Ready to give LWN a try? With a subscription to LWN, you can stay current with what is happening in the Linux and free-software community and take advantage of subscriber-only site features. We are pleased to offer you a free trial subscription, no credit card required, so that you can see for yourself. Please, join us! The traditional structure of a compiler forms a pipeline — parsing, type-checking, optimization, and code-generation, usually in that order. But modern programming languages ha...