No matter what kind of PL you are doing, there's no better way to get a feel for how it works than to have an implementation you can play with. These days, it's easier than ever to build a "full featured" language that includes IDE support, beautiful output, and an interactive web playground. Nicholas Matsakis will give an opinionated tour through some of the options available, along with observations about what it's like to develop PL for a living.
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