Interestingly C++ makes this UB. > Otherwise, flowing off the end of a function other than main or a coroutine ([dcl.fct.def.coroutine]) results in undefined b

Interestingly C++ makes this UB. > Otherwise, flowing off the end of a function other than main or a coroutine ([dcl.fct.def.coroutine]) results in undefined behavior. https://timsong-cpp.github.io/cppwp/n4868/stmt.return#2.sentence-9 https://timsong-cpp.github.io/cppwp/n4868/stmt.return#2.sent... edit: This also manifests in compiler optimizations, at least in gcc https://godbolt.org/z/GhxjdWqGb https://godbolt.org/z/GhxjdWqGb