It's unsafe and intentionally crashes on windows newlines and tabs. If C adopts defer, I don't think there will be enough of a differentiation to overcome the cynical user hostility.
Just because people don't like this doesn't mean it's not true.
> C adopts defer
C will almost certainly adopt defer in the next revision standard. C++ (via RAII + scoped classes) already effectively has defer.
But the fact that it's unsafe means it's effectively unadoptable, no reason not to use C inplace of it.