Index: clang/include/clang/Analysis/BodyFarm.h
===================================================================
--- clang/include/clang/Analysis/BodyFarm.h
+++ clang/include/clang/Analysis/BodyFarm.h
@@ -40,6 +40,9 @@
   /// Remove copy constructor to avoid accidental copying.
   BodyFarm(const BodyFarm &other) = delete;
 
+  /// Copy assignment opearator.
+  BodyFarm &operator=(const BodyFarm &other) = delete;
+
 private:
   typedef llvm::DenseMap<const Decl *, std::optional<Stmt *>> BodyMap;
 
Index: clang/include/clang/Sema/ParsedAttr.h
===================================================================
--- clang/include/clang/Sema/ParsedAttr.h
+++ clang/include/clang/Sema/ParsedAttr.h
@@ -696,6 +696,7 @@
   AttributePool(AttributeFactory &factory) : Factory(factory) {}
 
   AttributePool(const AttributePool &) = delete;
+  AttributePool &operator=(const AttributePool &) = delete;
 
   ~AttributePool() { Factory.reclaimPool(*this); }
 
@@ -912,6 +913,7 @@
 public:
   ParsedAttributes(AttributeFactory &factory) : pool(factory) {}
   ParsedAttributes(const ParsedAttributes &) = delete;
+  ParsedAttributes &operator=(const ParsedAttributes &) = delete;
 
   AttributePool &getPool() const { return pool; }
 
Index: clang/include/clang/Sema/Sema.h
===================================================================
--- clang/include/clang/Sema/Sema.h
+++ clang/include/clang/Sema/Sema.h
@@ -1783,6 +1783,7 @@
     SemaDiagnosticBuilder(Kind K, SourceLocation Loc, unsigned DiagID,
                           const FunctionDecl *Fn, Sema &S);
     SemaDiagnosticBuilder(SemaDiagnosticBuilder &&D);
+    SemaDiagnosticBuilder &operator=(SemaDiagnosticBuilder &&D);
     SemaDiagnosticBuilder(const SemaDiagnosticBuilder &) = default;
     ~SemaDiagnosticBuilder();
 
Index: clang/lib/Analysis/UnsafeBufferUsage.cpp
===================================================================
--- clang/lib/Analysis/UnsafeBufferUsage.cpp
+++ clang/lib/Analysis/UnsafeBufferUsage.cpp
@@ -762,6 +762,7 @@
 public:
   Strategy() = default;
   Strategy(const Strategy &) = delete; // Let's avoid copies.
+  Strategy &operator=(const Strategy &) = delete;
   Strategy(Strategy &&) = default;
 
   void set(const VarDecl *VD, Kind K) { Map[VD] = K; }
Index: clang/lib/Serialization/ASTWriterStmt.cpp
===================================================================
--- clang/lib/Serialization/ASTWriterStmt.cpp
+++ clang/lib/Serialization/ASTWriterStmt.cpp
@@ -42,6 +42,7 @@
           Code(serialization::STMT_NULL_PTR), AbbrevToUse(0) {}
 
     ASTStmtWriter(const ASTStmtWriter&) = delete;
+    ASTStmtWriter &operator=(const ASTStmtWriter&) = delete;
 
     uint64_t Emit() {
       assert(Code != serialization::STMT_NULL_PTR &&