root>.Test1> origin=null
+                receiver: GET_VAR '<this>: <root>.Test1<E of <root>.Test1> declared in <root>.Test1.<get-id>' type=<root>.Test1<E of <root>.Test1> origin=null
+    PROPERTY DELEGATED_MEMBER name:x visibility:public modality:OPEN [var]
+      FUN DELEGATED_MEMBER name:<get-x> visibility:public modality:OPEN <> ($this:<root>.Test1<E of <root>.Test1>) returnType:D of <root>.IBase.<get-x>?
+        correspondingProperty: PROPERTY DELEGATED_MEMBER name:x visibility:public modality:OPEN [var]
         overridden:
           public abstract fun <get-x> <D> (): D of <root>.IBase.<get-x>? declared in <root>.IBase
-        TYPE_PARAMETER name:D index:0 variance: superTypes:[kotlin.Any?]
-        $this: VALUE_PARAMETER name:<this> type:<root>.IBase<A of <root>.IBase>
-      FUN FAKE_OVERRIDE name:<set-x> visibility:public modality:ABSTRACT <D> ($this:<root>.IBase<A of <root>.IBase>, <set-?>:D of <root>.Test1.<set-x>?) returnType:kotlin.Unit [fake_override]
-        correspondingProperty: PROPERTY FAKE_OVERRIDE name:x visibility:public modality:ABSTRACT [fake_override,var]
+        $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test1<E of <root>.Test1>
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='public open fun <get-x> (): D of <root>.IBase.<get-x>? declared in <root>.Test1'
+            CALL 'public abstract fun <get-x> <D> (): D of <root>.IBase.<get-x>? declared in <root>.IBase' type=D of <root>.IBase.<get-x>? origin=null
+              <D>: <none>
+              $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IBase<E of <root>.Test1> visibility:local [final]' type=<root>.IBase<E of <root>.Test1> origin=null
+                receiver: GET_VAR '<this>: <root>.Test1<E of <root>.Test1> declared in <root>.Test1.<get-x>' type=<root>.Test1<E of <root>.Test1> origin=null
+      FUN DELEGATED_MEMBER name:<set-x> visibility:public modality:OPEN <> ($this:<root>.Test1<E of <root>.Test1>, <set-?>:D of <root>.IBase.<set-x>?) returnType:kotlin.Unit
+        correspondingProperty: PROPERTY DELEGATED_MEMBER name:x visibility:public modality:OPEN [var]
         overridden:
           public abstract fun <set-x> <D> (<set-?>: D of <root>.IBase.<set-x>?): kotlin.Unit declared in <root>.IBase
-        TYPE_PARAMETER name:D index:0 variance: superTypes:[kotlin.Any?]
-        $this: VALUE_PARAMETER name:<this> type:<root>.IBase<A of <root>.IBase>
-        VALUE_PARAMETER name:<set-?> index:0 type:D of <root>.Test1.<set-x>?
+        $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test1<E of <root>.Test1>
+        VALUE_PARAMETER DELEGATED_MEMBER name:<set-?> index:0 type:D of <root>.IBase.<set-x>?
+        BLOCK_BODY
+          CALL 'public abstract fun <set-x> <D> (<set-?>: D of <root>.IBase.<set-x>?): kotlin.Unit declared in <root>.IBase' type=kotlin.Unit origin=null
+            <D>: <none>
+            $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IBase<E of <root>.Test1> visibility:local [final]' type=<root>.IBase<E of <root>.Test1> origin=null
+              receiver: GET_VAR '<this>: <root>.Test1<E of <root>.Test1> declared in <root>.Test1.<set-x>' type=<root>.Test1<E of <root>.Test1> origin=null
+            <set-?>: GET_VAR '<set-?>: D of <root>.IBase.<set-x>? declared in <root>.Test1.<set-x>' type=D of <root>.IBase.<set-x>? origin=null
+    FIELD DELEGATE name:$$delegate_0 type:<root>.IBase<E of <root>.Test1> visibility:local [final]
     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
@@ -94,6 +119,9 @@ FILE fqName:<root> fileName:/delegatedGenericImplementation.kt
       BLOCK_BODY
         DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
         INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:Test2 modality:FINAL visibility:public superTypes:[<root>.IBase<kotlin.String>]'
+        SET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IBase<kotlin.String> visibility:local [final]' type=kotlin.Unit origin=EQ
+          receiver: GET_VAR '<this>: <root>.Test2 declared in <root>.Test2' type=<root>.Test2 origin=null
+          value: GET_VAR 'j: <root>.IBase<kotlin.String> declared in <root>.Test2.<init>' type=<root>.IBase<kotlin.String> origin=null
     PROPERTY name:j visibility:public modality:FINAL [var]
       FIELD PROPERTY_BACKING_FIELD name:j type:<root>.IBase<kotlin.String> visibility:private
         EXPRESSION_BODY
@@ -113,34 +141,56 @@ FILE fqName:<root> fileName:/delegatedGenericImplementation.kt
           SET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:j type:<root>.IBase<kotlin.String> visibility:private' type=kotlin.Unit origin=null
             receiver: GET_VAR '<this>: <root>.Test2 declared in <root>.Test2.<set-j>' type=<root>.Test2 origin=null
             value: GET_VAR '<set-?>: <root>.IBase<kotlin.String> declared in <root>.Test2.<set-j>' type=<root>.IBase<kotlin.String> origin=null
-    FUN FAKE_OVERRIDE name:foo visibility:public modality:ABSTRACT <B> ($this:<root>.IBase<A of <root>.IBase>, a:kotlin.String, b:B of <root>.Test2.foo) returnType:kotlin.Unit [fake_override]
+    FUN DELEGATED_MEMBER name:foo visibility:public modality:OPEN <> ($this:<root>.Test2, a:A of <root>.IBase, b:B of <root>.IBase.foo) returnType:kotlin.Unit
       overridden:
         public abstract fun foo <B> (a: A of <root>.IBase, b: B of <root>.IBase.foo): kotlin.Unit declared in <root>.IBase
-      TYPE_PARAMETER name:B index:0 variance: superTypes:[kotlin.Any?]
-      $this: VALUE_PARAMETER name:<this> type:<root>.IBase<A of <root>.IBase>
-      VALUE_PARAMETER name:a index:0 type:kotlin.String
-      VALUE_PARAMETER name:b index:1 type:B of <root>.Test2.foo
-    PROPERTY FAKE_OVERRIDE name:id visibility:public modality:ABSTRACT [fake_override,val]
-      FUN FAKE_OVERRIDE name:<get-id> visibility:public modality:ABSTRACT <C> ($this:<root>.IBase<A of <root>.IBase>) returnType:kotlin.collections.Map<kotlin.String, C of <root>.Test2.<get-id>>? [fake_override]
-        correspondingProperty: PROPERTY FAKE_OVERRIDE name:id visibility:public modality:ABSTRACT [fake_override,val]
+      $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test2
+      VALUE_PARAMETER DELEGATED_MEMBER name:a index:0 type:A of <root>.IBase
+      VALUE_PARAMETER DELEGATED_MEMBER name:b index:1 type:B of <root>.IBase.foo
+      BLOCK_BODY
+        CALL 'public abstract fun foo <B> (a: A of <root>.IBase, b: B of <root>.IBase.foo): kotlin.Unit declared in <root>.IBase' type=kotlin.Unit origin=null
+          <B>: <none>
+          $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IBase<kotlin.String> visibility:local [final]' type=<root>.IBase<kotlin.String> origin=null
+            receiver: GET_VAR '<this>: <root>.Test2 declared in <root>.Test2.foo' type=<root>.Test2 origin=null
+          a: GET_VAR 'a: A of <root>.IBase declared in <root>.Test2.foo' type=A of <root>.IBase origin=null
+          b: GET_VAR 'b: B of <root>.IBase.foo declared in <root>.Test2.foo' type=B of <root>.IBase.foo origin=null
+    PROPERTY DELEGATED_MEMBER name:id visibility:public modality:OPEN [val]
+      FUN DELEGATED_MEMBER name:<get-id> visibility:public modality:OPEN <> ($this:<root>.Test2) returnType:kotlin.collections.Map<A of <root>.IBase, C of <root>.IBase.<get-id>>?
+        correspondingProperty: PROPERTY DELEGATED_MEMBER name:id visibility:public modality:OPEN [val]
         overridden:
           public abstract fun <get-id> <C> (): kotlin.collections.Map<A of <root>.IBase, C of <root>.IBase.<get-id>>? declared in <root>.IBase
-        TYPE_PARAMETER name:C index:0 variance: superTypes:[kotlin.Any?]
-        $this: VALUE_PARAMETER name:<this> type:<root>.IBase<A of <root>.IBase>
-    PROPERTY FAKE_OVERRIDE name:x visibility:public modality:ABSTRACT [fake_override,var]
-      FUN FAKE_OVERRIDE name:<get-x> visibility:public modality:ABSTRACT <D> ($this:<root>.IBase<A of <root>.IBase>) returnType:D of <root>.Test2.<get-x>? [fake_override]
-        correspondingProperty: PROPERTY FAKE_OVERRIDE name:x visibility:public modality:ABSTRACT [fake_override,var]
+        $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test2
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='public open fun <get-id> (): kotlin.collections.Map<A of <root>.IBase, C of <root>.IBase.<get-id>>? declared in <root>.Test2'
+            CALL 'public abstract fun <get-id> <C> (): kotlin.collections.Map<A of <root>.IBase, C of <root>.IBase.<get-id>>? declared in <root>.IBase' type=kotlin.collections.Map<A of <root>.IBase, C of <root>.IBase.<get-id>>? origin=null
+              <C>: <none>
+              $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IBase<kotlin.String> visibility:local [final]' type=<root>.IBase<kotlin.String> origin=null
+                receiver: GET_VAR '<this>: <root>.Test2 declared in <root>.Test2.<get-id>' type=<root>.Test2 origin=null
+    PROPERTY DELEGATED_MEMBER name:x visibility:public modality:OPEN [var]
+      FUN DELEGATED_MEMBER name:<get-x> visibility:public modality:OPEN <> ($this:<root>.Test2) returnType:D of <root>.IBase.<get-x>?
+        correspondingProperty: PROPERTY DELEGATED_MEMBER name:x visibility:public modality:OPEN [var]
         overridden:
           public abstract fun <get-x> <D> (): D of <root>.IBase.<get-x>? declared in <root>.IBase
-        TYPE_PARAMETER name:D index:0 variance: superTypes:[kotlin.Any?]
-        $this: VALUE_PARAMETER name:<this> type:<root>.IBase<A of <root>.IBase>
-      FUN FAKE_OVERRIDE name:<set-x> visibility:public modality:ABSTRACT <D> ($this:<root>.IBase<A of <root>.IBase>, <set-?>:D of <root>.Test2.<set-x>?) returnType:kotlin.Unit [fake_override]
-        correspondingProperty: PROPERTY FAKE_OVERRIDE name:x visibility:public modality:ABSTRACT [fake_override,var]
+        $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test2
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='public open fun <get-x> (): D of <root>.IBase.<get-x>? declared in <root>.Test2'
+            CALL 'public abstract fun <get-x> <D> (): D of <root>.IBase.<get-x>? declared in <root>.IBase' type=D of <root>.IBase.<get-x>? origin=null
+              <D>: <none>
+              $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IBase<kotlin.String> visibility:local [final]' type=<root>.IBase<kotlin.String> origin=null
+                receiver: GET_VAR '<this>: <root>.Test2 declared in <root>.Test2.<get-x>' type=<root>.Test2 origin=null
+      FUN DELEGATED_MEMBER name:<set-x> visibility:public modality:OPEN <> ($this:<root>.Test2, <set-?>:D of <root>.IBase.<set-x>?) returnType:kotlin.Unit
+        correspondingProperty: PROPERTY DELEGATED_MEMBER name:x visibility:public modality:OPEN [var]
         overridden:
           public abstract fun <set-x> <D> (<set-?>: D of <root>.IBase.<set-x>?): kotlin.Unit declared in <root>.IBase
-        TYPE_PARAMETER name:D index:0 variance: superTypes:[kotlin.Any?]
-        $this: VALUE_PARAMETER name:<this> type:<root>.IBase<A of <root>.IBase>
-        VALUE_PARAMETER name:<set-?> index:0 type:D of <root>.Test2.<set-x>?
+        $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test2
+        VALUE_PARAMETER DELEGATED_MEMBER name:<set-?> index:0 type:D of <root>.IBase.<set-x>?
+        BLOCK_BODY
+          CALL 'public abstract fun <set-x> <D> (<set-?>: D of <root>.IBase.<set-x>?): kotlin.Unit declared in <root>.IBase' type=kotlin.Unit origin=null
+            <D>: <none>
+            $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IBase<kotlin.String> visibility:local [final]' type=<root>.IBase<kotlin.String> origin=null
+              receiver: GET_VAR '<this>: <root>.Test2 declared in <root>.Test2.<set-x>' type=<root>.Test2 origin=null
+            <set-?>: GET_VAR '<set-?>: D of <root>.IBase.<set-x>? declared in <root>.Test2.<set-x>' type=D of <root>.IBase.<set-x>? origin=null
+    FIELD DELEGATE name:$$delegate_0 type:<root>.IBase<kotlin.String> visibility:local [final]
     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

compiler/testData/ir/irText/classes/delegatedImplementation.fir.txt

@@ -200,21 +200,39 @@ FILE fqName:<root> fileName:/delegatedImplementation.kt
       BLOCK_BODY
         DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
         INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:Test1 modality:FINAL visibility:public superTypes:[<root>.IBase]'
-    FUN FAKE_OVERRIDE name:foo visibility:public modality:ABSTRACT <> ($this:<root>.IBase, x:kotlin.Int, s:kotlin.String) returnType:kotlin.Unit [fake_override]
+        SET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IBase visibility:local [final]' type=kotlin.Unit origin=EQ
+          receiver: GET_VAR '<this>: <root>.Test1 declared in <root>.Test1' type=<root>.Test1 origin=null
+          value: GET_OBJECT 'CLASS OBJECT name:BaseImpl modality:FINAL visibility:public superTypes:[<root>.IBase]' type=<root>.BaseImpl
+    FUN DELEGATED_MEMBER name:foo visibility:public modality:OPEN <> ($this:<root>.Test1, x:kotlin.Int, s:kotlin.String) returnType:kotlin.Unit
       overridden:
         public abstract fun foo (x: kotlin.Int, s: kotlin.String): kotlin.Unit declared in <root>.IBase
-      $this: VALUE_PARAMETER name:<this> type:<root>.IBase
-      VALUE_PARAMETER name:x index:0 type:kotlin.Int
-      VALUE_PARAMETER name:s index:1 type:kotlin.String
-    FUN FAKE_OVERRIDE name:bar visibility:public modality:ABSTRACT <> ($this:<root>.IBase) returnType:kotlin.Int [fake_override]
+      $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test1
+      VALUE_PARAMETER DELEGATED_MEMBER name:x index:0 type:kotlin.Int
+      VALUE_PARAMETER DELEGATED_MEMBER name:s index:1 type:kotlin.String
+      BLOCK_BODY
+        CALL 'public abstract fun foo (x: kotlin.Int, s: kotlin.String): kotlin.Unit declared in <root>.IBase' type=kotlin.Unit origin=null
+          $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IBase visibility:local [final]' type=<root>.IBase origin=null
+            receiver: GET_VAR '<this>: <root>.Test1 declared in <root>.Test1.foo' type=<root>.Test1 origin=null
+          x: GET_VAR 'x: kotlin.Int declared in <root>.Test1.foo' type=kotlin.Int origin=null
+          s: GET_VAR 's: kotlin.String declared in <root>.Test1.foo' type=kotlin.String origin=null
+    FUN DELEGATED_MEMBER name:bar visibility:public modality:OPEN <> ($this:<root>.Test1) returnType:kotlin.Int
       overridden:
         public abstract fun bar (): kotlin.Int declared in <root>.IBase
-      $this: VALUE_PARAMETER name:<this> type:<root>.IBase
-    FUN FAKE_OVERRIDE name:qux visibility:public modality:ABSTRACT <> ($this:<root>.IBase, $receiver:kotlin.String) returnType:kotlin.Unit [fake_override]
+      $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test1
+      BLOCK_BODY
+        RETURN type=kotlin.Nothing from='public open fun bar (): kotlin.Int declared in <root>.Test1'
+          CALL 'public abstract fun bar (): kotlin.Int declared in <root>.IBase' type=kotlin.Int origin=null
+            $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IBase visibility:local [final]' type=<root>.IBase origin=null
+              receiver: GET_VAR '<this>: <root>.Test1 declared in <root>.Test1.bar' type=<root>.Test1 origin=null
+    FUN DELEGATED_MEMBER name:qux visibility:public modality:OPEN <> ($this:<root>.Test1) returnType:kotlin.Unit
       overridden:
         public abstract fun qux (): kotlin.Unit declared in <root>.IBase
-      $this: VALUE_PARAMETER name:<this> type:<root>.IBase
-      $receiver: VALUE_PARAMETER name:<this> type:kotlin.String
+      $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test1
+      BLOCK_BODY
+        CALL 'public abstract fun qux (): kotlin.Unit declared in <root>.IBase' type=kotlin.Unit origin=null
+          $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IBase visibility:local [final]' type=<root>.IBase origin=null
+            receiver: GET_VAR '<this>: <root>.Test1 declared in <root>.Test1.qux' type=<root>.Test1 origin=null
+    FIELD DELEGATE name:$$delegate_0 type:<root>.IBase visibility:local [final]
     FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
       overridden:
         public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in kotlin.Any
@@ -234,21 +252,111 @@ FILE fqName:<root> fileName:/delegatedImplementation.kt
       BLOCK_BODY
         DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
         INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:Test2 modality:FINAL visibility:public superTypes:[<root>.IBase; <root>.IOther]'
-    FUN FAKE_OVERRIDE name:foo visibility:public modality:ABSTRACT <> ($this:<root>.IBase, x:kotlin.Int, s:kotlin.String) returnType:kotlin.Unit [fake_override]
+        SET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IBase visibility:local [final]' type=kotlin.Unit origin=EQ
+          receiver: GET_VAR '<this>: <root>.Test2 declared in <root>.Test2' type=<root>.Test2 origin=null
+          value: GET_OBJECT 'CLASS OBJECT name:BaseImpl modality:FINAL visibility:public superTypes:[<root>.IBase]' type=<root>.BaseImpl
+        SET_FIELD 'FIELD DELEGATE name:$$delegate_1 type:<root>.IOther visibility:local [final]' type=kotlin.Unit origin=EQ
+          receiver: GET_VAR '<this>: <root>.Test2 declared in <root>.Test2' type=<root>.Test2 origin=null
+          value: CALL 'public final fun otherImpl (x0: kotlin.String, y0: kotlin.Int): <root>.IOther declared in <root>' type=<root>.IOther origin=null
+            x0: CONST String type=kotlin.String value=""
+            y0: CONST Int type=kotlin.Int value=42
+    FUN DELEGATED_MEMBER name:foo visibility:public modality:OPEN <> ($this:<root>.Test2, x:kotlin.Int, s:kotlin.String) returnType:kotlin.Unit
       overridden:
         public abstract fun foo (x: kotlin.Int, s: kotlin.String): kotlin.Unit declared in <root>.IBase
-      $this: VALUE_PARAMETER name:<this> type:<root>.IBase
-      VALUE_PARAMETER name:x index:0 type:kotlin.Int
-      VALUE_PARAMETER name:s index:1 type:kotlin.String
-    FUN FAKE_OVERRIDE name:bar visibility:public modality:ABSTRACT <> ($this:<root>.IBase) returnType:kotlin.Int [fake_override]
+      $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test2
+      VALUE_PARAMETER DELEGATED_MEMBER name:x index:0 type:kotlin.Int
+      VALUE_PARAMETER DELEGATED_MEMBER name:s index:1 type:kotlin.String
+      BLOCK_BODY
+        CALL 'public abstract fun foo (x: kotlin.Int, s: kotlin.String): kotlin.Unit declared in <root>.IBase' type=kotlin.Unit origin=null
+          $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IBase visibility:local [final]' type=<root>.IBase origin=null
+            receiver: GET_VAR '<this>: <root>.Test2 declared in <root>.Test2.foo' type=<root>.Test2 origin=null
+          x: GET_VAR 'x: kotlin.Int declared in <root>.Test2.foo' type=kotlin.Int origin=null
+          s: GET_VAR 's: kotlin.String declared in <root>.Test2.foo' type=kotlin.String origin=null
+    FUN DELEGATED_MEMBER name:bar visibility:public modality:OPEN <> ($this:<root>.Test2) returnType:kotlin.Int
       overridden:
         public abstract fun bar (): kotlin.Int declared in <root>.IBase
-      $this: VALUE_PARAMETER name:<this> type:<root>.IBase
-    FUN FAKE_OVERRIDE name:qux visibility:public modality:ABSTRACT <> ($this:<root>.IBase, $receiver:kotlin.String) returnType:kotlin.Unit [fake_override]
+      $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test2
+      BLOCK_BODY
+        RETURN type=kotlin.Nothing from='public open fun bar (): kotlin.Int declared in <root>.Test2'
+          CALL 'public abstract fun bar (): kotlin.Int declared in <root>.IBase' type=kotlin.Int origin=null
+            $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IBase visibility:local [final]' type=<root>.IBase origin=null
+              receiver: GET_VAR '<this>: <root>.Test2 declared in <root>.Test2.bar' type=<root>.Test2 origin=null
+    FUN DELEGATED_MEMBER name:qux visibility:public modality:OPEN <> ($this:<root>.Test2) returnType:kotlin.Unit
       overridden:
         public abstract fun qux (): kotlin.Unit declared in <root>.IBase
-      $this: VALUE_PARAMETER name:<this> type:<root>.IBase
-      $receiver: VALUE_PARAMETER name:<this> type:kotlin.String
+      $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test2
+      BLOCK_BODY
+        CALL 'public abstract fun qux (): kotlin.Unit declared in <root>.IBase' type=kotlin.Unit origin=null
+          $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IBase visibility:local [final]' type=<root>.IBase origin=null
+            receiver: GET_VAR '<this>: <root>.Test2 declared in <root>.Test2.qux' type=<root>.Test2 origin=null
+    FIELD DELEGATE name:$$delegate_0 type:<root>.IBase visibility:local [final]
+    PROPERTY DELEGATED_MEMBER name:x visibility:public modality:OPEN [val]
+      FUN DELEGATED_MEMBER name:<get-x> visibility:public modality:OPEN <> ($this:<root>.Test2) returnType:kotlin.String
+        correspondingProperty: PROPERTY DELEGATED_MEMBER name:x visibility:public modality:OPEN [val]
+        overridden:
+          public abstract fun <get-x> (): kotlin.String declared in <root>.IOther
+        $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test2
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='public open fun <get-x> (): kotlin.String declared in <root>.Test2'
+            CALL 'public abstract fun <get-x> (): kotlin.String declared in <root>.IOther' type=kotlin.String origin=null
+              $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_1 type:<root>.IOther visibility:local [final]' type=<root>.IOther origin=null
+                receiver: GET_VAR '<this>: <root>.Test2 declared in <root>.Test2.<get-x>' type=<root>.Test2 origin=null
+    PROPERTY DELEGATED_MEMBER name:y visibility:public modality:OPEN [var]
+      FUN DELEGATED_MEMBER name:<get-y> visibility:public modality:OPEN <> ($this:<root>.Test2) returnType:kotlin.Int
+        correspondingProperty: PROPERTY DELEGATED_MEMBER name:y visibility:public modality:OPEN [var]
+        overridden:
+          public abstract fun <get-y> (): kotlin.Int declared in <root>.IOther
+        $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test2
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='public open fun <get-y> (): kotlin.Int declared in <root>.Test2'
+            CALL 'public abstract fun <get-y> (): kotlin.Int declared in <root>.IOther' type=kotlin.Int origin=null
+              $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_1 type:<root>.IOther visibility:local [final]' type=<root>.IOther origin=null
+                receiver: GET_VAR '<this>: <root>.Test2 declared in <root>.Test2.<get-y>' type=<root>.Test2 origin=null
+      FUN DELEGATED_MEMBER name:<set-y> visibility:public modality:OPEN <> ($this:<root>.Test2, <set-?>:kotlin.Int) returnType:kotlin.Unit
+        correspondingProperty: PROPERTY DELEGATED_MEMBER name:y visibility:public modality:OPEN [var]
+        overridden:
+          public abstract fun <set-y> (<set-?>: kotlin.Int): kotlin.Unit declared in <root>.IOther
+        $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test2
+        VALUE_PARAMETER DELEGATED_MEMBER name:<set-?> index:0 type:kotlin.Int
+        BLOCK_BODY
+          CALL 'public abstract fun <set-y> (<set-?>: kotlin.Int): kotlin.Unit declared in <root>.IOther' type=kotlin.Unit origin=null
+            $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_1 type:<root>.IOther visibility:local [final]' type=<root>.IOther origin=null
+              receiver: GET_VAR '<this>: <root>.Test2 declared in <root>.Test2.<set-y>' type=<root>.Test2 origin=null
+            <set-?>: GET_VAR '<set-?>: kotlin.Int declared in <root>.Test2.<set-y>' type=kotlin.Int origin=null
+    PROPERTY DELEGATED_MEMBER name:z1 visibility:public modality:OPEN [val]
+      FUN DELEGATED_MEMBER name:<get-z1> visibility:public modality:OPEN <> ($this:<root>.Test2) returnType:kotlin.Int
+        correspondingProperty: PROPERTY DELEGATED_MEMBER name:z1 visibility:public modality:OPEN [val]
+        overridden:
+          public abstract fun <get-z1> (): kotlin.Int declared in <root>.IOther
+        $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test2
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='public open fun <get-z1> (): kotlin.Int declared in <root>.Test2'
+            CALL 'public abstract fun <get-z1> (): kotlin.Int declared in <root>.IOther' type=kotlin.Int origin=null
+              $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_1 type:<root>.IOther visibility:local [final]' type=<root>.IOther origin=null
+                receiver: GET_VAR '<this>: <root>.Test2 declared in <root>.Test2.<get-z1>' type=<root>.Test2 origin=null
+    PROPERTY DELEGATED_MEMBER name:z2 visibility:public modality:OPEN [var]
+      FUN DELEGATED_MEMBER name:<get-z2> visibility:public modality:OPEN <> ($this:<root>.Test2) returnType:kotlin.Int
+        correspondingProperty: PROPERTY DELEGATED_MEMBER name:z2 visibility:public modality:OPEN [var]
+        overridden:
+          public abstract fun <get-z2> (): kotlin.Int declared in <root>.IOther
+        $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test2
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='public open fun <get-z2> (): kotlin.Int declared in <root>.Test2'
+            CALL 'public abstract fun <get-z2> (): kotlin.Int declared in <root>.IOther' type=kotlin.Int origin=null
+              $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_1 type:<root>.IOther visibility:local [final]' type=<root>.IOther origin=null
+                receiver: GET_VAR '<this>: <root>.Test2 declared in <root>.Test2.<get-z2>' type=<root>.Test2 origin=null
+      FUN DELEGATED_MEMBER name:<set-z2> visibility:public modality:OPEN <> ($this:<root>.Test2, <set-?>:kotlin.Int) returnType:kotlin.Unit
+        correspondingProperty: PROPERTY DELEGATED_MEMBER name:z2 visibility:public modality:OPEN [var]
+        overridden:
+          public abstract fun <set-z2> (<set-?>: kotlin.Int): kotlin.Unit declared in <root>.IOther
+        $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test2
+        VALUE_PARAMETER DELEGATED_MEMBER name:<set-?> index:0 type:kotlin.Int
+        BLOCK_BODY
+          CALL 'public abstract fun <set-z2> (<set-?>: kotlin.Int): kotlin.Unit declared in <root>.IOther' type=kotlin.Unit origin=null
+            $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_1 type:<root>.IOther visibility:local [final]' type=<root>.IOther origin=null
+              receiver: GET_VAR '<this>: <root>.Test2 declared in <root>.Test2.<set-z2>' type=<root>.Test2 origin=null
+            <set-?>: GET_VAR '<set-?>: kotlin.Int declared in <root>.Test2.<set-z2>' type=kotlin.Int origin=null
+    FIELD DELEGATE name:$$delegate_1 type:<root>.IOther visibility:local [final]
     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
@@ -262,39 +370,3 @@ FILE fqName:<root> fileName:/delegatedImplementation.kt
       overridden:
         public open fun toString (): kotlin.String declared in kotlin.Any
       $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-    PROPERTY FAKE_OVERRIDE name:x visibility:public modality:ABSTRACT [fake_override,val]
-      FUN FAKE_OVERRIDE name:<get-x> visibility:public modality:ABSTRACT <> ($this:<root>.IOther) returnType:kotlin.String [fake_override]
-        correspondingProperty: PROPERTY FAKE_OVERRIDE name:x visibility:public modality:ABSTRACT [fake_override,val]
-        overridden:
-          public abstract fun <get-x> (): kotlin.String declared in <root>.IOther
-        $this: VALUE_PARAMETER name:<this> type:<root>.IOther
-    PROPERTY FAKE_OVERRIDE name:y visibility:public modality:ABSTRACT [fake_override,var]
-      FUN FAKE_OVERRIDE name:<get-y> visibility:public modality:ABSTRACT <> ($this:<root>.IOther) returnType:kotlin.Int [fake_override]
-        correspondingProperty: PROPERTY FAKE_OVERRIDE name:y visibility:public modality:ABSTRACT [fake_override,var]
-        overridden:
-          public abstract fun <get-y> (): kotlin.Int declared in <root>.IOther
-        $this: VALUE_PARAMETER name:<this> type:<root>.IOther
-      FUN FAKE_OVERRIDE name:<set-y> visibility:public modality:ABSTRACT <> ($this:<root>.IOther, <set-?>:kotlin.Int) returnType:kotlin.Unit [fake_override]
-        correspondingProperty: PROPERTY FAKE_OVERRIDE name:y visibility:public modality:ABSTRACT [fake_override,var]
-        overridden:
-          public abstract fun <set-y> (<set-?>: kotlin.Int): kotlin.Unit declared in <root>.IOther
-        $this: VALUE_PARAMETER name:<this> type:<root>.IOther
-        VALUE_PARAMETER name:<set-?> index:0 type:kotlin.Int
-    PROPERTY FAKE_OVERRIDE name:z1 visibility:public modality:ABSTRACT [fake_override,val]
-      FUN FAKE_OVERRIDE name:<get-z1> visibility:public modality:ABSTRACT <> ($this:<root>.IOther) returnType:kotlin.Int [fake_override]
-        correspondingProperty: PROPERTY FAKE_OVERRIDE name:z1 visibility:public modality:ABSTRACT [fake_override,val]
-        overridden:
-          public abstract fun <get-z1> (): kotlin.Int declared in <root>.IOther
-        $this: VALUE_PARAMETER name:<this> type:<root>.IOther
-    PROPERTY FAKE_OVERRIDE name:z2 visibility:public modality:ABSTRACT [fake_override,var]
-      FUN FAKE_OVERRIDE name:<get-z2> visibility:public modality:ABSTRACT <> ($this:<root>.IOther) returnType:kotlin.Int [fake_override]
-        correspondingProperty: PROPERTY FAKE_OVERRIDE name:z2 visibility:public modality:ABSTRACT [fake_override,var]
-        overridden:
-          public abstract fun <get-z2> (): kotlin.Int declared in <root>.IOther
-        $this: VALUE_PARAMETER name:<this> type:<root>.IOther
-      FUN FAKE_OVERRIDE name:<set-z2> visibility:public modality:ABSTRACT <> ($this:<root>.IOther, <set-?>:kotlin.Int) returnType:kotlin.Unit [fake_override]
-        correspondingProperty: PROPERTY FAKE_OVERRIDE name:z2 visibility:public modality:ABSTRACT [fake_override,var]
-        overridden:
-          public abstract fun <set-z2> (<set-?>: kotlin.Int): kotlin.Unit declared in <root>.IOther
-        $this: VALUE_PARAMETER name:<this> type:<root>.IOther
-        VALUE_PARAMETER name:<set-?> index:0 type:kotlin.Int

compiler/testData/ir/irText/classes/delegatedImplementationWithExplicitOverride.fir.txt

@@ -53,15 +53,23 @@ FILE fqName:<root> fileName:/delegatedImplementationWithExplicitOverride.kt
       BLOCK_BODY
         DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
         INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:C modality:FINAL visibility:public superTypes:[<root>.IFooBar]'
+        SET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IFooBar visibility:local [final]' type=kotlin.Unit origin=EQ
+          receiver: GET_VAR '<this>: <root>.C declared in <root>.C' type=<root>.C origin=null
+          value: GET_OBJECT 'CLASS OBJECT name:FooBarImpl modality:FINAL visibility:public superTypes:[<root>.IFooBar]' type=<root>.FooBarImpl
     FUN name:bar visibility:public modality:FINAL <> ($this:<root>.C) returnType:kotlin.Unit
       overridden:
         public abstract fun bar (): kotlin.Unit declared in <root>.IFooBar
       $this: VALUE_PARAMETER name:<this> type:<root>.C
       BLOCK_BODY
-    FUN FAKE_OVERRIDE name:foo visibility:public modality:ABSTRACT <> ($this:<root>.IFooBar) returnType:kotlin.Unit [fake_override]
+    FUN DELEGATED_MEMBER name:foo visibility:public modality:OPEN <> ($this:<root>.C) returnType:kotlin.Unit
       overridden:
         public abstract fun foo (): kotlin.Unit declared in <root>.IFooBar
-      $this: VALUE_PARAMETER name:<this> type:<root>.IFooBar
+      $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.C
+      BLOCK_BODY
+        CALL 'public abstract fun foo (): kotlin.Unit declared in <root>.IFooBar' type=kotlin.Unit origin=null
+          $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IFooBar visibility:local [final]' type=<root>.IFooBar origin=null
+            receiver: GET_VAR '<this>: <root>.C declared in <root>.C.foo' type=<root>.C origin=null
+    FIELD DELEGATE name:$$delegate_0 type:<root>.IFooBar visibility:local [final]
     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

compiler/testData/ir/irText/classes/implicitNotNullOnDelegatedImplementation.fir.txt

@@ -123,10 +123,19 @@ FILE fqName:<root> fileName:/implicitNotNullOnDelegatedImplementation.kt
       BLOCK_BODY
         DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
         INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:TestJFoo modality:FINAL visibility:public superTypes:[<root>.IFoo]'
-    FUN FAKE_OVERRIDE name:foo visibility:public modality:ABSTRACT <> ($this:<root>.IFoo) returnType:kotlin.String [fake_override]
+        SET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IFoo visibility:local [final]' type=kotlin.Unit origin=EQ
+          receiver: GET_VAR '<this>: <root>.TestJFoo declared in <root>.TestJFoo' type=<root>.TestJFoo origin=null
+          value: CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in <root>.JFoo' type=<root>.JFoo origin=null
+    FUN DELEGATED_MEMBER name:foo visibility:public modality:OPEN <> ($this:<root>.TestJFoo) returnType:kotlin.String
       overridden:
         public abstract fun foo (): kotlin.String declared in <root>.IFoo
-      $this: VALUE_PARAMETER name:<this> type:<root>.IFoo
+      $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.TestJFoo
+      BLOCK_BODY
+        RETURN type=kotlin.Nothing from='public open fun foo (): kotlin.String declared in <root>.TestJFoo'
+          CALL 'public abstract fun foo (): kotlin.String declared in <root>.IFoo' type=kotlin.String origin=null
+            $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IFoo visibility:local [final]' type=<root>.IFoo origin=null
+              receiver: GET_VAR '<this>: <root>.TestJFoo declared in <root>.TestJFoo.foo' type=<root>.TestJFoo origin=null
+    FIELD DELEGATE name:$$delegate_0 type:<root>.IFoo visibility:local [final]
     FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
       overridden:
         public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in kotlin.Any
@@ -146,10 +155,19 @@ FILE fqName:<root> fileName:/implicitNotNullOnDelegatedImplementation.kt
       BLOCK_BODY
         DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
         INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:TestK1 modality:FINAL visibility:public superTypes:[<root>.IFoo]'
-    FUN FAKE_OVERRIDE name:foo visibility:public modality:ABSTRACT <> ($this:<root>.IFoo) returnType:kotlin.String [fake_override]
+        SET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IFoo visibility:local [final]' type=kotlin.Unit origin=EQ
+          receiver: GET_VAR '<this>: <root>.TestK1 declared in <root>.TestK1' type=<root>.TestK1 origin=null
+          value: CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in <root>.K1' type=<root>.K1 origin=null
+    FUN DELEGATED_MEMBER name:foo visibility:public modality:OPEN <> ($this:<root>.TestK1) returnType:kotlin.String
       overridden:
         public abstract fun foo (): kotlin.String declared in <root>.IFoo
-      $this: VALUE_PARAMETER name:<this> type:<root>.IFoo
+      $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.TestK1
+      BLOCK_BODY
+        RETURN type=kotlin.Nothing from='public open fun foo (): kotlin.String declared in <root>.TestK1'
+          CALL 'public abstract fun foo (): kotlin.String declared in <root>.IFoo' type=kotlin.String origin=null
+            $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IFoo visibility:local [final]' type=<root>.IFoo origin=null
+              receiver: GET_VAR '<this>: <root>.TestK1 declared in <root>.TestK1.foo' type=<root>.TestK1 origin=null
+    FIELD DELEGATE name:$$delegate_0 type:<root>.IFoo visibility:local [final]
     FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
       overridden:
         public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in kotlin.Any
@@ -169,10 +187,19 @@ FILE fqName:<root> fileName:/implicitNotNullOnDelegatedImplementation.kt
       BLOCK_BODY
         DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
         INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:TestK2 modality:FINAL visibility:public superTypes:[<root>.IFoo]'
-    FUN FAKE_OVERRIDE name:foo visibility:public modality:ABSTRACT <> ($this:<root>.IFoo) returnType:kotlin.String [fake_override]
+        SET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IFoo visibility:local [final]' type=kotlin.Unit origin=EQ
+          receiver: GET_VAR '<this>: <root>.TestK2 declared in <root>.TestK2' type=<root>.TestK2 origin=null
+          value: CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in <root>.K2' type=<root>.K2 origin=null
+    FUN DELEGATED_MEMBER name:foo visibility:public modality:OPEN <> ($this:<root>.TestK2) returnType:kotlin.String
       overridden:
         public abstract fun foo (): kotlin.String declared in <root>.IFoo
-      $this: VALUE_PARAMETER name:<this> type:<root>.IFoo
+      $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.TestK2
+      BLOCK_BODY
+        RETURN type=kotlin.Nothing from='public open fun foo (): kotlin.String declared in <root>.TestK2'
+          CALL 'public abstract fun foo (): kotlin.String declared in <root>.IFoo' type=kotlin.String origin=null
+            $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IFoo visibility:local [final]' type=<root>.IFoo origin=null
+              receiver: GET_VAR '<this>: <root>.TestK2 declared in <root>.TestK2.foo' type=<root>.TestK2 origin=null
+    FIELD DELEGATE name:$$delegate_0 type:<root>.IFoo visibility:local [final]
     FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
       overridden:
         public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in kotlin.Any
@@ -192,10 +219,19 @@ FILE fqName:<root> fileName:/implicitNotNullOnDelegatedImplementation.kt
       BLOCK_BODY
         DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
         INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:TestK3 modality:FINAL visibility:public superTypes:[<root>.IFoo]'
-    FUN FAKE_OVERRIDE name:foo visibility:public modality:ABSTRACT <> ($this:<root>.IFoo) returnType:kotlin.String [fake_override]
+        SET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IFoo visibility:local [final]' type=kotlin.Unit origin=EQ
+          receiver: GET_VAR '<this>: <root>.TestK3 declared in <root>.TestK3' type=<root>.TestK3 origin=null
+          value: CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in <root>.K3' type=<root>.K3 origin=null
+    FUN DELEGATED_MEMBER name:foo visibility:public modality:OPEN <> ($this:<root>.TestK3) returnType:kotlin.String
       overridden:
         public abstract fun foo (): kotlin.String declared in <root>.IFoo
-      $this: VALUE_PARAMETER name:<this> type:<root>.IFoo
+      $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.TestK3
+      BLOCK_BODY
+        RETURN type=kotlin.Nothing from='public open fun foo (): kotlin.String declared in <root>.TestK3'
+          CALL 'public abstract fun foo (): kotlin.String declared in <root>.IFoo' type=kotlin.String origin=null
+            $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IFoo visibility:local [final]' type=<root>.IFoo origin=null
+              receiver: GET_VAR '<this>: <root>.TestK3 declared in <root>.TestK3.foo' type=<root>.TestK3 origin=null
+    FIELD DELEGATE name:$$delegate_0 type:<root>.IFoo visibility:local [final]
     FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
       overridden:
         public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in kotlin.Any
@@ -215,10 +251,19 @@ FILE fqName:<root> fileName:/implicitNotNullOnDelegatedImplementation.kt
       BLOCK_BODY
         DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
         INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:TestK4 modality:FINAL visibility:public superTypes:[<root>.IFoo]'
-    FUN FAKE_OVERRIDE name:foo visibility:public modality:ABSTRACT <> ($this:<root>.IFoo) returnType:kotlin.String [fake_override]
+        SET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IFoo visibility:local [final]' type=kotlin.Unit origin=EQ
+          receiver: GET_VAR '<this>: <root>.TestK4 declared in <root>.TestK4' type=<root>.TestK4 origin=null
+          value: CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in <root>.K4' type=<root>.K4 origin=null
+    FUN DELEGATED_MEMBER name:foo visibility:public modality:OPEN <> ($this:<root>.TestK4) returnType:kotlin.String
       overridden:
         public abstract fun foo (): kotlin.String declared in <root>.IFoo
-      $this: VALUE_PARAMETER name:<this> type:<root>.IFoo
+      $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.TestK4
+      BLOCK_BODY
+        RETURN type=kotlin.Nothing from='public open fun foo (): kotlin.String declared in <root>.TestK4'
+          CALL 'public abstract fun foo (): kotlin.String declared in <root>.IFoo' type=kotlin.String origin=null
+            $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IFoo visibility:local [final]' type=<root>.IFoo origin=null
+              receiver: GET_VAR '<this>: <root>.TestK4 declared in <root>.TestK4.foo' type=<root>.TestK4 origin=null
+    FIELD DELEGATE name:$$delegate_0 type:<root>.IFoo visibility:local [final]
     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

compiler/testData/ir/irText/declarations/kt35550.fir.txt

@@ -30,12 +30,22 @@ FILE fqName:<root> fileName:/kt35550.kt
       BLOCK_BODY
         DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
         INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:A modality:FINAL visibility:public superTypes:[<root>.I]'
-    PROPERTY FAKE_OVERRIDE name:id visibility:public modality:OPEN [fake_override,val]
-      FUN FAKE_OVERRIDE name:<get-id> visibility:public modality:OPEN <> ($this:<root>.I) returnType:T of <root>.I.<get-id> [fake_override]
-        correspondingProperty: PROPERTY FAKE_OVERRIDE name:id visibility:public modality:OPEN [fake_override,val]
+        SET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.I visibility:local [final]' type=kotlin.Unit origin=EQ
+          receiver: GET_VAR '<this>: <root>.A declared in <root>.A' type=<root>.A origin=null
+          value: GET_VAR 'i: <root>.I declared in <root>.A.<init>' type=<root>.I origin=null
+    PROPERTY DELEGATED_MEMBER name:id visibility:public modality:OPEN [val]
+      FUN DELEGATED_MEMBER name:<get-id> visibility:public modality:OPEN <> ($this:<root>.A) returnType:T of <root>.I.<get-id>
+        correspondingProperty: PROPERTY DELEGATED_MEMBER name:id visibility:public modality:OPEN [val]
         overridden:
           public open fun <get-id> <T> (): T of <root>.I.<get-id> declared in <root>.I
-        $this: VALUE_PARAMETER name:<this> type:<root>.I
+        $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.A
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='public open fun <get-id> (): T of <root>.I.<get-id> declared in <root>.A'
+            CALL 'public open fun <get-id> <T> (): T of <root>.I.<get-id> declared in <root>.I' type=T of <root>.I.<get-id> origin=null
+              <T>: <none>
+              $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.I visibility:local [final]' type=<root>.I origin=null
+                receiver: GET_VAR '<this>: <root>.A declared in <root>.A.<get-id>' type=<root>.A origin=null
+    FIELD DELEGATE name:$$delegate_0 type:<root>.I visibility:local [final]
     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

compiler/testData/ir/irText/declarations/parameters/delegatedMembers.fir.txt

@@ -35,24 +35,44 @@ FILE fqName:<root> fileName:/delegatedMembers.kt
       BLOCK_BODY
         DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
         INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:Test modality:FINAL visibility:public superTypes:[<root>.IBase<TT of <root>.Test>]'
-    FUN FAKE_OVERRIDE name:foo visibility:public modality:ABSTRACT <> ($this:<root>.IBase<T of <root>.IBase>, x:kotlin.Int) returnType:kotlin.Unit [fake_override]
+        SET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IBase<TT of <root>.Test> visibility:local [final]' type=kotlin.Unit origin=EQ
+          receiver: GET_VAR '<this>: <root>.Test<TT of <root>.Test> declared in <root>.Test' type=<root>.Test<TT of <root>.Test> origin=null
+          value: GET_VAR 'impl: <root>.IBase<TT of <root>.Test> declared in <root>.Test.<init>' type=<root>.IBase<TT of <root>.Test> origin=null
+    FUN DELEGATED_MEMBER name:foo visibility:public modality:OPEN <> ($this:<root>.Test<TT of <root>.Test>, x:kotlin.Int) returnType:kotlin.Unit
       overridden:
         public abstract fun foo (x: kotlin.Int): kotlin.Unit declared in <root>.IBase
-      $this: VALUE_PARAMETER name:<this> type:<root>.IBase<T of <root>.IBase>
-      VALUE_PARAMETER name:x index:0 type:kotlin.Int
-    PROPERTY FAKE_OVERRIDE name:bar visibility:public modality:ABSTRACT [fake_override,val]
-      FUN FAKE_OVERRIDE name:<get-bar> visibility:public modality:ABSTRACT <> ($this:<root>.IBase<T of <root>.IBase>) returnType:kotlin.Int [fake_override]
-        correspondingProperty: PROPERTY FAKE_OVERRIDE name:bar visibility:public modality:ABSTRACT [fake_override,val]
+      $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test<TT of <root>.Test>
+      VALUE_PARAMETER DELEGATED_MEMBER name:x index:0 type:kotlin.Int
+      BLOCK_BODY
+        CALL 'public abstract fun foo (x: kotlin.Int): kotlin.Unit declared in <root>.IBase' type=kotlin.Unit origin=null
+          $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IBase<TT of <root>.Test> visibility:local [final]' type=<root>.IBase<TT of <root>.Test> origin=null
+            receiver: GET_VAR '<this>: <root>.Test<TT of <root>.Test> declared in <root>.Test.foo' type=<root>.Test<TT of <root>.Test> origin=null
+          x: GET_VAR 'x: kotlin.Int declared in <root>.Test.foo' type=kotlin.Int origin=null
+    PROPERTY DELEGATED_MEMBER name:bar visibility:public modality:OPEN [val]
+      FUN DELEGATED_MEMBER name:<get-bar> visibility:public modality:OPEN <> ($this:<root>.Test<TT of <root>.Test>) returnType:kotlin.Int
+        correspondingProperty: PROPERTY DELEGATED_MEMBER name:bar visibility:public modality:OPEN [val]
         overridden:
           public abstract fun <get-bar> (): kotlin.Int declared in <root>.IBase
-        $this: VALUE_PARAMETER name:<this> type:<root>.IBase<T of <root>.IBase>
-    FUN FAKE_OVERRIDE name:qux visibility:public modality:ABSTRACT <X> ($this:<root>.IBase<T of <root>.IBase>, t:TT of <root>.Test, x:X of <root>.Test.qux) returnType:kotlin.Unit [fake_override]
+        $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test<TT of <root>.Test>
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='public open fun <get-bar> (): kotlin.Int declared in <root>.Test'
+            CALL 'public abstract fun <get-bar> (): kotlin.Int declared in <root>.IBase' type=kotlin.Int origin=null
+              $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IBase<TT of <root>.Test> visibility:local [final]' type=<root>.IBase<TT of <root>.Test> origin=null
+                receiver: GET_VAR '<this>: <root>.Test<TT of <root>.Test> declared in <root>.Test.<get-bar>' type=<root>.Test<TT of <root>.Test> origin=null
+    FUN DELEGATED_MEMBER name:qux visibility:public modality:OPEN <> ($this:<root>.Test<TT of <root>.Test>, t:T of <root>.IBase, x:X of <root>.IBase.qux) returnType:kotlin.Unit
       overridden:
         public abstract fun qux <X> (t: T of <root>.IBase, x: X of <root>.IBase.qux): kotlin.Unit declared in <root>.IBase
-      TYPE_PARAMETER name:X index:0 variance: superTypes:[kotlin.Any?]
-      $this: VALUE_PARAMETER name:<this> type:<root>.IBase<T of <root>.IBase>
-      VALUE_PARAMETER name:t index:0 type:TT of <root>.Test
-      VALUE_PARAMETER name:x index:1 type:X of <root>.Test.qux
+      $this: VALUE_PARAMETER DELEGATED_MEMBER name:<this> type:<root>.Test<TT of <root>.Test>
+      VALUE_PARAMETER DELEGATED_MEMBER name:t index:0 type:T of <root>.IBase
+      VALUE_PARAMETER DELEGATED_MEMBER name:x index:1 type:X of <root>.IBase.qux
+      BLOCK_BODY
+        CALL 'public abstract fun qux <X> (t: T of <root>.IBase, x: X of <root>.IBase.qux): kotlin.Unit declared in <root>.IBase' type=kotlin.Unit origin=null
+          <X>: <none>
+          $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.IBase<TT of <root>.Test> visibility:local [final]' type=<root>.IBase<TT of <root>.Test> origin=null
+            receiver: GET_VAR '<this>: <root>.Test<TT of <root>.Test> declared in <root>.Test.qux' type=<root>.Test<TT of <root>.Test> origin=null
+          t: GET_VAR 't: T of <root>.IBase declared in <root>.Test.qux' type=T of <root>.IBase origin=null
+          x: GET_VAR 'x: X of <root>.IBase.qux declared in <root>.Test.qux' type=X of <root>.IBase.qux origin=null
+    FIELD DELEGATE name:$$delegate_0 type:<root>.IBase<TT of <root>.Test> visibility:local [final]
     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