[NI] Approximate receivers for callable reference candidates

#KT-36221 Fixed

compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/tower/ResolvedAtomCompleter.kt

@@ -369,8 +369,10 @@ class ResolvedAtomCompleter(
     }
 
     private fun ReceiverValue.updateReceiverValue(substitutor: TypeSubstitutor): ReceiverValue {
-        val newType = substitutor.safeSubstitute(type, Variance.INVARIANT)
-        return if (type != newType) replaceType(newType) else this
+        val newType = substitutor.safeSubstitute(type, Variance.INVARIANT).let {
+            typeApproximator.approximateToSuperType(it, TypeApproximatorConfiguration.FinalApproximationAfterResolutionAndInference) ?: it
+        }
+        return if (type != newType) replaceType(newType as KotlinType) else this
     }
 
     private fun recordArgumentAdaptationForCallableReference(

compiler/testData/codegen/box/callableReference/bound/referenceToGetSetMethodsFromVararg.kt

@@ -0,0 +1,42 @@
+// !LANGUAGE: +NewInference
+// TARGET_BACKEND: JVM
+// IGNORE_BACKEND_FIR: JVM_IR
+// WITH_REFLECT
+
+import kotlin.test.assertEquals
+
+fun <T> bar0(vararg a: T) = test(a::get)
+fun <T> bar1(vararg a: T) = test(a::set)
+
+fun <T> bar2(a: Array<out T>) = test(a::get)
+fun <T> bar3(a: Array<out T>) = test(a::set)
+
+fun <T> bar4(a: Array<in T>) = test(a::get)
+fun <T> bar5(a: Array<in T>) = test(a::set)
+
+fun <F> test(f: F): String = f.toString()
+
+fun box(): String {
+    val getMethod = "fun kotlin.Array<T>.get(kotlin.Int): T"
+    val setMethod = "fun kotlin.Array<T>.set(kotlin.Int, T): kotlin.Unit"
+
+    val b0 = bar0("")
+    val b1 = bar1("")
+
+    assertEquals(getMethod, b0)
+    assertEquals(setMethod, b1)
+
+    val b2 = bar2(arrayOf(""))
+    val b3 = bar3(arrayOf(""))
+
+    assertEquals(getMethod, b2)
+    assertEquals(setMethod, b3)
+
+    val b4 = bar4(arrayOf(""))
+    val b5 = bar5(arrayOf(""))
+
+    assertEquals(getMethod, b4)
+    assertEquals(setMethod, b5)
+
+    return "OK"
+}

compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java

@@ -2082,6 +2082,11 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
                 runTest("compiler/testData/codegen/box/callableReference/bound/receiverEvaluatedOnce.kt");
             }
 
+            @TestMetadata("referenceToGetSetMethodsFromVararg.kt")
+            public void testReferenceToGetSetMethodsFromVararg() throws Exception {
+                runTest("compiler/testData/codegen/box/callableReference/bound/referenceToGetSetMethodsFromVararg.kt");
+            }
+
             @TestMetadata("simpleFunction.kt")
             public void testSimpleFunction() throws Exception {
                 runTest("compiler/testData/codegen/box/callableReference/bound/simpleFunction.kt");

compiler/tests/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java

@@ -2082,6 +2082,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
                 runTest("compiler/testData/codegen/box/callableReference/bound/receiverEvaluatedOnce.kt");
             }
 
+            @TestMetadata("referenceToGetSetMethodsFromVararg.kt")
+            public void testReferenceToGetSetMethodsFromVararg() throws Exception {
+                runTest("compiler/testData/codegen/box/callableReference/bound/referenceToGetSetMethodsFromVararg.kt");
+            }
+
             @TestMetadata("simpleFunction.kt")
             public void testSimpleFunction() throws Exception {
                 runTest("compiler/testData/codegen/box/callableReference/bound/simpleFunction.kt");

compiler/tests/org/jetbrains/kotlin/codegen/ir/FirBlackBoxCodegenTestGenerated.java

@@ -2062,6 +2062,11 @@ public class FirBlackBoxCodegenTestGenerated extends AbstractFirBlackBoxCodegenT
                 runTest("compiler/testData/codegen/box/callableReference/bound/receiverEvaluatedOnce.kt");
             }
 
+            @TestMetadata("referenceToGetSetMethodsFromVararg.kt")
+            public void testReferenceToGetSetMethodsFromVararg() throws Exception {
+                runTest("compiler/testData/codegen/box/callableReference/bound/referenceToGetSetMethodsFromVararg.kt");
+            }
+
             @TestMetadata("simpleFunction.kt")
             public void testSimpleFunction() throws Exception {
                 runTest("compiler/testData/codegen/box/callableReference/bound/simpleFunction.kt");

compiler/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java

@@ -2062,6 +2062,11 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
                 runTest("compiler/testData/codegen/box/callableReference/bound/receiverEvaluatedOnce.kt");
             }
 
+            @TestMetadata("referenceToGetSetMethodsFromVararg.kt")
+            public void testReferenceToGetSetMethodsFromVararg() throws Exception {
+                runTest("compiler/testData/codegen/box/callableReference/bound/referenceToGetSetMethodsFromVararg.kt");
+            }
+
             @TestMetadata("simpleFunction.kt")
             public void testSimpleFunction() throws Exception {
                 runTest("compiler/testData/codegen/box/callableReference/bound/simpleFunction.kt");