Index: src/SymTab/Validate.cc
===================================================================
--- src/SymTab/Validate.cc	(revision b3b2077b1feda429f174cfb4f374cb1e00580630)
+++ src/SymTab/Validate.cc	(revision b7260842d3d46862cb3406f96e73c6e605589177)
@@ -94,15 +94,16 @@
 
 	/// Associates forward declarations of aggregates with their definitions
-	class Pass2 : public Indexer {
+	class Pass2 final : public Indexer {
 		typedef Indexer Parent;
 	  public:
 		Pass2( bool doDebug, const Indexer *indexer );
 	  private:
-		virtual void visit( StructInstType *structInst );
-		virtual void visit( UnionInstType *unionInst );
-		virtual void visit( TraitInstType *contextInst );
-		virtual void visit( StructDecl *structDecl );
-		virtual void visit( UnionDecl *unionDecl );
-		virtual void visit( TypeInstType *typeInst );
+  		using Indexer::visit;
+		void visit( StructInstType *structInst ) final;
+		void visit( UnionInstType *unionInst ) final;
+		void visit( TraitInstType *contextInst ) final;
+		void visit( StructDecl *structDecl ) final;
+		void visit( UnionDecl *unionDecl ) final;
+		void visit( TypeInstType *typeInst ) final;
 
 		const Indexer *indexer;
@@ -182,9 +183,10 @@
 	};
 
-	class CompoundLiteral : public GenPoly::DeclMutator {
+	class CompoundLiteral final : public GenPoly::DeclMutator {
 		DeclarationNode::StorageClass storageclass = DeclarationNode::NoStorageClass;
 
-		virtual DeclarationWithType * mutate( ObjectDecl *objectDecl );
-		virtual Expression *mutate( CompoundLiteralExpr *compLitExpr );
+		using GenPoly::DeclMutator::mutate;
+		DeclarationWithType * mutate( ObjectDecl *objectDecl ) final;
+		Expression *mutate( CompoundLiteralExpr *compLitExpr ) final;
 	};
 
@@ -652,5 +654,5 @@
 	void EliminateTypedef::addImplicitTypedef( AggDecl * aggDecl ) {
 		if ( typedefNames.count( aggDecl->get_name() ) == 0 ) {
-			Type *type;
+			Type *type = nullptr;
 			if ( StructDecl * newDeclStructDecl = dynamic_cast< StructDecl * >( aggDecl ) ) {
 				type = new StructInstType( Type::Qualifiers(), newDeclStructDecl->get_name() );