Add an extra pair of braces around constexpr std::array

src/google/protobuf/descriptor.cc

@@ -993,12 +993,12 @@ class TableArena {
     to_relocate->PrependTo(full_blocks_);
   }
 
-  static constexpr std::array<uint8_t, 6> kSmallSizes = {
+  static constexpr std::array<uint8_t, 6> kSmallSizes = {{
       // Sizes for pointer arrays.
       8, 16, 24, 32,
       // Sizes for string arrays (for descriptor names).
       // The most common array sizes are 2 and 3.
-      2 * sizeof(std::string), 3 * sizeof(std::string)};
+      2 * sizeof(std::string), 3 * sizeof(std::string)}};
 
   // Helper function to iterate all lists.
   std::array<Block*, 2 + kSmallSizes.size()> GetLists() const {