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Writing this on a debian machine, and trying "g++ --std=c++23 -fmodules-ts" does not work, and from https://en.cppreference.com/w/cpp/23 looks like the "paper" for this is P2465R3, for which clang++ 17 has "partial support". I apt installed clang++17, and it still didn't work, complaining "module 'std' not found"
I understand that "import std;" is a very new feature and not "finalized" or whatever, but this book is supposed to be for beginners to C++; I wonder how the average beginner would react to that?
(I found the same thing a year or two ago when reading "Tour of C++")
It's such a good book. If you really take the time to understand the book C++ it seems kind of sad the world was so afraid of it.
But of course after all this I of course met an army of people who had never read a book like this at all and wrote horrifying C++ code.