K2 opt-in: don't take sub./int. override parent classes into account

#KT-54823 Fixed

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java

@@ -37850,6 +37850,12 @@ public class DiagnosisCompilerTestFE10TestdataTestGenerated extends AbstractDiag
                 runTest("compiler/testData/diagnostics/testsWithStdLib/experimental/bodyUsagesAndInline.kt");
             }
 
+            @Test
+            @TestMetadata("callOfBaseFunctionFromGeneric.kt")
+            public void testCallOfBaseFunctionFromGeneric() throws Exception {
+                runTest("compiler/testData/diagnostics/testsWithStdLib/experimental/callOfBaseFunctionFromGeneric.kt");
+            }
+
             @Test
             @TestMetadata("classMembers.kt")
             public void testClassMembers() throws Exception {

compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsTestGenerated.java

@@ -37850,6 +37850,12 @@ public class FirOldFrontendDiagnosticsTestGenerated extends AbstractFirDiagnosti
                 runTest("compiler/testData/diagnostics/testsWithStdLib/experimental/bodyUsagesAndInline.kt");
             }
 
+            @Test
+            @TestMetadata("callOfBaseFunctionFromGeneric.kt")
+            public void testCallOfBaseFunctionFromGeneric() throws Exception {
+                runTest("compiler/testData/diagnostics/testsWithStdLib/experimental/callOfBaseFunctionFromGeneric.kt");
+            }
+
             @Test
             @TestMetadata("classMembers.kt")
             public void testClassMembers() throws Exception {

compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsWithLightTreeTestGenerated.java

@@ -37850,6 +37850,12 @@ public class FirOldFrontendDiagnosticsWithLightTreeTestGenerated extends Abstrac
                 runTest("compiler/testData/diagnostics/testsWithStdLib/experimental/bodyUsagesAndInline.kt");
             }
 
+            @Test
+            @TestMetadata("callOfBaseFunctionFromGeneric.kt")
+            public void testCallOfBaseFunctionFromGeneric() throws Exception {
+                runTest("compiler/testData/diagnostics/testsWithStdLib/experimental/callOfBaseFunctionFromGeneric.kt");
+            }
+
             @Test
             @TestMetadata("classMembers.kt")
             public void testClassMembers() throws Exception {

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/expression/FirOptInUsageBaseChecker.kt

@@ -159,16 +159,20 @@ object FirOptInUsageBaseChecker {
                 if (this is FirNamedFunctionSymbol) {
                     parentClassScope?.processDirectlyOverriddenFunctions(this) {
                         it.loadExperimentalities(
-                            context, result, visited, fromSetter = false, dispatchReceiverType = null, fromSupertype = false
+                            context, result, visited, fromSetter = false, dispatchReceiverType, fromSupertype = false
                         )
                         ProcessorAction.NEXT
                     }
                 } else if (this is FirPropertySymbol) {
                     parentClassScope?.processDirectlyOverriddenProperties(this) {
-                        it.loadExperimentalities(context, result, visited, fromSetter, dispatchReceiverType = null, fromSupertype = false)
+                        it.loadExperimentalities(context, result, visited, fromSetter, dispatchReceiverType, fromSupertype = false)
                         ProcessorAction.NEXT
                     }
                 }
+            } else if (dispatchReceiverType == null) {
+                parentClassSymbol?.loadExperimentalities(
+                    context, result, visited, fromSetter = false, dispatchReceiverType = null, fromSupertype = false
+                )
             }
             if (fir !is FirConstructor) {
                 // Without coneTypeSafe v fails in MT test (FirRenderer.kt)
@@ -180,13 +184,7 @@ object FirOptInUsageBaseChecker {
                     }
                 }
             }
-            if (dispatchReceiverType == null) {
+            dispatchReceiverType?.addExperimentalities(context, result, visited)
-                parentClassSymbol?.loadExperimentalities(
-                    context, result, visited, fromSetter = false, dispatchReceiverType = null, fromSupertype = false
-                )
-            } else {
-                dispatchReceiverType.addExperimentalities(context, result, visited)
-            }
             if (fromSetter && this is FirPropertySymbol) {
                 setterSymbol?.loadExperimentalities(
                     context, result, visited, fromSetter = false, dispatchReceiverType, fromSupertype = false

compiler/testData/diagnostics/testsWithStdLib/experimental/callOfBaseFunctionFromGeneric.kt

@@ -0,0 +1,31 @@
+// FIR_IDENTICAL
+// See KT-54823
+
+@RequiresOptIn
+annotation class Marker
+
+interface VeryBase<T> {
+    fun foo(base: VeryBase<*>) {}
+}
+
+@Marker
+abstract class Base<T> : VeryBase<T> {
+    fun bar(base: Base<*>) {}
+
+    fun baz() {}
+}
+
+@OptIn(Marker::class)
+open class Intermediate : Base<String>()
+
+class Derived : Intermediate()
+
+fun main() {
+    val d = Derived()
+    // Should be Ok (declared in VeryBase without marker)
+    d.foo(d)
+    // Should be Ok (declared in Base with marker, but called on a receiver of type Derived without marker)
+    d.baz()
+    // Should be Error (has a parameter of type Base with marker)
+    d.<!OPT_IN_USAGE_ERROR!>bar<!>(d)
+}

compiler/testData/diagnostics/testsWithStdLib/experimental/callOfBaseFunctionFromGeneric.txt

@@ -0,0 +1,47 @@
+package
+
+public fun main(): kotlin.Unit
+
+@Marker public abstract class Base</*0*/ T> : VeryBase<T> {
+    public constructor Base</*0*/ T>()
+    public final fun bar(/*0*/ base: Base<*>): kotlin.Unit
+    public final fun baz(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ base: VeryBase<*>): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class Derived : Intermediate {
+    public constructor Derived()
+    public final override /*1*/ /*fake_override*/ fun bar(/*0*/ base: Base<*>): kotlin.Unit
+    public final override /*1*/ /*fake_override*/ fun baz(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ base: VeryBase<*>): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+@kotlin.OptIn(markerClass = {Marker::class}) public open class Intermediate : Base<kotlin.String> {
+    public constructor Intermediate()
+    public final override /*1*/ /*fake_override*/ fun bar(/*0*/ base: Base<*>): kotlin.Unit
+    public final override /*1*/ /*fake_override*/ fun baz(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ base: VeryBase<*>): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+@kotlin.RequiresOptIn public final annotation class Marker : kotlin.Annotation {
+    public constructor Marker()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface VeryBase</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun foo(/*0*/ base: VeryBase<*>): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

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

@@ -37940,6 +37940,12 @@ public class DiagnosticTestGenerated extends AbstractDiagnosticTest {
                 runTest("compiler/testData/diagnostics/testsWithStdLib/experimental/bodyUsagesAndInline.kt");
             }
 
+            @Test
+            @TestMetadata("callOfBaseFunctionFromGeneric.kt")
+            public void testCallOfBaseFunctionFromGeneric() throws Exception {
+                runTest("compiler/testData/diagnostics/testsWithStdLib/experimental/callOfBaseFunctionFromGeneric.kt");
+            }
+
             @Test
             @TestMetadata("classMembers.kt")
             public void testClassMembers() throws Exception {