Fix memory leaks

src/ipc.cc

@@ -79,3 +79,5 @@ const char* IpcIdToString(IpcId id) {
 
 BaseIpcMessage::BaseIpcMessage(IpcId method_id)
   : method_id(method_id) {}
+
+BaseIpcMessage::~BaseIpcMessage() = default;

src/ipc.h

@@ -55,6 +55,7 @@ const char* IpcIdToString(IpcId id);
 struct BaseIpcMessage {
   const IpcId method_id;
   BaseIpcMessage(IpcId method_id);
+  virtual ~BaseIpcMessage();
 };
 
 template <typename T>

src/language_server_api.cc

@@ -101,6 +101,8 @@ MessageRegistry* MessageRegistry::instance() {
   return instance_;
 }
 
+lsBaseOutMessage::~lsBaseOutMessage() = default;
+
 void lsResponseError::Write(Writer& visitor) {
   auto& value = *this;
   int code2 = static_cast<int>(this->code);

src/language_server_api.h

@@ -98,6 +98,7 @@ struct MessageRegistry {
 
 
 struct lsBaseOutMessage {
+  virtual ~lsBaseOutMessage();
   virtual void Write(std::ostream& out) = 0;
 };