fix unit tests

Author: HuaHuaY

src/iceberg/util/lazy.h

@@ -45,13 +45,16 @@ class Lazy {
  public:
   template <typename... Args>
     requires std::invocable<decltype(InitFunc), Args...> &&
-             std::same_as<std::invoke_result_t<decltype(InitFunc), Args...>,
-                          iceberg::Result<T>>
-  iceberg::Result<T*> get(Args&&... args) const {
-    iceberg::Result<T> result;
-    std::call_once(
-        flag, [&result, &args...]() { result = InitFunc(std::forward<Args>(args)...); });
-    ICEBERG_ASSIGN_OR_RAISE(this->value, result);
+             std::same_as<std::invoke_result_t<decltype(InitFunc), Args...>, Result<T>>
+  Result<T*> get(Args&&... args) const {
+    Result<T> result;
+    std::call_once(flag, [&result, this, &args...]() {
+      result = InitFunc(std::forward<Args>(args)...);
+      if (result) {
+        this->value = std::move(result.value());
+      }
+    });
+    ICEBERG_RETURN_UNEXPECTED(result);
     return &value;
   }