Thank you, I'd not seen this before. I have always been interested in compiler design having not been put off it by doing a computer science degree, but, havin

Thank you, I'd not seen this before. I have always been interested in compiler design having not been put off it by doing a computer science degree, but, having not done the degree I've also never learned anything about it. This looks like it should help. Although, I was very confused by the first couple of sentences - the author apologises for their global variables, and not knowing which part of the compiler they're talking about I don't know if they means they're going to implement kaleidoscope without any notion of scope, and just make everything global, or if they're just talking about the parser code. It's quite clear soon after that it's the latter, but it makes it difficult to read the introduction!