Use correct toString method in IrCompileTimeChecker for analysis

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

@@ -135,5 +135,11 @@ public class LoweredIrInterpreterTestGenerated extends AbstractLoweredIrInterpre
         public void testUnsignedConst() throws Exception {
             runTest("compiler/testData/ir/loweredIr/interpreter/unsignedConst.kt");
         }
+
+        @Test
+        @TestMetadata("useCorrectToString.kt")
+        public void testUseCorrectToString() throws Exception {
+            runTest("compiler/testData/ir/loweredIr/interpreter/useCorrectToString.kt");
+        }
     }
 }

compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/checker/IrCompileTimeChecker.kt

@@ -134,7 +134,7 @@ class IrCompileTimeChecker(
                 is IrGetObjectValue -> {
                     val toString = arg.symbol.owner.declarations
                         .filterIsInstance<IrSimpleFunction>()
-                        .single { it.name.asString() == "toString" && it.valueParameters.isEmpty() }
+                        .single { it.name.asString() == "toString" && it.valueParameters.isEmpty() && it.extensionReceiverParameter == null }
 
                     mode.canEvaluateFunction(toString, null) && toString.visitBodyIfNeeded()
                 }

compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/state/Common.kt

@@ -52,7 +52,7 @@ internal class Common private constructor(override val irClass: IrClass, overrid
         return irClass.declarations
             .filterIsInstance<IrSimpleFunction>()
             .single {
-                it.name == Name.identifier("equals") && it.dispatchReceiverParameter != null
+                it.name == Name.identifier("equals") && it.dispatchReceiverParameter != null && it.extensionReceiverParameter == null
                         && it.valueParameters.size == 1 && it.valueParameters[0].type.isNullableAny()
             }
             .let { it.resolveFakeOverride() as IrSimpleFunction }
@@ -60,13 +60,13 @@ internal class Common private constructor(override val irClass: IrClass, overrid
 
     fun getHashCodeFunction(): IrSimpleFunction {
         return irClass.declarations.filterIsInstance<IrSimpleFunction>()
-            .single { it.name.asString() == "hashCode" && it.valueParameters.isEmpty() }
+            .single { it.name.asString() == "hashCode" && it.valueParameters.isEmpty() && it.extensionReceiverParameter == null }
             .let { it.resolveFakeOverride() as IrSimpleFunction }
     }
 
     fun getToStringFunction(): IrSimpleFunction {
         return irClass.declarations.filterIsInstance<IrSimpleFunction>()
-            .single { it.name.asString() == "toString" && it.valueParameters.isEmpty() }
+            .single { it.name.asString() == "toString" && it.valueParameters.isEmpty() && it.extensionReceiverParameter == null }
             .let { it.resolveFakeOverride() as IrSimpleFunction }
     }
 

compiler/testData/ir/loweredIr/interpreter/useCorrectToString.kt

@@ -0,0 +1,13 @@
+// This test is needed to check that IrCompileTimeChecker will not fail trying to find and analyze correct toString method
+
+object Obj {
+    override fun toString(): String = "OK"
+
+    fun Int.toString(): String = "Not OK"
+}
+
+const val a = 1 // this is a dummy const to avoid check in IrInterpreterDumpHandler
+
+fun box(): String {
+    return "" + "$Obj" // force a call
+}