View Compilation Error

0_0_39603107_19606.cpp: In instantiation of 'main()::<lambda(auto:54&&, int)> [with auto:54 = main()::<lambda(auto:54&&, int)>&]':
0_0_39603107_19606.cpp:58:8:   required from here
0_0_39603107_19606.cpp:55:5: error: no return statement in 'constexpr' function returning non-void
   55 |     };
      |     ^