--- a/src/compiler/csharp_generator.cc	(index)
+++ b/src/compiler/csharp_generator.cc	(working tree)
@@ -429,7 +429,7 @@ void GenerateServiceDescriptorProperty(Printer* out,
   out->Print("  get { return $umbrella$.Descriptor.Services[$index$]; }\n",
              "umbrella",
              GRPC_CUSTOM_CSHARP_GETREFLECTIONCLASSNAME(service->file()),
-             "index", index.str());
+             "index", TString(index.str()));
   out->Print("}\n");
   out->Print("\n");
 }
--- a/src/compiler/objective_c_generator.h	(index)
+++ b/src/compiler/objective_c_generator.h	(working tree)
@@ -33,26 +33,26 @@ using ::grpc::protobuf::ServiceDescriptor;
 using ::TString;
 
 // Returns forward declaration of classes in the generated header file.
-string GetAllMessageClasses(const FileDescriptor* file);
+TString GetAllMessageClasses(const FileDescriptor* file);
 
 // Returns the content to be included defining the @protocol segment at the
 // insertion point of the generated implementation file. This interface is
 // legacy and for backwards compatibility.
-string GetProtocol(const ServiceDescriptor* service,
+TString GetProtocol(const ServiceDescriptor* service,
                    const Parameters& generator_params);
 
 // Returns the content to be included defining the @protocol segment at the
 // insertion point of the generated implementation file.
-string GetV2Protocol(const ServiceDescriptor* service);
+TString GetV2Protocol(const ServiceDescriptor* service);
 
 // Returns the content to be included defining the @interface segment at the
 // insertion point of the generated implementation file.
-string GetInterface(const ServiceDescriptor* service,
+TString GetInterface(const ServiceDescriptor* service,
                     const Parameters& generator_params);
 
 // Returns the content to be included in the "global_scope" insertion point of
 // the generated implementation file.
-string GetSource(const ServiceDescriptor* service,
+TString GetSource(const ServiceDescriptor* service,
                  const Parameters& generator_params);
 
 }  // namespace grpc_objective_c_generator
--- a/src/compiler/objective_c_generator_helpers.h	(index)
+++ b/src/compiler/objective_c_generator_helpers.h	(working tree)
@@ -32,1 +32,1 @@ using ::grpc::protobuf::FileDescriptor;
-inline string MessageHeaderName(const FileDescriptor* file) {
+inline TString MessageHeaderName(const FileDescriptor* file) {
--- a/src/compiler/ruby_generator_string-inl.h	(index)
+++ b/src/compiler/ruby_generator_string-inl.h	(working tree)
@@ -34,9 +34,9 @@ namespace grpc_ruby_generator {
 inline std::vector<TString>& Split(const TString& s, char delim,
                                        std::vector<TString>* elems) {
   std::stringstream ss(s);
-  TString item;
+  std::string item;
   while (getline(ss, item, delim)) {
-    elems->push_back(item);
+    elems->emplace_back(item);
   }
   return *elems;
 }