FIR: Add missing iterator function to array types in IrBuiltInsOverFir

Fixes part of KT-57627

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/IrBuiltInsOverFir.kt

@@ -206,10 +206,13 @@ class IrBuiltInsOverFir(
         IrConstructorCallImpl.Companion.fromSymbolOwner(intrinsicConst.defaultType, constructor)
     }
 
+    private val iterator by loadClass(StandardClassIds.Iterator)
+    override val iteratorClass: IrClassSymbol get() = iterator.klass
+
     private val array by createClass(kotlinIrPackage, IdSignatureValues.array) {
         configureSuperTypes()
         val typeParameter = addTypeParameter("T", anyNType)
-        addArrayMembers(typeParameter.defaultType)
+        addArrayMembers(typeParameter.defaultType, iteratorClass.typeWith(typeParameter.defaultType))
         finalizeClassDefinition()
     }
     override val arrayClass: IrClassSymbol get() = array.klass
@@ -234,8 +237,6 @@ class IrBuiltInsOverFir(
 
     private val iterable by loadClass(StandardClassIds.Iterable)
     override val iterableClass: IrClassSymbol get() = iterable.klass
-    private val iterator by loadClass(StandardClassIds.Iterator)
-    override val iteratorClass: IrClassSymbol get() = iterator.klass
     private val listIterator by loadClass(StandardClassIds.ListIterator)
     override val listIteratorClass: IrClassSymbol get() = listIterator.klass
     private val mutableCollection by loadClass(StandardClassIds.MutableCollection)
@@ -323,14 +324,26 @@ class IrBuiltInsOverFir(
             else -> intType
         }
 
-    private val _booleanArray by createPrimitiveArrayClass(kotlinIrPackage, PrimitiveType.BOOLEAN)
+    private fun primitiveIterator(primitiveType: PrimitiveType) =
-    private val _charArray by createPrimitiveArrayClass(kotlinIrPackage, PrimitiveType.CHAR)
+        loadClass(ClassId(StandardClassIds.BASE_COLLECTIONS_PACKAGE, Name.identifier("${primitiveType.typeName}Iterator")))
-    private val _byteArray by createPrimitiveArrayClass(kotlinIrPackage, PrimitiveType.BYTE)
+
-    private val _shortArray by createPrimitiveArrayClass(kotlinIrPackage, PrimitiveType.SHORT)
+    private val booleanIterator by primitiveIterator(PrimitiveType.BOOLEAN)
-    private val _intArray by createPrimitiveArrayClass(kotlinIrPackage, PrimitiveType.INT)
+    private val charIterator by primitiveIterator(PrimitiveType.CHAR)
-    private val _longArray by createPrimitiveArrayClass(kotlinIrPackage, PrimitiveType.LONG)
+    private val byteIterator by primitiveIterator(PrimitiveType.BYTE)
-    private val _floatArray by createPrimitiveArrayClass(kotlinIrPackage, PrimitiveType.FLOAT)
+    private val shortIterator by primitiveIterator(PrimitiveType.SHORT)
-    private val _doubleArray by createPrimitiveArrayClass(kotlinIrPackage, PrimitiveType.DOUBLE)
+    private val intIterator by primitiveIterator(PrimitiveType.INT)
+    private val longIterator by primitiveIterator(PrimitiveType.LONG)
+    private val floatIterator by primitiveIterator(PrimitiveType.FLOAT)
+    private val doubleIterator by primitiveIterator(PrimitiveType.DOUBLE)
+
+    private val _booleanArray by createPrimitiveArrayClass(kotlinIrPackage, PrimitiveType.BOOLEAN, booleanIterator)
+    private val _charArray by createPrimitiveArrayClass(kotlinIrPackage, PrimitiveType.CHAR, charIterator)
+    private val _byteArray by createPrimitiveArrayClass(kotlinIrPackage, PrimitiveType.BYTE, byteIterator)
+    private val _shortArray by createPrimitiveArrayClass(kotlinIrPackage, PrimitiveType.SHORT, shortIterator)
+    private val _intArray by createPrimitiveArrayClass(kotlinIrPackage, PrimitiveType.INT, intIterator)
+    private val _longArray by createPrimitiveArrayClass(kotlinIrPackage, PrimitiveType.LONG, longIterator)
+    private val _floatArray by createPrimitiveArrayClass(kotlinIrPackage, PrimitiveType.FLOAT, floatIterator)
+    private val _doubleArray by createPrimitiveArrayClass(kotlinIrPackage, PrimitiveType.DOUBLE, doubleIterator)
 
     override val booleanArray: IrClassSymbol get() = _booleanArray.klass
     override val charArray: IrClassSymbol get() = _charArray.klass
@@ -921,7 +934,7 @@ class IrBuiltInsOverFir(
         return components.symbolTable.declareSimpleFunction(signature, { IrSimpleFunctionPublicSymbolImpl(signature, null) }, ::makeWithSymbol)
     }
 
-    private fun IrClass.addArrayMembers(elementType: IrType) {
+    private fun IrClass.addArrayMembers(elementType: IrType, iteratorType: IrType) {
         addConstructor {
             origin = object : IrDeclarationOriginImpl("BUILTIN_CLASS_CONSTRUCTOR") {}
             returnType = defaultType
@@ -932,6 +945,7 @@ class IrBuiltInsOverFir(
         createMemberFunction(OperatorNameConventions.GET, elementType, "index" to intType, isOperator = true, isIntrinsicConst = false)
         createMemberFunction(OperatorNameConventions.SET, unitType, "index" to intType, "value" to elementType, isOperator = true, isIntrinsicConst = false)
         createProperty("size", intType)
+        createMemberFunction(OperatorNameConventions.ITERATOR, iteratorType, isOperator = true)
     }
 
     private fun IrClass.createProperty(
@@ -1064,7 +1078,7 @@ class IrBuiltInsOverFir(
     private fun createPrimitiveArrayClass(
         parent: IrDeclarationParent,
         primitiveType: PrimitiveType,
-        lazyContents: (IrClass.() -> Unit)? = null
+        primitiveIterator: BuiltInClassValue
     ) =
         createClass(
             parent,
@@ -1072,8 +1086,8 @@ class IrBuiltInsOverFir(
             build = { modality = Modality.FINAL }
         ) {
             configureSuperTypes()
-            addArrayMembers(primitiveTypeToIrType[primitiveType]!!)
+            primitiveIterator.ensureLazyContentsCreated()
-            lazyContents?.invoke(this)
+            addArrayMembers(primitiveTypeToIrType[primitiveType]!!, primitiveIterator.type)
             finalizeClassDefinition()
         }
 

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/ir/FirLightTreeJvmIrTextTestGenerated.java

@@ -3102,6 +3102,12 @@ public class FirLightTreeJvmIrTextTestGenerated extends AbstractFirLightTreeJvmI
             KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/ir/irText/stubs"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.JVM_IR, true);
         }
 
+        @Test
+        @TestMetadata("arraysFromBuiltins.kt")
+        public void testArraysFromBuiltins() throws Exception {
+            runTest("compiler/testData/ir/irText/stubs/arraysFromBuiltins.kt");
+        }
+
         @Test
         @TestMetadata("builtinMap.kt")
         public void testBuiltinMap() throws Exception {

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/ir/FirPsiJvmIrTextTestGenerated.java

@@ -3102,6 +3102,12 @@ public class FirPsiJvmIrTextTestGenerated extends AbstractFirPsiJvmIrTextTest {
             KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/ir/irText/stubs"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.JVM_IR, true);
         }
 
+        @Test
+        @TestMetadata("arraysFromBuiltins.kt")
+        public void testArraysFromBuiltins() throws Exception {
+            runTest("compiler/testData/ir/irText/stubs/arraysFromBuiltins.kt");
+        }
+
         @Test
         @TestMetadata("builtinMap.kt")
         public void testBuiltinMap() throws Exception {

compiler/testData/ir/irText/stubs/arraysFromBuiltins.__kotlin.Array.fir.ir.txt

@@ -0,0 +1,33 @@
+CLASS IR_EXTERNAL_DECLARATION_STUB CLASS name:Array modality:FINAL visibility:public superTypes:[kotlin.Any; kotlin.Cloneable; java.io.Serializable]
+  $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:kotlin.Array<T of kotlin.Array>
+  TYPE_PARAMETER name:T index:0 variance: superTypes:[kotlin.Any?] reified:false
+  CONSTRUCTOR BUILTIN_CLASS_CONSTRUCTOR visibility:public <> (size:kotlin.Int) returnType:kotlin.Array [primary]
+    VALUE_PARAMETER BUILTIN_CLASS_CONSTRUCTOR name:size index:0 type:kotlin.Int
+  FUN BUILTIN_CLASS_METHOD name:get visibility:public modality:FINAL <> ($this:kotlin.Array, index:kotlin.Int) returnType:T of kotlin.Array [operator]
+    $this: VALUE_PARAMETER name:$this type:kotlin.Array
+    VALUE_PARAMETER BUILTIN_CLASS_METHOD name:index index:0 type:kotlin.Int
+  FUN BUILTIN_CLASS_METHOD name:set visibility:public modality:FINAL <> ($this:kotlin.Array, index:kotlin.Int, value:T of kotlin.Array) returnType:kotlin.Unit [operator]
+    $this: VALUE_PARAMETER name:$this type:kotlin.Array
+    VALUE_PARAMETER BUILTIN_CLASS_METHOD name:index index:0 type:kotlin.Int
+    VALUE_PARAMETER BUILTIN_CLASS_METHOD name:value index:1 type:T of kotlin.Array
+  PROPERTY name:size visibility:public modality:FINAL [val]
+    FUN name:<get-size> visibility:public modality:FINAL <> ($this:kotlin.Array) returnType:kotlin.Int
+      correspondingProperty: PROPERTY name:size visibility:public modality:FINAL [val]
+      $this: VALUE_PARAMETER name:$this type:kotlin.Array
+  FUN BUILTIN_CLASS_METHOD name:iterator visibility:public modality:FINAL <> ($this:kotlin.Array) returnType:kotlin.collections.Iterator<T of kotlin.Array> [operator]
+    annotations:
+      IntrinsicConstEvaluation
+    $this: VALUE_PARAMETER name:$this type:kotlin.Array
+  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 BUILTIN_CLASS_METHOD 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

compiler/testData/ir/irText/stubs/arraysFromBuiltins.__kotlin.Array.ir.txt

@@ -0,0 +1,39 @@
+CLASS IR_EXTERNAL_DECLARATION_STUB CLASS name:Array modality:FINAL visibility:public superTypes:[kotlin.Any; kotlin.Cloneable; java.io.Serializable]
+  $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.Array<T of kotlin.Array>
+  TYPE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:T index:0 variance: superTypes:[kotlin.Any?] reified:false
+  CONSTRUCTOR IR_EXTERNAL_DECLARATION_STUB visibility:public <> (size:kotlin.Int, init:kotlin.Function1<kotlin.Int, T of kotlin.Array>) returnType:kotlin.Array<T of kotlin.Array>
+    VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:size index:0 type:kotlin.Int
+    VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:init index:1 type:kotlin.Function1<kotlin.Int, T of kotlin.Array>
+  PROPERTY IR_EXTERNAL_DECLARATION_STUB name:size visibility:public modality:FINAL [val]
+    FUN IR_EXTERNAL_DECLARATION_STUB name:<get-size> visibility:public modality:FINAL <> ($this:kotlin.Array<T of kotlin.Array>) returnType:kotlin.Int
+      correspondingProperty: PROPERTY IR_EXTERNAL_DECLARATION_STUB name:size visibility:public modality:FINAL [val]
+      $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.Array<T of kotlin.Array>
+  FUN IR_EXTERNAL_DECLARATION_STUB name:clone visibility:public modality:OPEN <> ($this:kotlin.Array<T of kotlin.Array>) returnType:kotlin.Array<T of kotlin.Array>
+    overridden:
+      protected open fun clone (): kotlin.Any declared in kotlin.Cloneable
+    $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.Array<T of kotlin.Array>
+  FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($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
+      public open fun equals (other: kotlin.Any?): kotlin.Boolean [fake_override,operator] declared in kotlin.Cloneable
+    $this: VALUE_PARAMETER FAKE_OVERRIDE name:<this> type:kotlin.Any
+    VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:other index:0 type:kotlin.Any?
+  FUN IR_EXTERNAL_DECLARATION_STUB name:get visibility:public modality:FINAL <> ($this:kotlin.Array<T of kotlin.Array>, index:kotlin.Int) returnType:T of kotlin.Array [operator]
+    $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.Array<T of kotlin.Array>
+    VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:index index:0 type:kotlin.Int
+  FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+    overridden:
+      public open fun hashCode (): kotlin.Int declared in kotlin.Any
+      public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.Cloneable
+    $this: VALUE_PARAMETER FAKE_OVERRIDE name:<this> type:kotlin.Any
+  FUN IR_EXTERNAL_DECLARATION_STUB name:iterator visibility:public modality:FINAL <> ($this:kotlin.Array<T of kotlin.Array>) returnType:kotlin.collections.Iterator<T of kotlin.Array> [operator]
+    $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.Array<T of kotlin.Array>
+  FUN IR_EXTERNAL_DECLARATION_STUB name:set visibility:public modality:FINAL <> ($this:kotlin.Array<T of kotlin.Array>, index:kotlin.Int, value:T of kotlin.Array) returnType:kotlin.Unit [operator]
+    $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.Array<T of kotlin.Array>
+    VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:index index:0 type:kotlin.Int
+    VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:value index:1 type:T of kotlin.Array
+  FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+    overridden:
+      public open fun toString (): kotlin.String declared in kotlin.Any
+      public open fun toString (): kotlin.String [fake_override] declared in kotlin.Cloneable
+    $this: VALUE_PARAMETER FAKE_OVERRIDE name:<this> type:kotlin.Any

compiler/testData/ir/irText/stubs/arraysFromBuiltins.__kotlin.IntArray.fir.ir.txt

@@ -0,0 +1,32 @@
+CLASS IR_EXTERNAL_DECLARATION_STUB CLASS name:IntArray modality:FINAL visibility:public superTypes:[kotlin.Any; kotlin.Cloneable; java.io.Serializable]
+  $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:kotlin.IntArray
+  CONSTRUCTOR BUILTIN_CLASS_CONSTRUCTOR visibility:public <> (size:kotlin.Int) returnType:kotlin.IntArray [primary]
+    VALUE_PARAMETER BUILTIN_CLASS_CONSTRUCTOR name:size index:0 type:kotlin.Int
+  FUN BUILTIN_CLASS_METHOD name:get visibility:public modality:FINAL <> ($this:kotlin.IntArray, index:kotlin.Int) returnType:kotlin.Int [operator]
+    $this: VALUE_PARAMETER name:$this type:kotlin.IntArray
+    VALUE_PARAMETER BUILTIN_CLASS_METHOD name:index index:0 type:kotlin.Int
+  FUN BUILTIN_CLASS_METHOD name:set visibility:public modality:FINAL <> ($this:kotlin.IntArray, index:kotlin.Int, value:kotlin.Int) returnType:kotlin.Unit [operator]
+    $this: VALUE_PARAMETER name:$this type:kotlin.IntArray
+    VALUE_PARAMETER BUILTIN_CLASS_METHOD name:index index:0 type:kotlin.Int
+    VALUE_PARAMETER BUILTIN_CLASS_METHOD name:value index:1 type:kotlin.Int
+  PROPERTY name:size visibility:public modality:FINAL [val]
+    FUN name:<get-size> visibility:public modality:FINAL <> ($this:kotlin.IntArray) returnType:kotlin.Int
+      correspondingProperty: PROPERTY name:size visibility:public modality:FINAL [val]
+      $this: VALUE_PARAMETER name:$this type:kotlin.IntArray
+  FUN BUILTIN_CLASS_METHOD name:iterator visibility:public modality:FINAL <> ($this:kotlin.IntArray) returnType:kotlin.collections.IntIterator [operator]
+    annotations:
+      IntrinsicConstEvaluation
+    $this: VALUE_PARAMETER name:$this type:kotlin.IntArray
+  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 BUILTIN_CLASS_METHOD 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

compiler/testData/ir/irText/stubs/arraysFromBuiltins.__kotlin.IntArray.ir.txt

@@ -0,0 +1,40 @@
+CLASS IR_EXTERNAL_DECLARATION_STUB CLASS name:IntArray modality:FINAL visibility:public superTypes:[kotlin.Any; kotlin.Cloneable; java.io.Serializable]
+  $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.IntArray
+  CONSTRUCTOR IR_EXTERNAL_DECLARATION_STUB visibility:public <> (size:kotlin.Int, init:kotlin.Function1<kotlin.Int, kotlin.Int>) returnType:kotlin.IntArray
+    VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:size index:0 type:kotlin.Int
+    VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:init index:1 type:kotlin.Function1<kotlin.Int, kotlin.Int>
+  CONSTRUCTOR IR_EXTERNAL_DECLARATION_STUB visibility:public <> (size:kotlin.Int) returnType:kotlin.IntArray [primary]
+    VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:size index:0 type:kotlin.Int
+  PROPERTY IR_EXTERNAL_DECLARATION_STUB name:size visibility:public modality:FINAL [val]
+    FUN IR_EXTERNAL_DECLARATION_STUB name:<get-size> visibility:public modality:FINAL <> ($this:kotlin.IntArray) returnType:kotlin.Int
+      correspondingProperty: PROPERTY IR_EXTERNAL_DECLARATION_STUB name:size visibility:public modality:FINAL [val]
+      $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.IntArray
+  FUN IR_EXTERNAL_DECLARATION_STUB name:clone visibility:public modality:OPEN <> ($this:kotlin.IntArray) returnType:kotlin.IntArray
+    overridden:
+      protected open fun clone (): kotlin.Any declared in kotlin.Cloneable
+    $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.IntArray
+  FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($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
+      public open fun equals (other: kotlin.Any?): kotlin.Boolean [fake_override,operator] declared in kotlin.Cloneable
+    $this: VALUE_PARAMETER FAKE_OVERRIDE name:<this> type:kotlin.Any
+    VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:other index:0 type:kotlin.Any?
+  FUN IR_EXTERNAL_DECLARATION_STUB name:get visibility:public modality:FINAL <> ($this:kotlin.IntArray, index:kotlin.Int) returnType:kotlin.Int [operator]
+    $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.IntArray
+    VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:index index:0 type:kotlin.Int
+  FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+    overridden:
+      public open fun hashCode (): kotlin.Int declared in kotlin.Any
+      public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.Cloneable
+    $this: VALUE_PARAMETER FAKE_OVERRIDE name:<this> type:kotlin.Any
+  FUN IR_EXTERNAL_DECLARATION_STUB name:iterator visibility:public modality:FINAL <> ($this:kotlin.IntArray) returnType:kotlin.collections.IntIterator [operator]
+    $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.IntArray
+  FUN IR_EXTERNAL_DECLARATION_STUB name:set visibility:public modality:FINAL <> ($this:kotlin.IntArray, index:kotlin.Int, value:kotlin.Int) returnType:kotlin.Unit [operator]
+    $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.IntArray
+    VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:index index:0 type:kotlin.Int
+    VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:value index:1 type:kotlin.Int
+  FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+    overridden:
+      public open fun toString (): kotlin.String declared in kotlin.Any
+      public open fun toString (): kotlin.String [fake_override] declared in kotlin.Cloneable
+    $this: VALUE_PARAMETER FAKE_OVERRIDE name:<this> type:kotlin.Any

compiler/testData/ir/irText/stubs/arraysFromBuiltins.__kotlin.collections.IntIterator.fir.ir.txt

@@ -0,0 +1,26 @@
+CLASS IR_EXTERNAL_DECLARATION_STUB CLASS name:IntIterator modality:ABSTRACT visibility:public superTypes:[kotlin.collections.Iterator<kotlin.Int>]
+  $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:kotlin.collections.IntIterator
+  CONSTRUCTOR IR_EXTERNAL_DECLARATION_STUB visibility:public <> () returnType:kotlin.collections.IntIterator [primary]
+  FUN IR_EXTERNAL_DECLARATION_STUB name:next visibility:public modality:FINAL <> ($this:kotlin.collections.IntIterator) returnType:kotlin.Int [operator]
+    overridden:
+      public abstract fun next (): T of kotlin.collections.Iterator [operator] declared in kotlin.collections.Iterator
+    $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.collections.IntIterator
+  FUN IR_EXTERNAL_DECLARATION_STUB name:nextInt visibility:public modality:ABSTRACT <> ($this:kotlin.collections.IntIterator) returnType:kotlin.Int
+    $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.collections.IntIterator
+  FUN FAKE_OVERRIDE name:hasNext visibility:public modality:ABSTRACT <> ($this:kotlin.collections.IntIterator) returnType:kotlin.Boolean [fake_override,operator]
+    overridden:
+      public abstract fun hasNext (): kotlin.Boolean [operator] declared in kotlin.collections.Iterator
+    $this: VALUE_PARAMETER FAKE_OVERRIDE name:<this> type:kotlin.collections.IntIterator
+  FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.collections.IntIterator, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+    overridden:
+      public open fun equals (other: kotlin.Any?): kotlin.Boolean [fake_override,operator] declared in kotlin.collections.Iterator
+    $this: VALUE_PARAMETER FAKE_OVERRIDE name:<this> type:kotlin.collections.IntIterator
+    VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+  FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.collections.IntIterator) returnType:kotlin.Int [fake_override]
+    overridden:
+      public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.collections.Iterator
+    $this: VALUE_PARAMETER FAKE_OVERRIDE name:<this> type:kotlin.collections.IntIterator
+  FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.collections.IntIterator) returnType:kotlin.String [fake_override]
+    overridden:
+      public open fun toString (): kotlin.String [fake_override] declared in kotlin.collections.Iterator
+    $this: VALUE_PARAMETER FAKE_OVERRIDE name:<this> type:kotlin.collections.IntIterator

compiler/testData/ir/irText/stubs/arraysFromBuiltins.__kotlin.collections.IntIterator.ir.txt

@@ -0,0 +1,26 @@
+CLASS IR_EXTERNAL_DECLARATION_STUB CLASS name:IntIterator modality:ABSTRACT visibility:public superTypes:[kotlin.collections.Iterator<kotlin.Int>]
+  $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.collections.IntIterator
+  CONSTRUCTOR IR_EXTERNAL_DECLARATION_STUB visibility:public <> () returnType:kotlin.collections.IntIterator [primary]
+  FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($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 kotlin.collections.Iterator
+    $this: VALUE_PARAMETER FAKE_OVERRIDE name:<this> type:kotlin.Any
+    VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:other index:0 type:kotlin.Any?
+  FUN FAKE_OVERRIDE name:hasNext visibility:public modality:ABSTRACT <> ($this:kotlin.collections.Iterator<kotlin.Int>) returnType:kotlin.Boolean [fake_override,operator]
+    overridden:
+      public abstract fun hasNext (): kotlin.Boolean [operator] declared in kotlin.collections.Iterator
+    $this: VALUE_PARAMETER FAKE_OVERRIDE name:<this> type:kotlin.collections.Iterator<kotlin.Int>
+  FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+    overridden:
+      public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.collections.Iterator
+    $this: VALUE_PARAMETER FAKE_OVERRIDE name:<this> type:kotlin.Any
+  FUN IR_EXTERNAL_DECLARATION_STUB name:next visibility:public modality:FINAL <> ($this:kotlin.collections.IntIterator) returnType:kotlin.Int [operator]
+    overridden:
+      public abstract fun next (): T of kotlin.collections.Iterator [operator] declared in kotlin.collections.Iterator
+    $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.collections.IntIterator
+  FUN IR_EXTERNAL_DECLARATION_STUB name:nextInt visibility:public modality:ABSTRACT <> ($this:kotlin.collections.IntIterator) returnType:kotlin.Int
+    $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.collections.IntIterator
+  FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+    overridden:
+      public open fun toString (): kotlin.String [fake_override] declared in kotlin.collections.Iterator
+    $this: VALUE_PARAMETER FAKE_OVERRIDE name:<this> type:kotlin.Any

compiler/testData/ir/irText/stubs/arraysFromBuiltins.ir.txt

@@ -0,0 +1,12 @@
+FILE fqName:<root> fileName:/arraysFromBuiltins.kt
+  PROPERTY name:test visibility:public modality:FINAL [val]
+    FIELD PROPERTY_BACKING_FIELD name:test type:kotlin.collections.IntIterator visibility:private [final,static]
+      EXPRESSION_BODY
+        CALL 'public final fun iterator (): kotlin.collections.IntIterator [operator] declared in kotlin.IntArray' type=kotlin.collections.IntIterator origin=null
+          $this: CONSTRUCTOR_CALL 'public constructor <init> (size: kotlin.Int) [primary] declared in kotlin.IntArray' type=kotlin.IntArray origin=null
+            size: CONST Int type=kotlin.Int value=1
+    FUN DEFAULT_PROPERTY_ACCESSOR name:<get-test> visibility:public modality:FINAL <> () returnType:kotlin.collections.IntIterator
+      correspondingProperty: PROPERTY name:test visibility:public modality:FINAL [val]
+      BLOCK_BODY
+        RETURN type=kotlin.Nothing from='public final fun <get-test> (): kotlin.collections.IntIterator declared in <root>'
+          GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:test type:kotlin.collections.IntIterator visibility:private [final,static]' type=kotlin.collections.IntIterator origin=null

compiler/testData/ir/irText/stubs/arraysFromBuiltins.kt

@@ -0,0 +1,7 @@
+// FIR_IDENTICAL
+// DUMP_EXTERNAL_CLASS: kotlin/Array
+// DUMP_EXTERNAL_CLASS: kotlin/IntArray
+// DUMP_EXTERNAL_CLASS: kotlin/collections/IntIterator
+// TARGET_BACKEND: JVM_IR
+
+val test = IntArray(1).iterator()

compiler/testData/ir/irText/stubs/arraysFromBuiltins.kt.txt

@@ -0,0 +1,3 @@
+val test: IntIterator
+  field = IntArray(size = 1).iterator()
+  get

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/ir/ClassicJvmIrTextTestGenerated.java

@@ -3102,6 +3102,12 @@ public class ClassicJvmIrTextTestGenerated extends AbstractClassicJvmIrTextTest
             KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/ir/irText/stubs"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.JVM_IR, true);
         }
 
+        @Test
+        @TestMetadata("arraysFromBuiltins.kt")
+        public void testArraysFromBuiltins() throws Exception {
+            runTest("compiler/testData/ir/irText/stubs/arraysFromBuiltins.kt");
+        }
+
         @Test
         @TestMetadata("builtinMap.kt")
         public void testBuiltinMap() throws Exception {