FIR checker: make FirFunctionNameChecker a subclass of FirSimpleFunctionChecker

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/declaration/FirFunctionNameChecker.kt

@@ -12,17 +12,16 @@ import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors
 import org.jetbrains.kotlin.fir.analysis.diagnostics.reportOn
 import org.jetbrains.kotlin.fir.declarations.FirClass
 import org.jetbrains.kotlin.fir.declarations.FirFile
-import org.jetbrains.kotlin.fir.declarations.FirFunction
 import org.jetbrains.kotlin.fir.declarations.FirSimpleFunction
 import org.jetbrains.kotlin.name.SpecialNames
 
-object FirFunctionNameChecker : FirFunctionChecker() {
+object FirFunctionNameChecker : FirSimpleFunctionChecker() {
-    override fun check(declaration: FirFunction<*>, context: CheckerContext, reporter: DiagnosticReporter) {
+    override fun check(declaration: FirSimpleFunction, context: CheckerContext, reporter: DiagnosticReporter) {
         val source = declaration.source
         if (source == null || source.kind is FirFakeSourceElementKind) return
         val containingDeclaration = context.containingDeclarations.lastOrNull()
         val isNonLocal = containingDeclaration is FirFile || containingDeclaration is FirClass<*>
-        if (declaration is FirSimpleFunction && declaration.name == SpecialNames.NO_NAME_PROVIDED && isNonLocal) {
+        if (declaration.name == SpecialNames.NO_NAME_PROVIDED && isNonLocal) {
             reporter.reportOn(source, FirErrors.FUNCTION_DECLARATION_WITH_NO_NAME, context)
         }
     }

compiler/fir/entrypoint/src/org/jetbrains/kotlin/fir/checkers/CommonDeclarationCheckers.kt

@@ -29,10 +29,13 @@ object CommonDeclarationCheckers : DeclarationCheckers() {
 
     override val functionCheckers: Set<FirFunctionChecker> = setOf(
         FirContractChecker,
-        FirFunctionNameChecker,
         FirFunctionParameterChecker,
     )
 
+    override val simpleFunctionCheckers: Set<FirSimpleFunctionChecker> = setOf(
+        FirFunctionNameChecker
+    )
+
     override val propertyCheckers: Set<FirPropertyChecker> = setOf(
         FirInapplicableLateinitChecker,
         FirDestructuringDeclarationChecker,