clang - shared_ptr fails to run its deleter

This code prints 0 or 666 when built with clang++ -std=c++11, depending on the optimization level (-O3 yields 666, which is what I would expect). When lambda is passed by universal reference the problem disappears.

FYI, GCC prints 666 on all the versions I've tested.

Is it a compiler bug or the code is incorrect?

template <typename T>
std::shared_ptr<void> onScopeExit(T f)
{
    return std::shared_ptr<void>((void*)1, [&](void *) {
        f();
    });
}

struct A {
  void f() {
    auto scopeGuard = onScopeExit([&]() { i = 666; }); //  [1]
    // ... (some work)
  } // (lambda [1] being ? called on scope exit)

  int i = 0;
};

A a;

int main() {
  a.f();
  std::cout << a.i << std::endl;
}

The compiler in question is:

Apple LLVM version 9.1.0 (clang-902.0.39.2)
Target: x86_64-apple-darwin17.7.0