Some manual cleanup.
You can also take more proactive steps.
Well, one way is to poll for it.
Going back to the old standby to filter out unwanted specializations.
Finding a template metaprogramming trick that works.
Hunting for the right template metaprogramming trick.
Teasing out the calling convention from a function pointer.
Yet another function signature to specialize.
Trying to infer the noexcept qualifier.
Learning the magic incantation.