I've often found reading diffs tricky when I have to scroll up to see what file I'm in, then back down to the changes I'm interested in.
In difftastic, I'm experimenting with printing the file name on every hunk displayed.
miniblog.
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I really like interpreters that allow you to inspect values, such as the JS console in a browser or Common Lisp with sly.
Otherwise you end up repeatedly pretty printing values. It's unnecessary.
Shower thought: Printing runtime values is far more useful for product types than sum types.
For a struct it's useful to see all the fields, but for a nullable int it's less useful to see 123.
Reporting a type error is fairly straightforward: making a good suggestion of how to fix it is much harder. I was really impressed with rustc's handling of Path printing here.
