Editing code using a concrete syntax tree may seem straightforward, but it's a complex task fraught with challenges. For every command that modifies the code, there's ample room for ambiguity. What if there are multiple legal choices available? How do you create a user experience in Emacs that not only displays the intended changes but also caters to the needs of power users seamlessly? Here I talk about how I've solved that problem in Combobulate.
