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What stage is the differentiation proposal in? It seems odd they talked about reverse mode AD but made no mention of memory management for it. They also don't mention anything about FastAD or Stan Math which I think do some pretty innovative things in this space.
Boost being slow to compile also probably isn't the best argument - especially if its high overhead in an empty file - you could probably easily argue that concepts will fix this, or better compilers, or just simply that boost is not written to compile quickly. This is what I cracked together, and the compile times are pretty fine. Its also probable that a compiler internals based AST would come with its own overheads - and without measured times, this point seems very arguable