The lisp macro -> is more powerful than function composition. For example, this is legitimate elisp: (-> 100 (goto-char) (save-excursion))
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Emacs has 25 special forms! I was surprised about save-excursion (presumably perf?) and prog2 (could be a macro!).
Awesome paredit feature of the day: M-? convolves. Before: (progn (save-excursion| (a) (b))) After: (save-excursion (progn (a) (b)))