is it possible to add a private extension to the core language (C/C++) by writing a gcc plugin?
The extension in mind is something like this
Later I want this be possible also inside statement headers, for example
for ([double d = 1.0; bool f = false;] size_t i = 0; i < vec.size(); ++i)
The scope of the so-defined variables shall be the same scope they are in, ie. in the for-loop case just the scope of the for-loop itself, much like the case with i.