pfultz2

    test.cpp:16:45: error: Using object that is a temporary. [danglingTemporaryLifetime]
        assert((std::vector<int>{1, 2, 3, 4} == append34({1, 2}))); // FAIL: UB
                                                ^
    test.cpp:3:12: note: Return lambda.
        return [&](std::vector<int>&& items) {
               ^
    test.cpp:2:50: note: Passed to reference.
    auto make_appender(std::vector<int> const& suffix) {
                                                     ^
    test.cpp:4:36: note: Lambda captures variable by reference here.
            return append(move(items), suffix);
                                       ^
    test.cpp:15:35: note: Passed to 'make_appender'.
        auto append34 = make_appender({3, 4});
                                      ^
    test.cpp:15:35: note: Temporary created here.
        auto append34 = make_appender({3, 4});
                                      ^
    test.cpp:16:45: note: Using object that is a temporary.
        assert((std::vector<int>{1, 2, 3, 4} == append34({1, 2}))); // FAIL: UB

    <source>:8:16: warning: passing a dangling pointer as argument [-Wlifetime]
      std::cout << sv;
                   ^

    <source>:7:38: note: temporary was destroyed at the end of the full expression
      std::string_view sv = s + "World\n";
                                         ^

    <source>:7:12: warning: Returning lambda that captures local variable 'x' that will be invalid when returning. [returnDanglingLifetime]
        return [&]() { return *x; };
               ^
    <source>:7:28: note: Lambda captures variable by reference here.
        return [&]() { return *x; };
                               ^
    <source>:6:49: note: Variable created here.
    std::function<int(void)> f(std::shared_ptr<int> x) {
                                                    ^
    <source>:7:12: note: Returning lambda that captures local variable 'x' that will be invalid when returning.
        return [&]() { return *x; };
               ^