[FIR] Report MULTIPLE_DEFAULTS_INHERITED_FROM_SUPERTYPES

Reporting it for `VIRTUAL_MEMBER_HIDDEN`
is ok, because `VIRTUAL_MEMBER_HIDDEN`
has always been an error, so we are
allowed to treat these as overrides
implicitly.

^KT-59408 Fixed
^KT-59419 Fixed
^KT-57076 Fixed

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDataClassConverters.kt

@@ -2588,6 +2588,20 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
+    add(FirErrors.MULTIPLE_DEFAULTS_INHERITED_FROM_SUPERTYPES) { firDiagnostic ->
+        MultipleDefaultsInheritedFromSupertypesImpl(
+            firSymbolBuilder.buildSymbol(firDiagnostic.a),
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
+    add(FirErrors.MULTIPLE_DEFAULTS_INHERITED_FROM_SUPERTYPES_WHEN_NO_EXPLICIT_OVERRIDE) { firDiagnostic ->
+        MultipleDefaultsInheritedFromSupertypesWhenNoExplicitOverrideImpl(
+            firSymbolBuilder.buildSymbol(firDiagnostic.a),
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
     add(FirErrors.TYPEALIAS_EXPANDS_TO_ARRAY_OF_NOTHINGS) { firDiagnostic ->
         TypealiasExpandsToArrayOfNothingsImpl(
             firSymbolBuilder.typeBuilder.buildKtType(firDiagnostic.a),

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnostics.kt

@@ -1839,6 +1839,16 @@ sealed interface KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
         val containingClassName: Name
     }
 
+    interface MultipleDefaultsInheritedFromSupertypes : KtFirDiagnostic<KtElement> {
+        override val diagnosticClass get() = MultipleDefaultsInheritedFromSupertypes::class
+        val valueParameter: KtSymbol
+    }
+
+    interface MultipleDefaultsInheritedFromSupertypesWhenNoExplicitOverride : KtFirDiagnostic<KtElement> {
+        override val diagnosticClass get() = MultipleDefaultsInheritedFromSupertypesWhenNoExplicitOverride::class
+        val valueParameter: KtSymbol
+    }
+
     interface TypealiasExpandsToArrayOfNothings : KtFirDiagnostic<KtElement> {
         override val diagnosticClass get() = TypealiasExpandsToArrayOfNothings::class
         val type: KtType

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnosticsImpl.kt

@@ -2209,6 +2209,18 @@ internal class CannotChangeAccessPrivilegeImpl(
     token: KtLifetimeToken,
 ) : KtAbstractFirDiagnostic<KtModifierListOwner>(firDiagnostic, token), KtFirDiagnostic.CannotChangeAccessPrivilege
 
+internal class MultipleDefaultsInheritedFromSupertypesImpl(
+    override val valueParameter: KtSymbol,
+    firDiagnostic: KtPsiDiagnostic,
+    token: KtLifetimeToken,
+) : KtAbstractFirDiagnostic<KtElement>(firDiagnostic, token), KtFirDiagnostic.MultipleDefaultsInheritedFromSupertypes
+
+internal class MultipleDefaultsInheritedFromSupertypesWhenNoExplicitOverrideImpl(
+    override val valueParameter: KtSymbol,
+    firDiagnostic: KtPsiDiagnostic,
+    token: KtLifetimeToken,
+) : KtAbstractFirDiagnostic<KtElement>(firDiagnostic, token), KtFirDiagnostic.MultipleDefaultsInheritedFromSupertypesWhenNoExplicitOverride
+
 internal class TypealiasExpandsToArrayOfNothingsImpl(
     override val type: KtType,
     firDiagnostic: KtPsiDiagnostic,