[Reflection] Use reference equality to determine that a callable reference is bound

It helps to avoid problems when receiver object implements structural equals violating the equality contract

#KT-60709

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirLightTreeBlackBoxCodegenTestGenerated.java

@@ -45162,6 +45162,12 @@ public class FirLightTreeBlackBoxCodegenTestGenerated extends AbstractFirLightTr
                 runTest("compiler/testData/codegen/box/reflection/callBy/jvmStaticInObject.kt");
             }
 
+            @Test
+            @TestMetadata("kt60709.kt")
+            public void testKt60709() throws Exception {
+                runTest("compiler/testData/codegen/box/reflection/callBy/kt60709.kt");
+            }
+
             @Test
             @TestMetadata("kt61304.kt")
             public void testKt61304() throws Exception {

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirLightTreeBlackBoxCodegenWithIrFakeOverrideGeneratorTestGenerated.java

@@ -45162,6 +45162,12 @@ public class FirLightTreeBlackBoxCodegenWithIrFakeOverrideGeneratorTestGenerated
                 runTest("compiler/testData/codegen/box/reflection/callBy/jvmStaticInObject.kt");
             }
 
+            @Test
+            @TestMetadata("kt60709.kt")
+            public void testKt60709() throws Exception {
+                runTest("compiler/testData/codegen/box/reflection/callBy/kt60709.kt");
+            }
+
             @Test
             @TestMetadata("kt61304.kt")
             public void testKt61304() throws Exception {

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirPsiBlackBoxCodegenTestGenerated.java

@@ -45162,6 +45162,12 @@ public class FirPsiBlackBoxCodegenTestGenerated extends AbstractFirPsiBlackBoxCo
                 runTest("compiler/testData/codegen/box/reflection/callBy/jvmStaticInObject.kt");
             }
 
+            @Test
+            @TestMetadata("kt60709.kt")
+            public void testKt60709() throws Exception {
+                runTest("compiler/testData/codegen/box/reflection/callBy/kt60709.kt");
+            }
+
             @Test
             @TestMetadata("kt61304.kt")
             public void testKt61304() throws Exception {

compiler/testData/codegen/box/reflection/callBy/kt60709.kt

@@ -0,0 +1,15 @@
+// TARGET_BACKEND: JVM
+
+// WITH_REFLECT
+
+class Eq {
+    override fun equals(other: Any?): Boolean = true
+    override fun toString(): String = "1"
+    val x: String get() = "2"
+}
+
+fun box(): String {
+    require(Eq()::toString.callBy(mapOf()) == "1")
+    require(Eq()::x.callBy(mapOf()) == "2")
+    return "OK"
+}

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/BlackBoxCodegenTestGenerated.java

@@ -42390,6 +42390,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
                 runTest("compiler/testData/codegen/box/reflection/callBy/jvmStaticInObject.kt");
             }
 
+            @Test
+            @TestMetadata("kt60709.kt")
+            public void testKt60709() throws Exception {
+                runTest("compiler/testData/codegen/box/reflection/callBy/kt60709.kt");
+            }
+
             @Test
             @TestMetadata("kt61304.kt")
             public void testKt61304() throws Exception {

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenTestGenerated.java

@@ -45162,6 +45162,12 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
                 runTest("compiler/testData/codegen/box/reflection/callBy/jvmStaticInObject.kt");
             }
 
+            @Test
+            @TestMetadata("kt60709.kt")
+            public void testKt60709() throws Exception {
+                runTest("compiler/testData/codegen/box/reflection/callBy/kt60709.kt");
+            }
+
             @Test
             @TestMetadata("kt61304.kt")
             public void testKt61304() throws Exception {

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenWithIrInlinerTestGenerated.java

@@ -45162,6 +45162,12 @@ public class IrBlackBoxCodegenWithIrInlinerTestGenerated extends AbstractIrBlack
                 runTest("compiler/testData/codegen/box/reflection/callBy/jvmStaticInObject.kt");
             }
 
+            @Test
+            @TestMetadata("kt60709.kt")
+            public void testKt60709() throws Exception {
+                runTest("compiler/testData/codegen/box/reflection/callBy/kt60709.kt");
+            }
+
             @Test
             @TestMetadata("kt61304.kt")
             public void testKt61304() throws Exception {

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

@@ -35884,6 +35884,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
                 runTest("compiler/testData/codegen/box/reflection/callBy/jvmStaticInObject.kt");
             }
 
+            @TestMetadata("kt60709.kt")
+            public void testKt60709() throws Exception {
+                runTest("compiler/testData/codegen/box/reflection/callBy/kt60709.kt");
+            }
+
             @TestMetadata("kt61304.kt")
             public void testKt61304() throws Exception {
                 runTest("compiler/testData/codegen/box/reflection/callBy/kt61304.kt");

core/reflection.jvm/src/kotlin/reflect/jvm/internal/KFunctionImpl.kt

@@ -53,7 +53,7 @@ internal class KFunctionImpl private constructor(
         descriptor
     )
 
-    override val isBound: Boolean get() = rawBoundReceiver != CallableReference.NO_RECEIVER
+    override val isBound: Boolean get() = rawBoundReceiver !== CallableReference.NO_RECEIVER
 
     override val descriptor: FunctionDescriptor by ReflectProperties.lazySoft(descriptorInitialValue) {
         container.findFunctionDescriptor(name, signature)

core/reflection.jvm/src/kotlin/reflect/jvm/internal/KPropertyImpl.kt

@@ -47,7 +47,7 @@ internal abstract class KPropertyImpl<out V> private constructor(
     val boundReceiver
         get() = rawBoundReceiver.coerceToExpectedReceiverType(descriptor)
 
-    override val isBound: Boolean get() = rawBoundReceiver != CallableReference.NO_RECEIVER
+    override val isBound: Boolean get() = rawBoundReceiver !== CallableReference.NO_RECEIVER
 
     private val _javaField = lazy(PUBLICATION) {
         when (val jvmSignature = RuntimeTypeMapper.mapPropertySignature(descriptor)) {