Emacs surprise: C-x C-e sets debug-on-error regardless of what it was set to before. Customise eval-expression-debug-on-error to change it.
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Here's a wonderful example of live programming in an introspectable system like Emacs.
Emacs lets you customise ('advise') any function. Today I advised code evaluation! With a record of code snippets recently executed, I can make my code completion smarter.
If you're not using helpful to explore Emacs functions, you're missing out!
It's now possible to set, toggle and customise variables from within helpful! Helpful will even pull out source code of functions have been redefined by edebug!
