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May 29, 2016 at 19:34
Wow, Pharo has resumable exceptions! Explains why 'define method and continue' just works. (CL was the only lang I was aware of with this.)

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Jun 25, 2018 at 15:04
A nice improvement in Emacs 26.1: the manual explains the exact difference between syntax-ppss and parse-partial-sexp:
Doc amendment for syntax-ppss. · emacs-mirror/emacs@913808e
Doc amendment for syntax-ppss. · emacs-mirror/emacs@913808e
* doc/elisp/syntax.texi (Position Parse): Note, twice, that syntax-ppss is equivalent to parse-partial-sexp from the beginning of THE VISIBLE PART OF the buffer. Final part of the fix for bug #22983.
Jun 14, 2018 at 22:24
Really cute video demo of the hypertext documentation in Symbolics Lisp Machines: https://youtu.be/7DxYj32cvoE The speaker carefully explains why links are a good thing! It also lists history in a pane (rather than a back button) and has a stronger notion of navigating hierarchies.
May 23, 2017 at 20:20
The Smalltalk Blue Book https://stephane.ducasse.free.fr/FreeBooks/BlueBook/Bluebook.pdf is great (introduces the language, explains usage) but also has this cute mouse explanation!
Photo