"#emacs Where you are limited only by your imagination and max-specpdl-size" -- current topic on the always brilliant #emacs IRC channel
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Today I learnt what specpdl means in Emacs internals!
Special variable PushDown List.
Special variable means a dynamically bound variable, and pushdown list means a stack.
`regexp-opt` is a great function, but it sets max-lisp-eval-depth and max-specpdl-size to 10,000! Seems rather crude.