Set C++ tests

codegen/array/snippets/stack_array_cpp

@@ -1,4 +1,4 @@
-([]() {{ \
+([&]() {{ \
   persistent {T} buf[wapp_misc_utils_u64_round_up_pow2(wapp_misc_utils_va_args_count({T}, __VA_ARGS__) * 2)] = {{__VA_ARGS__}}; \
   return {ArrayType}{{ \
     buf, \

codegen/array/snippets/stack_capacity_array_cpp

@@ -1,4 +1,4 @@
-([]() {{ \
+([&]() {{ \
   persistent {T} buf[CAPACITY] = {{}}; \
   return {ArrayType}{{buf, 0, CAPACITY, sizeof({T})}}; \
 }}())