"In my own tests, compiled Elisp with lexical scope enabled is about 10% to 15% faster than with the default dynamic scope." Worth knowing!
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NLL (non-lexical lifetimes) now landing in Rust!
Emacs tip: add lexical-binding: t to your elisp files. This makes closures easier to reason about and lets the byte compiler find more bugs.
Macros where you have to specify a var name are really clean. They have few hygiene issues, and work with both lexical and dynamic binding!