#Emacs tip: if you want to discard TAGS tables you've been using, use tags-reset-tags-tables (I reimplemented this before knowing about it!)
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Emacs is huge. Today I realised that I had reimplemented a built-in command, and even given in the same name!
Crux https://github.com/bbatsov/crux is a fantastic collection of Emacs conveniences. You've probably reimplemented several of them (I have)!
Turns out I've inadvertently reimplemented GNU Stow in my dotfiles repo. Nice to know I can switch to a widely used tool.