[FE 1.0] Report a more precise diagnostic when parameter modifiers (v…

…ararg) are changed in actualization

^KT-62747 Fixed

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Errors.java

@@ -859,6 +859,8 @@ public interface Errors {
             PROPERTY_KIND_CHANGED_IN_NON_FINAL_EXPECT_CLASSIFIER_ACTUALIZATION_WARNING = DiagnosticFactory1.create(WARNING, VAL_OR_VAR_NODE);
     DiagnosticFactory1<KtCallableDeclaration, ExpectActualMemberDiff<CallableMemberDescriptor, ClassDescriptor>>
             LATEINIT_CHANGED_IN_NON_FINAL_EXPECT_CLASSIFIER_ACTUALIZATION_WARNING = DiagnosticFactory1.create(WARNING, LATEINIT_MODIFIER);
+    DiagnosticFactory1<KtCallableDeclaration, ExpectActualMemberDiff<CallableMemberDescriptor, ClassDescriptor>>
+            VARARG_CHANGED_IN_NON_FINAL_EXPECT_CLASSIFIER_ACTUALIZATION_WARNING = DiagnosticFactory1.create(WARNING, LATEINIT_MODIFIER);
     DiagnosticFactory1<KtCallableDeclaration, ExpectActualMemberDiff<CallableMemberDescriptor, ClassDescriptor>>
             TYPE_PARAMETER_NAMES_CHANGED_IN_NON_FINAL_EXPECT_CLASSIFIER_ACTUALIZATION_WARNING = DiagnosticFactory1.create(WARNING, TYPE_PARAMETERS_OR_DECLARATION_SIGNATURE);
 

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/rendering/DefaultErrorMessages.java

@@ -424,6 +424,9 @@ public static DiagnosticRenderer getRendererForDiagnostic(@NotNull UnboundDiagno
         MAP.put(LATEINIT_CHANGED_IN_NON_FINAL_EXPECT_CLASSIFIER_ACTUALIZATION_WARNING,
                 "{0}. This warning will become an error in future releases. Also see https://youtrack.jetbrains.com/issue/KT-22841 for more details",
                 ExpectActualScopeDiffRenderer.INSTANCE);
+        MAP.put(VARARG_CHANGED_IN_NON_FINAL_EXPECT_CLASSIFIER_ACTUALIZATION_WARNING,
+                "{0}. This warning will become an error in future releases. Also see https://youtrack.jetbrains.com/issue/KT-22841 for more details",
+                ExpectActualScopeDiffRenderer.INSTANCE);
         MAP.put(SETTER_VISIBILITY_CHANGED_IN_NON_FINAL_EXPECT_CLASSIFIER_ACTUALIZATION_WARNING,
                 "{0}. This warning will become an error in future releases. Also see https://youtrack.jetbrains.com/issue/KT-22841 for more details",
                 ExpectActualScopeDiffRenderer.INSTANCE);

compiler/frontend/src/org/jetbrains/kotlin/resolve/checkers/ActualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker.kt

@@ -219,6 +219,8 @@ private fun BindingTrace.reportIfPossible(diff: ExpectActualMemberDiff<CallableM
             Errors.PROPERTY_KIND_CHANGED_IN_NON_FINAL_EXPECT_CLASSIFIER_ACTUALIZATION_WARNING.on(psi, diff)
         ExpectActualMemberDiff.Kind.LateinitChangedInOverride ->
             Errors.LATEINIT_CHANGED_IN_NON_FINAL_EXPECT_CLASSIFIER_ACTUALIZATION_WARNING.on(psi, diff)
+        ExpectActualMemberDiff.Kind.VarargChangedInOverride ->
+            Errors.VARARG_CHANGED_IN_NON_FINAL_EXPECT_CLASSIFIER_ACTUALIZATION_WARNING.on(psi, diff)
         ExpectActualMemberDiff.Kind.TypeParameterNamesChangedInOverride ->
             Errors.TYPE_PARAMETER_NAMES_CHANGED_IN_NON_FINAL_EXPECT_CLASSIFIER_ACTUALIZATION_WARNING.on(psi, diff)
     }

compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/changeVarargModifierInOverride.fir.kt

@@ -0,0 +1,16 @@
+// MODULE: m1-common
+// FILE: common.kt
+
+open class Base {
+    <!INCOMPATIBLE_MATCHING{JVM}!>open fun foo(vararg bar: Int) {}<!>
+}
+
+<!INCOMPATIBLE_MATCHING{JVM}!>expect open class Foo : Base {
+}<!>
+
+// MODULE: m2-jvm()()(m1-common)
+// FILE: jvm.kt
+
+actual open class Foo : Base() {
+    override fun foo(bar: IntArray) {}
+}

compiler/testData/diagnostics/tests/multiplatform/actualClassifierMustHasTheSameMembersAsNonFinalExpectClassifierChecker/changeVarargModifierInOverride.kt

@@ -0,0 +1,16 @@
+// MODULE: m1-common
+// FILE: common.kt
+
+open class Base {
+    open fun foo(vararg bar: Int) {}
+}
+
+expect open class Foo : Base {
+}
+
+// MODULE: m2-jvm()()(m1-common)
+// FILE: jvm.kt
+
+actual open <!ACTUAL_CLASSIFIER_MUST_HAVE_THE_SAME_MEMBERS_AS_NON_FINAL_EXPECT_CLASSIFIER_WARNING!>class Foo<!> : Base() {
+    override fun <!VARARG_CHANGED_IN_NON_FINAL_EXPECT_CLASSIFIER_ACTUALIZATION_WARNING!>foo<!>(bar: IntArray) {}
+}

core/compiler.common/src/org/jetbrains/kotlin/resolve/multiplatform/ExpectActualMemberDiff.kt

@@ -45,6 +45,10 @@ data class ExpectActualMemberDiff<out M, out C>(val kind: Kind, val actualMember
             "{0}: the property modifiers (lateinit) of this member must be the same in the expect class and the actual class. " +
                     "This error happens because the expect class ''{1}'' is non-final"
         ),
+        VarargChangedInOverride(
+            "{0}: the parameter modifiers (vararg) of this member must be the same in the expect class and the actual class. " +
+                    "This error happens because the expect class ''{1}'' is non-final"
+        ),
         TypeParameterNamesChangedInOverride(
             "{0}: the type parameter names of this member must be the same in the expect class and the actual class. " +
                     "This error happens because the expect class ''{1}'' is non-final"
@@ -83,6 +87,6 @@ fun ExpectActualCompatibility.Incompatible<*>.toMemberDiffKind(): ExpectActualMe
     ExpectActualCompatibility.Incompatible.Unknown -> null // Unknown incompatibility is never reported
     ExpectActualCompatibility.Incompatible.ValueParameterCrossinline -> null // inline fun can't be overridden
     ExpectActualCompatibility.Incompatible.ValueParameterNoinline -> null // inline fun can't be overridden
-    ExpectActualCompatibility.Incompatible.ValueParameterVararg -> ExpectActualMemberDiff.Kind.NonPrivateCallableAdded
+    ExpectActualCompatibility.Incompatible.ValueParameterVararg -> ExpectActualMemberDiff.Kind.VarargChangedInOverride
     ExpectActualCompatibility.Incompatible.Visibility -> ExpectActualMemberDiff.Kind.VisibilityChangedInOverride
 }