It’s usually non-trivial to add later, so you have no choice but to essentially make a guess and hope it’s right. There’s basically no real alternative. Of cou

It’s usually non-trivial to add later, so you have no choice but to essentially make a guess and hope it’s right. There’s basically no real alternative. Of course, if it is trivial to defer an abstraction until later, then it’s better to do that. But it is almost definitely not for Clang operators, which cross cut almost every distinct unit of the program (lexing, parsing, etc.) (This is also referenced at some point in the talk itself, though I can’t remember exactly where, but my take is that you can’t really fully understand the ideal architecture to solve a problem before trying to solve it, and in trying to solve it you must make architectural decisions.)