FILE fqName:<root> fileName:/implicitNotNullOnDelegatedImplementation.kt
  CLASS INTERFACE name:IFoo modality:ABSTRACT visibility:public superTypes:[kotlin.Any]
    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.IFoo
    FUN name:foo visibility:public modality:ABSTRACT <> ($this:<root>.IFoo) returnType:kotlin.String
      $this: VALUE_PARAMETER name:<this> type:<root>.IFoo
    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($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
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
      overridden:
        public open fun hashCode (): kotlin.Int declared in kotlin.Any
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
      overridden:
        public open fun toString (): kotlin.String declared in kotlin.Any
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
  CLASS CLASS name:K1 modality:FINAL visibility:public superTypes:[<root>.JFoo]
    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.K1
    CONSTRUCTOR visibility:public <> () returnType:<root>.K1 [primary]
      BLOCK_BODY
        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in <root>.JFoo'
        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:K1 modality:FINAL visibility:public superTypes:[<root>.JFoo]'
    FUN FAKE_OVERRIDE name:foo visibility:public modality:OPEN <> ($this:<root>.JFoo) returnType:@[EnhancedNullability] kotlin.String [fake_override]
      overridden:
        public open fun foo (): @[EnhancedNullability] kotlin.String declared in <root>.JFoo
      $this: VALUE_PARAMETER name:<this> type:<root>.JFoo
    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
      overridden:
        public open fun equals (other: kotlin.Any?): kotlin.Boolean [fake_override,operator] declared in <root>.JFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
      overridden:
        public open fun hashCode (): kotlin.Int [fake_override] declared in <root>.JFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
      overridden:
        public open fun toString (): kotlin.String [fake_override] declared in <root>.JFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
  CLASS CLASS name:K2 modality:FINAL visibility:public superTypes:[<root>.JFoo]
    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.K2
    CONSTRUCTOR visibility:public <> () returnType:<root>.K2 [primary]
      BLOCK_BODY
        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in <root>.JFoo'
        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:K2 modality:FINAL visibility:public superTypes:[<root>.JFoo]'
    FUN name:foo visibility:public modality:OPEN <> ($this:<root>.K2) returnType:kotlin.String
      overridden:
        public open fun foo (): @[EnhancedNullability] kotlin.String declared in <root>.JFoo
      $this: VALUE_PARAMETER name:<this> type:<root>.K2
      BLOCK_BODY
        RETURN type=kotlin.Nothing from='public open fun foo (): kotlin.String declared in <root>.K2'
          TYPE_OP type=kotlin.String origin=IMPLICIT_NOTNULL typeOperand=kotlin.String
            CALL 'public open fun foo (): @[EnhancedNullability] kotlin.String declared in <root>.JFoo' superQualifier='CLASS IR_EXTERNAL_JAVA_DECLARATION_STUB CLASS name:JFoo modality:OPEN visibility:public superTypes:[<root>.IFoo]' type=@[EnhancedNullability] kotlin.String origin=null
              $this: GET_VAR '<this>: <root>.K2 declared in <root>.K2.foo' type=<root>.K2 origin=null
    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
      overridden:
        public open fun equals (other: kotlin.Any?): kotlin.Boolean [fake_override,operator] declared in <root>.JFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
      overridden:
        public open fun hashCode (): kotlin.Int [fake_override] declared in <root>.JFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
      overridden:
        public open fun toString (): kotlin.String [fake_override] declared in <root>.JFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
  CLASS CLASS name:K3 modality:FINAL visibility:public superTypes:[<root>.JUnrelatedFoo; <root>.IFoo]
    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.K3
    CONSTRUCTOR visibility:public <> () returnType:<root>.K3 [primary]
      BLOCK_BODY
        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in <root>.JUnrelatedFoo'
        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:K3 modality:FINAL visibility:public superTypes:[<root>.JUnrelatedFoo; <root>.IFoo]'
    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
      overridden:
        public open fun equals (other: kotlin.Any?): kotlin.Boolean [fake_override,operator] declared in <root>.JUnrelatedFoo
        public open fun equals (other: kotlin.Any?): kotlin.Boolean [fake_override,operator] declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
      overridden:
        public open fun hashCode (): kotlin.Int [fake_override] declared in <root>.JUnrelatedFoo
        public open fun hashCode (): kotlin.Int [fake_override] declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
      overridden:
        public open fun toString (): kotlin.String [fake_override] declared in <root>.JUnrelatedFoo
        public open fun toString (): kotlin.String [fake_override] declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
    FUN FAKE_OVERRIDE name:foo visibility:public modality:OPEN <> ($this:<root>.IFoo) returnType:kotlin.String [fake_override]
      overridden:
        public open fun foo (): @[FlexibleNullability] kotlin.String? declared in <root>.JUnrelatedFoo
        public abstract fun foo (): kotlin.String declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:<root>.IFoo
  CLASS CLASS name:K4 modality:FINAL visibility:public superTypes:[<root>.JUnrelatedFoo; <root>.IFoo]
    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.K4
    CONSTRUCTOR visibility:public <> () returnType:<root>.K4 [primary]
      BLOCK_BODY
        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in <root>.JUnrelatedFoo'
        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:K4 modality:FINAL visibility:public superTypes:[<root>.JUnrelatedFoo; <root>.IFoo]'
    FUN name:foo visibility:public modality:OPEN <> ($this:<root>.K4) returnType:@[FlexibleNullability] kotlin.String?
      overridden:
        public open fun foo (): @[FlexibleNullability] kotlin.String? declared in <root>.JUnrelatedFoo
        public abstract fun foo (): kotlin.String declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:<root>.K4
      BLOCK_BODY
        RETURN type=kotlin.Nothing from='public open fun foo (): @[FlexibleNullability] kotlin.String? declared in <root>.K4'
          CALL 'public open fun foo (): @[FlexibleNullability] kotlin.String? declared in <root>.JUnrelatedFoo' superQualifier='CLASS IR_EXTERNAL_JAVA_DECLARATION_STUB CLASS name:JUnrelatedFoo modality:OPEN visibility:public superTypes:[kotlin.Any]' type=@[FlexibleNullability] kotlin.String? origin=null
            $this: GET_VAR '<this>: <root>.K4 declared in <root>.K4.foo' type=<root>.K4 origin=null
    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
      overridden:
        public open fun equals (other: kotlin.Any?): kotlin.Boolean [fake_override,operator] declared in <root>.JUnrelatedFoo
        public open fun equals (other: kotlin.Any?): kotlin.Boolean [fake_override,operator] declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
      overridden:
        public open fun hashCode (): kotlin.Int [fake_override] declared in <root>.JUnrelatedFoo
        public open fun hashCode (): kotlin.Int [fake_override] declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
      overridden:
        public open fun toString (): kotlin.String [fake_override] declared in <root>.JUnrelatedFoo
        public open fun toString (): kotlin.String [fake_override] declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
  CLASS CLASS name:TestJFoo modality:FINAL visibility:public superTypes:[<root>.IFoo]
    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.TestJFoo
    CONSTRUCTOR visibility:public <> () returnType:<root>.TestJFoo [primary]
      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]'
    FIELD DELEGATE name:$$delegate_0 type:<root>.JFoo visibility:private [final]
      EXPRESSION_BODY
        CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in <root>.JFoo' type=<root>.JFoo origin=null
    FUN DELEGATED_MEMBER name:foo visibility:public modality:OPEN <> ($this:<root>.TestJFoo) returnType:kotlin.String
      overridden:
        public abstract fun foo (): kotlin.String declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:<root>.TestJFoo
      BLOCK_BODY
        RETURN type=kotlin.Nothing from='public open fun foo (): kotlin.String declared in <root>.TestJFoo'
          TYPE_OP type=kotlin.String origin=IMPLICIT_NOTNULL typeOperand=kotlin.String
            CALL 'public open fun foo (): @[EnhancedNullability] kotlin.String declared in <root>.JFoo' type=@[EnhancedNullability] kotlin.String origin=null
              $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.JFoo visibility:private [final]' type=<root>.JFoo origin=null
                receiver: GET_VAR '<this>: <root>.TestJFoo declared in <root>.TestJFoo.foo' type=<root>.TestJFoo 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 [fake_override,operator] declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
      overridden:
        public open fun hashCode (): kotlin.Int [fake_override] declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
      overridden:
        public open fun toString (): kotlin.String [fake_override] declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
  CLASS CLASS name:TestK1 modality:FINAL visibility:public superTypes:[<root>.IFoo]
    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.TestK1
    CONSTRUCTOR visibility:public <> () returnType:<root>.TestK1 [primary]
      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]'
    FIELD DELEGATE name:$$delegate_0 type:<root>.K1 visibility:private [final]
      EXPRESSION_BODY
        CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in <root>.K1' type=<root>.K1 origin=null
    FUN DELEGATED_MEMBER name:foo visibility:public modality:OPEN <> ($this:<root>.TestK1) returnType:kotlin.String
      overridden:
        public abstract fun foo (): kotlin.String declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:<root>.TestK1
      BLOCK_BODY
        RETURN type=kotlin.Nothing from='public open fun foo (): kotlin.String declared in <root>.TestK1'
          TYPE_OP type=kotlin.String origin=IMPLICIT_NOTNULL typeOperand=kotlin.String
            CALL 'public open fun foo (): @[EnhancedNullability] kotlin.String [fake_override] declared in <root>.K1' type=@[EnhancedNullability] kotlin.String origin=null
              $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.K1 visibility:private [final]' type=<root>.K1 origin=null
                receiver: GET_VAR '<this>: <root>.TestK1 declared in <root>.TestK1.foo' type=<root>.TestK1 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 [fake_override,operator] declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
      overridden:
        public open fun hashCode (): kotlin.Int [fake_override] declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
      overridden:
        public open fun toString (): kotlin.String [fake_override] declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
  CLASS CLASS name:TestK2 modality:FINAL visibility:public superTypes:[<root>.IFoo]
    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.TestK2
    CONSTRUCTOR visibility:public <> () returnType:<root>.TestK2 [primary]
      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]'
    FIELD DELEGATE name:$$delegate_0 type:<root>.K2 visibility:private [final]
      EXPRESSION_BODY
        CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in <root>.K2' type=<root>.K2 origin=null
    FUN DELEGATED_MEMBER name:foo visibility:public modality:OPEN <> ($this:<root>.TestK2) returnType:kotlin.String
      overridden:
        public abstract fun foo (): kotlin.String declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:<root>.TestK2
      BLOCK_BODY
        RETURN type=kotlin.Nothing from='public open fun foo (): kotlin.String declared in <root>.TestK2'
          CALL 'public open fun foo (): kotlin.String declared in <root>.K2' type=kotlin.String origin=null
            $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.K2 visibility:private [final]' type=<root>.K2 origin=null
              receiver: GET_VAR '<this>: <root>.TestK2 declared in <root>.TestK2.foo' type=<root>.TestK2 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 [fake_override,operator] declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
      overridden:
        public open fun hashCode (): kotlin.Int [fake_override] declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
      overridden:
        public open fun toString (): kotlin.String [fake_override] declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
  CLASS CLASS name:TestK3 modality:FINAL visibility:public superTypes:[<root>.IFoo]
    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.TestK3
    CONSTRUCTOR visibility:public <> () returnType:<root>.TestK3 [primary]
      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]'
    FIELD DELEGATE name:$$delegate_0 type:<root>.K3 visibility:private [final]
      EXPRESSION_BODY
        CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in <root>.K3' type=<root>.K3 origin=null
    FUN DELEGATED_MEMBER name:foo visibility:public modality:OPEN <> ($this:<root>.TestK3) returnType:kotlin.String
      overridden:
        public abstract fun foo (): kotlin.String declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:<root>.TestK3
      BLOCK_BODY
        RETURN type=kotlin.Nothing from='public open fun foo (): kotlin.String declared in <root>.TestK3'
          CALL 'public open fun foo (): kotlin.String [fake_override] declared in <root>.K3' type=kotlin.String origin=null
            $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.K3 visibility:private [final]' type=<root>.K3 origin=null
              receiver: GET_VAR '<this>: <root>.TestK3 declared in <root>.TestK3.foo' type=<root>.TestK3 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 [fake_override,operator] declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
      overridden:
        public open fun hashCode (): kotlin.Int [fake_override] declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
      overridden:
        public open fun toString (): kotlin.String [fake_override] declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
  CLASS CLASS name:TestK4 modality:FINAL visibility:public superTypes:[<root>.IFoo]
    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.TestK4
    CONSTRUCTOR visibility:public <> () returnType:<root>.TestK4 [primary]
      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]'
    FIELD DELEGATE name:$$delegate_0 type:<root>.K4 visibility:private [final]
      EXPRESSION_BODY
        CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in <root>.K4' type=<root>.K4 origin=null
    FUN DELEGATED_MEMBER name:foo visibility:public modality:OPEN <> ($this:<root>.TestK4) returnType:kotlin.String
      overridden:
        public abstract fun foo (): kotlin.String declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:<root>.TestK4
      BLOCK_BODY
        RETURN type=kotlin.Nothing from='public open fun foo (): kotlin.String declared in <root>.TestK4'
          TYPE_OP type=kotlin.String origin=IMPLICIT_NOTNULL typeOperand=kotlin.String
            CALL 'public open fun foo (): @[FlexibleNullability] kotlin.String? declared in <root>.K4' type=@[FlexibleNullability] kotlin.String? origin=null
              $this: GET_FIELD 'FIELD DELEGATE name:$$delegate_0 type:<root>.K4 visibility:private [final]' type=<root>.K4 origin=null
                receiver: GET_VAR '<this>: <root>.TestK4 declared in <root>.TestK4.foo' type=<root>.TestK4 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 [fake_override,operator] declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
      overridden:
        public open fun hashCode (): kotlin.Int [fake_override] declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
      overridden:
        public open fun toString (): kotlin.String [fake_override] declared in <root>.IFoo
      $this: VALUE_PARAMETER name:<this> type:kotlin.Any