C5027 "Move assignment operator was implicitly defined as deleted"

I have this code:

template < typename TFunc >
class Foo
{
public:
  Foo(TFunc func) : func_(func) {}
  Foo(Foo<TFunc> const &) = delete;
  Foo<TFunc> & operator=(Foo<TFunc> const &) = delete;
  Foo(Foo<TFunc> &&) = default;
  Foo<TFunc> & operator=(Foo<TFunc> &&) = default;
private:
  TFunc func_;
};

int main()
{
  auto func = []() {};
  auto f = Foo<decltype(func)>(func);
  return 0;
}

When I compile this code with Visual Studio 2015 with the /Wallflag, I get the following warning:

C5027 'Foo<main::<lambda_e5404f82e4b38ca1d164ce09039df46c>>': move assignment operator was implicitly defined as deleted

I don't understand why the move assignment operator would be implicitly defined as deleted while it is explicitely defined as defaulted. Any idea?