Index: clangd/ClangdLSPServer.cpp
===================================================================
--- clangd/ClangdLSPServer.cpp
+++ clangd/ClangdLSPServer.cpp
@@ -409,7 +409,7 @@
   JSONRPCDispatcher Dispatcher([](const json::Expr &Params) {
     replyError(ErrorCode::MethodNotFound, "method not found");
   });
-  registerCallbackHandlers(Dispatcher, Out, /*Callbacks=*/*this);
+  registerCallbackHandlers(Dispatcher, /*Callbacks=*/*this);
 
   // Run the Language Server loop.
   runLanguageServerLoop(In, Out, InputStyle, Dispatcher, IsDone);
Index: clangd/ProtocolHandlers.h
===================================================================
--- clangd/ProtocolHandlers.h
+++ clangd/ProtocolHandlers.h
@@ -55,7 +55,7 @@
   virtual void onChangeConfiguration(DidChangeConfigurationParams &Params) = 0;
 };
 
-void registerCallbackHandlers(JSONRPCDispatcher &Dispatcher, JSONOutput &Out,
+void registerCallbackHandlers(JSONRPCDispatcher &Dispatcher,
                               ProtocolCallbacks &Callbacks);
 
 } // namespace clangd
Index: clangd/ProtocolHandlers.cpp
===================================================================
--- clangd/ProtocolHandlers.cpp
+++ clangd/ProtocolHandlers.cpp
@@ -38,16 +38,14 @@
   }
 
   JSONRPCDispatcher &Dispatcher;
-  JSONOutput *Out;
   ProtocolCallbacks *Callbacks;
 };
 
 } // namespace
 
 void clangd::registerCallbackHandlers(JSONRPCDispatcher &Dispatcher,
-                                      JSONOutput &Out,
                                       ProtocolCallbacks &Callbacks) {
-  HandlerRegisterer Register{Dispatcher, &Out, &Callbacks};
+  HandlerRegisterer Register{Dispatcher, &Callbacks};
 
   Register("initialize", &ProtocolCallbacks::onInitialize);
   Register("shutdown", &ProtocolCallbacks::onShutdown);