PSI2IR KT-47939 callable references to fun interface constructors

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/ir/Fir2IrTextTestGenerated.java

@@ -1394,6 +1394,12 @@ public class Fir2IrTextTestGenerated extends AbstractFir2IrTextTest {
             runTest("compiler/testData/ir/irText/expressions/funImportedFromObject.kt");
         }
 
+        @Test
+        @TestMetadata("funInterfaceConstructorReference.kt")
+        public void testFunInterfaceConstructorReference() throws Exception {
+            runTest("compiler/testData/ir/irText/expressions/funInterfaceConstructorReference.kt");
+        }
+
         @Test
         @TestMetadata("genericConstructorCallWithTypeArguments.kt")
         public void testGenericConstructorCallWithTypeArguments() throws Exception {

compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/ReflectionReferencesGenerator.kt

@@ -18,8 +18,12 @@ package org.jetbrains.kotlin.psi2ir.generators
 
 import org.jetbrains.kotlin.builtins.*
 import org.jetbrains.kotlin.descriptors.*
+import org.jetbrains.kotlin.descriptors.synthetic.FunctionInterfaceConstructorDescriptor
 import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
-import org.jetbrains.kotlin.ir.declarations.*
+import org.jetbrains.kotlin.ir.declarations.DescriptorMetadataSource
+import org.jetbrains.kotlin.ir.declarations.IrDeclarationOrigin
+import org.jetbrains.kotlin.ir.declarations.IrSimpleFunction
+import org.jetbrains.kotlin.ir.declarations.IrValueParameter
 import org.jetbrains.kotlin.ir.descriptors.IrBuiltInsOverDescriptors
 import org.jetbrains.kotlin.ir.expressions.*
 import org.jetbrains.kotlin.ir.expressions.impl.*
@@ -67,32 +71,122 @@ class ReflectionReferencesGenerator(statementGenerator: StatementGenerator) : St
     fun generateCallableReference(ktCallableReference: KtCallableReferenceExpression): IrExpression {
         val resolvedCall = getResolvedCall(ktCallableReference.callableReference)!!
         val resolvedDescriptor = resolvedCall.resultingDescriptor
-
+        val callableReferenceType = getTypeInferredByFrontendOrFail(ktCallableReference)
         val callBuilder = unwrapCallableDescriptorAndTypeArguments(resolvedCall)
 
-        val callableReferenceType = getTypeInferredByFrontendOrFail(ktCallableReference)
+        return when {
-        if (resolvedCall.valueArguments.isNotEmpty() ||
+            resolvedDescriptor is FunctionInterfaceConstructorDescriptor ||
+                    resolvedDescriptor.original is FunctionInterfaceConstructorDescriptor ->
+                generateFunctionInterfaceConstructorReference(
+                    ktCallableReference, callableReferenceType, callBuilder.descriptor
+                )
+
+            isAdaptedCallableReference(resolvedCall, resolvedDescriptor, callableReferenceType) ->
+                generateAdaptedCallableReference(ktCallableReference, callBuilder, callableReferenceType)
+
+            else ->
+                statementGenerator.generateCallReceiver(
+                    ktCallableReference,
+                    resolvedDescriptor,
+                    resolvedCall.dispatchReceiver, resolvedCall.extensionReceiver,resolvedCall.contextReceivers,
+                    isSafe = false
+                ).call { dispatchReceiverValue, extensionReceiverValue, _ ->
+                    generateCallableReference(
+                        ktCallableReference,
+                        callableReferenceType,
+                        callBuilder.descriptor,
+                        callBuilder.typeArguments
+                    ).also { irCallableReference ->
+                        irCallableReference.dispatchReceiver = dispatchReceiverValue?.loadIfExists()
+                        irCallableReference.extensionReceiver = extensionReceiverValue?.loadIfExists()
+                    }
+                }
+        }
+    }
+
+    private fun isAdaptedCallableReference(
+        resolvedCall: ResolvedCall<out CallableDescriptor>,
+        resolvedDescriptor: CallableDescriptor,
+        callableReferenceType: KotlinType
+    ) = resolvedCall.valueArguments.isNotEmpty() ||
             requiresCoercionToUnit(resolvedDescriptor, callableReferenceType) ||
             requiresSuspendConversion(resolvedDescriptor, callableReferenceType)
-        ) {
-            return generateAdaptedCallableReference(ktCallableReference, callBuilder, callableReferenceType)
-        }
 
-        return statementGenerator.generateCallReceiver(
+    private fun generateFunctionInterfaceConstructorReference(
-            ktCallableReference,
+        ktCallableReference: KtCallableReferenceExpression,
-            resolvedDescriptor, resolvedCall.dispatchReceiver,
+        callableReferenceType: KotlinType,
-            resolvedCall.extensionReceiver,
+        descriptor: CallableDescriptor
-            resolvedCall.contextReceivers,
+    ): IrExpression {
-            isSafe = false
+        //  {
-        ).call { dispatchReceiverValue, extensionReceiverValue, _ ->
+        //      fun <ADAPTER_FUN>(function: <FUN_TYPE>): <FUN_INTERFACE_TYPE> =
-            generateCallableReference(
+        //          <FUN_INTERFACE_TYPE>(function)
-                ktCallableReference,
+        //      ::<ADAPTER_FUN>
-                callableReferenceType,
+        //  }
-                callBuilder.descriptor,
+        val startOffset = ktCallableReference.startOffsetSkippingComments
-                callBuilder.typeArguments
+        val endOffset = ktCallableReference.endOffset
-            ).also { irCallableReference ->
+
-                irCallableReference.dispatchReceiver = dispatchReceiverValue?.loadIfExists()
+        val irReferenceType = callableReferenceType.toIrType()
-                irCallableReference.extensionReceiver = extensionReceiverValue?.loadIfExists()
+
+        val irAdapterFun = createFunInterfaceConstructorAdapter(startOffset, endOffset, descriptor)
+
+        val irAdapterRef = IrFunctionReferenceImpl(
+            startOffset, endOffset,
+            type = irReferenceType,
+            symbol = irAdapterFun.symbol,
+            typeArgumentsCount = irAdapterFun.typeParameters.size,
+            valueArgumentsCount = irAdapterFun.valueParameters.size,
+            reflectionTarget = irAdapterFun.symbol,
+            origin = IrStatementOrigin.FUN_INTERFACE_CONSTRUCTOR_REFERENCE
+        )
+
+        return IrBlockImpl(
+            startOffset, endOffset,
+            irReferenceType,
+            IrStatementOrigin.FUN_INTERFACE_CONSTRUCTOR_REFERENCE,
+            listOf(
+                irAdapterFun,
+                irAdapterRef
+            )
+        )
+    }
+
+    private fun createFunInterfaceConstructorAdapter(startOffset: Int, endOffset: Int, descriptor: CallableDescriptor): IrSimpleFunction {
+        val samType = descriptor.returnType
+            ?: throw AssertionError("Unresolved return type: $descriptor")
+        val samClassDescriptor = samType.constructor.declarationDescriptor as? ClassDescriptor
+            ?: throw AssertionError("Class type expected: $samType")
+        val irSamType = samType.toIrType()
+
+        val functionParameter = descriptor.valueParameters.singleOrNull()
+            ?: throw AssertionError("Single value parameter expected: $descriptor")
+
+        return context.irFactory.createFunction(
+            startOffset, endOffset,
+            IrDeclarationOrigin.ADAPTER_FOR_FUN_INTERFACE_CONSTRUCTOR,
+            IrSimpleFunctionSymbolImpl(),
+            name = samClassDescriptor.name,
+            visibility = DescriptorVisibilities.LOCAL,
+            modality = Modality.FINAL,
+            returnType = irSamType,
+            isInline = false, isExternal = false, isTailrec = false, isSuspend = false, isOperator = false, isInfix = false,
+            isExpect = false, isFakeOverride = false
+        ).also { irAdapterFun ->
+            context.symbolTable.withScope(irAdapterFun) {
+                // TODO irAdapterFun.metadata = ...?
+                irAdapterFun.dispatchReceiverParameter = null
+                irAdapterFun.extensionReceiverParameter = null
+
+                val irFnParameter = createAdapterParameter(startOffset, endOffset, functionParameter.name, 0, functionParameter.type)
+                irAdapterFun.valueParameters = listOf(irFnParameter)
+                irAdapterFun.body =
+                    context.irFactory.createExpressionBody(
+                        startOffset, endOffset,
+                        IrTypeOperatorCallImpl(
+                            startOffset, endOffset,
+                            irSamType, IrTypeOperator.SAM_CONVERSION, irSamType,
+                            IrGetValueImpl(startOffset, endOffset, irFnParameter.symbol)
+                        )
+                    )
             }
         }
     }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/IrDeclarationOrigin.kt

@@ -16,6 +16,8 @@
 
 package org.jetbrains.kotlin.ir.declarations
 
+import org.jetbrains.kotlin.ir.expressions.IrStatementOriginImpl
+
 interface IrDeclarationOrigin {
     object DEFINED : IrDeclarationOriginImpl("DEFINED")
     object FAKE_OVERRIDE : IrDeclarationOriginImpl("FAKE_OVERRIDE")
@@ -75,6 +77,7 @@ interface IrDeclarationOrigin {
     object ADAPTER_PARAMETER_FOR_CALLABLE_REFERENCE : IrDeclarationOriginImpl("ADAPTER_PARAMETER_FOR_CALLABLE_REFERENCE")
     object ADAPTER_FOR_SUSPEND_CONVERSION : IrDeclarationOriginImpl("ADAPTER_FOR_SUSPEND_CONVERSION", isSynthetic = true)
     object ADAPTER_PARAMETER_FOR_SUSPEND_CONVERSION : IrDeclarationOriginImpl("ADAPTER_PARAMETER_FOR_SUSPEND_CONVERSION")
+    object ADAPTER_FOR_FUN_INTERFACE_CONSTRUCTOR : IrDeclarationOriginImpl("ADAPTER_FOR_FUN_INTERFACE_CONSTRUCTOR", isSynthetic = true)
 
     object GENERATED_SAM_IMPLEMENTATION : IrDeclarationOriginImpl("GENERATED_SAM_IMPLEMENTATION")
     object SYNTHETIC_GENERATED_SAM_IMPLEMENTATION : IrDeclarationOriginImpl("SYNTHETIC_GENERATED_SAM_IMPLEMENTATION", isSynthetic = true)

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/expressions/IrStatementOrigin.kt

@@ -90,7 +90,8 @@ interface IrStatementOrigin {
     object ANONYMOUS_FUNCTION : IrStatementOriginImpl("ANONYMOUS_FUNCTION")
     object OBJECT_LITERAL : IrStatementOriginImpl("OBJECT_LITERAL")
     object ADAPTED_FUNCTION_REFERENCE : IrStatementOriginImpl("ADAPTED_FUNCTION_REFERENCE")
-    object SUSPEND_CONVERSION: IrStatementOriginImpl("SUSPEND_CONVERSION")
+    object SUSPEND_CONVERSION : IrStatementOriginImpl("SUSPEND_CONVERSION")
+    object FUN_INTERFACE_CONSTRUCTOR_REFERENCE : IrStatementOriginImpl("FUN_INTERFACE_CONSTRUCTOR_REFERENCE")
 
     object INITIALIZE_PROPERTY_FROM_PARAMETER : IrStatementOriginImpl("INITIALIZE_PROPERTY_FROM_PARAMETER")
     object INITIALIZE_FIELD : IrStatementOriginImpl("INITIALIZE_FIELD")

compiler/testData/ir/irText/expressions/funInterfaceConstructorReference.ir.txt

@@ -0,0 +1,128 @@
+FILE fqName:<root> fileName:/funInterfaceConstructorReference.kt
+  CLASS INTERFACE name:KRunnable modality:ABSTRACT visibility:public [fun] superTypes:[kotlin.Any]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.KRunnable
+    FUN name:run visibility:public modality:ABSTRACT <> ($this:<root>.KRunnable) returnType:kotlin.Unit
+      $this: VALUE_PARAMETER name:<this> type:<root>.KRunnable
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($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
+  TYPEALIAS name:KR visibility:public expandedType:<root>.KRunnable
+  CLASS INTERFACE name:KSupplier modality:ABSTRACT visibility:public [fun] superTypes:[kotlin.Any]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.KSupplier<T of <root>.KSupplier>
+    TYPE_PARAMETER name:T index:0 variance: superTypes:[kotlin.Any?]
+    FUN name:get visibility:public modality:ABSTRACT <> ($this:<root>.KSupplier<T of <root>.KSupplier>) returnType:T of <root>.KSupplier
+      $this: VALUE_PARAMETER name:<this> type:<root>.KSupplier<T of <root>.KSupplier>
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($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
+  TYPEALIAS name:KSS visibility:public expandedType:<root>.KSupplier<kotlin.String>
+  CLASS INTERFACE name:KConsumer modality:ABSTRACT visibility:public [fun] superTypes:[kotlin.Any]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.KConsumer<T of <root>.KConsumer>
+    TYPE_PARAMETER name:T index:0 variance: superTypes:[kotlin.Any?]
+    FUN name:accept visibility:public modality:ABSTRACT <> ($this:<root>.KConsumer<T of <root>.KConsumer>, x:T of <root>.KConsumer) returnType:kotlin.Unit
+      $this: VALUE_PARAMETER name:<this> type:<root>.KConsumer<T of <root>.KConsumer>
+      VALUE_PARAMETER name:x index:0 type:T of <root>.KConsumer
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($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
+  TYPEALIAS name:KCS visibility:public expandedType:<root>.KConsumer<kotlin.String>
+  FUN name:test1 visibility:public modality:FINAL <> () returnType:kotlin.reflect.KFunction1<@[ParameterName(name = 'function')] kotlin.Function0<kotlin.Unit>, <root>.KRunnable>
+    BLOCK_BODY
+      RETURN type=kotlin.Nothing from='public final fun test1 (): kotlin.reflect.KFunction1<@[ParameterName(name = 'function')] kotlin.Function0<kotlin.Unit>, <root>.KRunnable> declared in <root>'
+        BLOCK type=kotlin.reflect.KFunction1<@[ParameterName(name = 'function')] kotlin.Function0<kotlin.Unit>, <root>.KRunnable> origin=FUN_INTERFACE_CONSTRUCTOR_REFERENCE
+          FUN ADAPTER_FOR_FUN_INTERFACE_CONSTRUCTOR name:KRunnable visibility:local modality:FINAL <> (function:kotlin.Function0<kotlin.Unit>) returnType:<root>.KRunnable
+            VALUE_PARAMETER ADAPTER_PARAMETER_FOR_CALLABLE_REFERENCE name:function index:0 type:kotlin.Function0<kotlin.Unit>
+            EXPRESSION_BODY
+              TYPE_OP type=<root>.KRunnable origin=SAM_CONVERSION typeOperand=<root>.KRunnable
+                GET_VAR 'function: kotlin.Function0<kotlin.Unit> declared in <root>.test1.KRunnable' type=kotlin.Function0<kotlin.Unit> origin=null
+          FUNCTION_REFERENCE 'local final fun KRunnable (function: kotlin.Function0<kotlin.Unit>): <root>.KRunnable declared in <root>.test1' type=kotlin.reflect.KFunction1<@[ParameterName(name = 'function')] kotlin.Function0<kotlin.Unit>, <root>.KRunnable> origin=FUN_INTERFACE_CONSTRUCTOR_REFERENCE reflectionTarget=<same>
+  FUN name:test1a visibility:public modality:FINAL <> () returnType:kotlin.reflect.KFunction1<@[ParameterName(name = 'function')] kotlin.Function0<kotlin.Unit>, <root>.KRunnable>
+    BLOCK_BODY
+      RETURN type=kotlin.Nothing from='public final fun test1a (): kotlin.reflect.KFunction1<@[ParameterName(name = 'function')] kotlin.Function0<kotlin.Unit>, <root>.KRunnable> declared in <root>'
+        BLOCK type=kotlin.reflect.KFunction1<@[ParameterName(name = 'function')] kotlin.Function0<kotlin.Unit>, <root>.KRunnable> origin=FUN_INTERFACE_CONSTRUCTOR_REFERENCE
+          FUN ADAPTER_FOR_FUN_INTERFACE_CONSTRUCTOR name:KRunnable visibility:local modality:FINAL <> (function:kotlin.Function0<kotlin.Unit>) returnType:<root>.KRunnable
+            VALUE_PARAMETER ADAPTER_PARAMETER_FOR_CALLABLE_REFERENCE name:function index:0 type:kotlin.Function0<kotlin.Unit>
+            EXPRESSION_BODY
+              TYPE_OP type=<root>.KRunnable origin=SAM_CONVERSION typeOperand=<root>.KRunnable
+                GET_VAR 'function: kotlin.Function0<kotlin.Unit> declared in <root>.test1a.KRunnable' type=kotlin.Function0<kotlin.Unit> origin=null
+          FUNCTION_REFERENCE 'local final fun KRunnable (function: kotlin.Function0<kotlin.Unit>): <root>.KRunnable declared in <root>.test1a' type=kotlin.reflect.KFunction1<@[ParameterName(name = 'function')] kotlin.Function0<kotlin.Unit>, <root>.KRunnable> origin=FUN_INTERFACE_CONSTRUCTOR_REFERENCE reflectionTarget=<same>
+  FUN name:test1b visibility:public modality:FINAL <> () returnType:kotlin.reflect.KFunction<java.lang.Runnable>
+    BLOCK_BODY
+      RETURN type=kotlin.Nothing from='public final fun test1b (): kotlin.reflect.KFunction<java.lang.Runnable> declared in <root>'
+        BLOCK type=kotlin.reflect.KFunction1<@[ParameterName(name = 'function')] kotlin.Function0<kotlin.Unit>, java.lang.Runnable> origin=FUN_INTERFACE_CONSTRUCTOR_REFERENCE
+          FUN ADAPTER_FOR_FUN_INTERFACE_CONSTRUCTOR name:Runnable visibility:local modality:FINAL <> (function:kotlin.Function0<kotlin.Unit>) returnType:java.lang.Runnable
+            VALUE_PARAMETER ADAPTER_PARAMETER_FOR_CALLABLE_REFERENCE name:function index:0 type:kotlin.Function0<kotlin.Unit>
+            EXPRESSION_BODY
+              TYPE_OP type=java.lang.Runnable origin=SAM_CONVERSION typeOperand=java.lang.Runnable
+                GET_VAR 'function: kotlin.Function0<kotlin.Unit> declared in <root>.test1b.Runnable' type=kotlin.Function0<kotlin.Unit> origin=null
+          FUNCTION_REFERENCE 'local final fun Runnable (function: kotlin.Function0<kotlin.Unit>): java.lang.Runnable declared in <root>.test1b' type=kotlin.reflect.KFunction1<@[ParameterName(name = 'function')] kotlin.Function0<kotlin.Unit>, java.lang.Runnable> origin=FUN_INTERFACE_CONSTRUCTOR_REFERENCE reflectionTarget=<same>
+  FUN name:test2 visibility:public modality:FINAL <> () returnType:kotlin.Function1<kotlin.Function0<kotlin.String>, <root>.KSupplier<kotlin.String>>
+    BLOCK_BODY
+      RETURN type=kotlin.Nothing from='public final fun test2 (): kotlin.Function1<kotlin.Function0<kotlin.String>, <root>.KSupplier<kotlin.String>> declared in <root>'
+        BLOCK type=kotlin.reflect.KFunction1<@[ParameterName(name = 'function')] kotlin.Function0<kotlin.String>, <root>.KSupplier<kotlin.String>> origin=FUN_INTERFACE_CONSTRUCTOR_REFERENCE
+          FUN ADAPTER_FOR_FUN_INTERFACE_CONSTRUCTOR name:KSupplier visibility:local modality:FINAL <> (function:kotlin.Function0<kotlin.String>) returnType:<root>.KSupplier<kotlin.String>
+            VALUE_PARAMETER ADAPTER_PARAMETER_FOR_CALLABLE_REFERENCE name:function index:0 type:kotlin.Function0<kotlin.String>
+            EXPRESSION_BODY
+              TYPE_OP type=<root>.KSupplier<kotlin.String> origin=SAM_CONVERSION typeOperand=<root>.KSupplier<kotlin.String>
+                GET_VAR 'function: kotlin.Function0<kotlin.String> declared in <root>.test2.KSupplier' type=kotlin.Function0<kotlin.String> origin=null
+          FUNCTION_REFERENCE 'local final fun KSupplier (function: kotlin.Function0<kotlin.String>): <root>.KSupplier<kotlin.String> declared in <root>.test2' type=kotlin.reflect.KFunction1<@[ParameterName(name = 'function')] kotlin.Function0<kotlin.String>, <root>.KSupplier<kotlin.String>> origin=FUN_INTERFACE_CONSTRUCTOR_REFERENCE reflectionTarget=<same>
+  FUN name:test2a visibility:public modality:FINAL <> () returnType:kotlin.Function1<kotlin.Function0<kotlin.String>, <root>.KSupplier<kotlin.String>>
+    BLOCK_BODY
+      RETURN type=kotlin.Nothing from='public final fun test2a (): kotlin.Function1<kotlin.Function0<kotlin.String>, <root>.KSupplier<kotlin.String>> declared in <root>'
+        BLOCK type=kotlin.reflect.KFunction1<@[ParameterName(name = 'function')] kotlin.Function0<kotlin.String>, <root>.KSupplier<kotlin.String>> origin=FUN_INTERFACE_CONSTRUCTOR_REFERENCE
+          FUN ADAPTER_FOR_FUN_INTERFACE_CONSTRUCTOR name:KSupplier visibility:local modality:FINAL <> (function:kotlin.Function0<kotlin.String>) returnType:<root>.KSupplier<kotlin.String>
+            VALUE_PARAMETER ADAPTER_PARAMETER_FOR_CALLABLE_REFERENCE name:function index:0 type:kotlin.Function0<kotlin.String>
+            EXPRESSION_BODY
+              TYPE_OP type=<root>.KSupplier<kotlin.String> origin=SAM_CONVERSION typeOperand=<root>.KSupplier<kotlin.String>
+                GET_VAR 'function: kotlin.Function0<kotlin.String> declared in <root>.test2a.KSupplier' type=kotlin.Function0<kotlin.String> origin=null
+          FUNCTION_REFERENCE 'local final fun KSupplier (function: kotlin.Function0<kotlin.String>): <root>.KSupplier<kotlin.String> declared in <root>.test2a' type=kotlin.reflect.KFunction1<@[ParameterName(name = 'function')] kotlin.Function0<kotlin.String>, <root>.KSupplier<kotlin.String>> origin=FUN_INTERFACE_CONSTRUCTOR_REFERENCE reflectionTarget=<same>
+  FUN name:test3 visibility:public modality:FINAL <> () returnType:kotlin.Function1<kotlin.Function1<kotlin.String, kotlin.Unit>, <root>.KConsumer<kotlin.String>>
+    BLOCK_BODY
+      RETURN type=kotlin.Nothing from='public final fun test3 (): kotlin.Function1<kotlin.Function1<kotlin.String, kotlin.Unit>, <root>.KConsumer<kotlin.String>> declared in <root>'
+        BLOCK type=kotlin.reflect.KFunction1<@[ParameterName(name = 'function')] kotlin.Function1<@[ParameterName(name = 'x')] kotlin.String, kotlin.Unit>, <root>.KConsumer<kotlin.String>> origin=FUN_INTERFACE_CONSTRUCTOR_REFERENCE
+          FUN ADAPTER_FOR_FUN_INTERFACE_CONSTRUCTOR name:KConsumer visibility:local modality:FINAL <> (function:kotlin.Function1<@[ParameterName(name = 'x')] kotlin.String, kotlin.Unit>) returnType:<root>.KConsumer<kotlin.String>
+            VALUE_PARAMETER ADAPTER_PARAMETER_FOR_CALLABLE_REFERENCE name:function index:0 type:kotlin.Function1<@[ParameterName(name = 'x')] kotlin.String, kotlin.Unit>
+            EXPRESSION_BODY
+              TYPE_OP type=<root>.KConsumer<kotlin.String> origin=SAM_CONVERSION typeOperand=<root>.KConsumer<kotlin.String>
+                GET_VAR 'function: kotlin.Function1<@[ParameterName(name = 'x')] kotlin.String, kotlin.Unit> declared in <root>.test3.KConsumer' type=kotlin.Function1<@[ParameterName(name = 'x')] kotlin.String, kotlin.Unit> origin=null
+          FUNCTION_REFERENCE 'local final fun KConsumer (function: kotlin.Function1<@[ParameterName(name = 'x')] kotlin.String, kotlin.Unit>): <root>.KConsumer<kotlin.String> declared in <root>.test3' type=kotlin.reflect.KFunction1<@[ParameterName(name = 'function')] kotlin.Function1<@[ParameterName(name = 'x')] kotlin.String, kotlin.Unit>, <root>.KConsumer<kotlin.String>> origin=FUN_INTERFACE_CONSTRUCTOR_REFERENCE reflectionTarget=<same>
+  FUN name:test3a visibility:public modality:FINAL <> () returnType:kotlin.Function1<kotlin.Function1<kotlin.String, kotlin.Unit>, <root>.KConsumer<kotlin.String>>
+    BLOCK_BODY
+      RETURN type=kotlin.Nothing from='public final fun test3a (): kotlin.Function1<kotlin.Function1<kotlin.String, kotlin.Unit>, <root>.KConsumer<kotlin.String>> declared in <root>'
+        BLOCK type=kotlin.reflect.KFunction1<@[ParameterName(name = 'function')] kotlin.Function1<@[ParameterName(name = 'x')] kotlin.String, kotlin.Unit>, <root>.KConsumer<kotlin.String>> origin=FUN_INTERFACE_CONSTRUCTOR_REFERENCE
+          FUN ADAPTER_FOR_FUN_INTERFACE_CONSTRUCTOR name:KConsumer visibility:local modality:FINAL <> (function:kotlin.Function1<@[ParameterName(name = 'x')] kotlin.String, kotlin.Unit>) returnType:<root>.KConsumer<kotlin.String>
+            VALUE_PARAMETER ADAPTER_PARAMETER_FOR_CALLABLE_REFERENCE name:function index:0 type:kotlin.Function1<@[ParameterName(name = 'x')] kotlin.String, kotlin.Unit>
+            EXPRESSION_BODY
+              TYPE_OP type=<root>.KConsumer<kotlin.String> origin=SAM_CONVERSION typeOperand=<root>.KConsumer<kotlin.String>
+                GET_VAR 'function: kotlin.Function1<@[ParameterName(name = 'x')] kotlin.String, kotlin.Unit> declared in <root>.test3a.KConsumer' type=kotlin.Function1<@[ParameterName(name = 'x')] kotlin.String, kotlin.Unit> origin=null
+          FUNCTION_REFERENCE 'local final fun KConsumer (function: kotlin.Function1<@[ParameterName(name = 'x')] kotlin.String, kotlin.Unit>): <root>.KConsumer<kotlin.String> declared in <root>.test3a' type=kotlin.reflect.KFunction1<@[ParameterName(name = 'function')] kotlin.Function1<@[ParameterName(name = 'x')] kotlin.String, kotlin.Unit>, <root>.KConsumer<kotlin.String>> origin=FUN_INTERFACE_CONSTRUCTOR_REFERENCE reflectionTarget=<same>

compiler/testData/ir/irText/expressions/funInterfaceConstructorReference.kt

@@ -0,0 +1,36 @@
+// !LANGUAGE: +AllowKotlinFunInterfaceConstructorReference
+// WITH_REFLECT
+import kotlin.reflect.*
+
+fun interface KRunnable {
+    fun run()
+}
+
+typealias KR = KRunnable
+
+fun interface KSupplier<T> {
+    fun get(): T
+}
+
+typealias KSS = KSupplier<String>
+
+fun interface KConsumer<T> {
+    fun accept(x: T)
+}
+
+typealias KCS = KConsumer<String>
+
+fun test1() = ::KRunnable
+
+fun test1a() = ::KR
+
+fun test1b(): KFunction<Runnable> = ::Runnable
+
+fun test2(): (() -> String) -> KSupplier<String> = ::KSupplier
+
+fun test2a(): (() -> String) -> KSupplier<String> = ::KSS
+
+fun test3(): ((String) -> Unit) -> KConsumer<String> = ::KConsumer
+
+fun test3a(): ((String) -> Unit) -> KConsumer<String> = ::KCS
+

compiler/testData/ir/irText/expressions/funInterfaceConstructorReference.kt.txt

@@ -0,0 +1,74 @@
+fun interface KRunnable {
+  abstract fun run()
+
+}
+
+typealias KR = KRunnable
+fun interface KSupplier<T : Any?> {
+  abstract fun get(): T
+
+}
+
+typealias KSS = KSupplier<String>
+fun interface KConsumer<T : Any?> {
+  abstract fun accept(x: T)
+
+}
+
+typealias KCS = KConsumer<String>
+fun test1(): KFunction1<@ParameterName(name = "function") Function0<Unit>, KRunnable> {
+  return { // BLOCK
+    local fun KRunnable(fn: Function0<Unit>): KRunnable fn /*-> KRunnable */
+
+    ::KRunnable
+  }
+}
+
+fun test1a(): KFunction1<@ParameterName(name = "function") Function0<Unit>, KRunnable> {
+  return { // BLOCK
+    local fun KRunnable(fn: Function0<Unit>): KRunnable fn /*-> KRunnable */
+
+    ::KRunnable
+  }
+}
+
+fun test1b(): KFunction<Runnable> {
+  return { // BLOCK
+    local fun Runnable(fn: Function0<Unit>): Runnable fn /*-> Runnable */
+
+    ::Runnable
+  }
+}
+
+fun test2(): Function1<Function0<String>, KSupplier<String>> {
+  return { // BLOCK
+    local fun KSupplier(fn: Function0<String>): KSupplier<String> fn /*-> KSupplier<String> */
+
+    ::KSupplier
+  }
+}
+
+fun test2a(): Function1<Function0<String>, KSupplier<String>> {
+  return { // BLOCK
+    local fun KSupplier(fn: Function0<String>): KSupplier<String> fn /*-> KSupplier<String> */
+
+    ::KSupplier
+  }
+}
+
+fun test3(): Function1<Function1<String, Unit>, KConsumer<String>> {
+  return { // BLOCK
+    local fun KConsumer(fn: Function1<@ParameterName(name = "x") String, Unit>): KConsumer<String> fn /*-> KConsumer<String> */
+
+    ::KConsumer
+  }
+}
+
+fun test3a(): Function1<Function1<String, Unit>, KConsumer<String>> {
+  return { // BLOCK
+    local fun KConsumer(fn: Function1<@ParameterName(name = "x") String, Unit>): KConsumer<String> fn /*-> KConsumer<String> */
+
+    ::KConsumer
+  }
+}
+

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

@@ -1394,6 +1394,12 @@ public class IrTextTestGenerated extends AbstractIrTextTest {
             runTest("compiler/testData/ir/irText/expressions/funImportedFromObject.kt");
         }
 
+        @Test
+        @TestMetadata("funInterfaceConstructorReference.kt")
+        public void testFunInterfaceConstructorReference() throws Exception {
+            runTest("compiler/testData/ir/irText/expressions/funInterfaceConstructorReference.kt");
+        }
+
         @Test
         @TestMetadata("genericConstructorCallWithTypeArguments.kt")
         public void testGenericConstructorCallWithTypeArguments() throws Exception {

compiler/tests-gen/org/jetbrains/kotlin/ir/KlibTextTestCaseGenerated.java

@@ -1077,6 +1077,11 @@ public class KlibTextTestCaseGenerated extends AbstractKlibTextTestCase {
             runTest("compiler/testData/ir/irText/expressions/funImportedFromObject.kt");
         }
 
+        @TestMetadata("funInterfaceConstructorReference.kt")
+        public void testFunInterfaceConstructorReference() throws Exception {
+            runTest("compiler/testData/ir/irText/expressions/funInterfaceConstructorReference.kt");
+        }
+
         @TestMetadata("genericConstructorCallWithTypeArguments.kt")
         public void testGenericConstructorCallWithTypeArguments() throws Exception {
             runTest("compiler/testData/ir/irText/expressions/genericConstructorCallWithTypeArguments.kt");