miniblog.

It's confusing how 'REPL' refers to two different UIs: A CLI like IPython or Julia, where things like multiline editing and syntax highlighting need careful implementation. An editor protocol like SLIME or CIDER where multiline editing is a total non-issue.

ASTs typically discard comments, and that's usually what you want. The only time (AFAICS) that preserving comments is useful is for writing a code formatter. Could you write a formatter in terms of a list of lexemes? A CST is a non-trivial bit of code for one use case.

Today I learnt that A* doesn't work for an arbitrary non-planar graph, you need additional structure: https://stackoverflow.com/q/26568552/509706 This matches my experience with difftastic so far. The graph is non-planar and my best heuristic only matches Dijkstra perf in typical cases.