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Jun 12, 2019 at 23:25
TIL eager macro expansion can mean very different things. Rust macros must expand to valid code, so eager macro expansion allows illegal intermediate states: https://docs.rs/eager/0.1.0/eager/macro.eager.html#macro-expansions Elisp macros are expanded at runtime unless expansion is eager:
eager in eager - Rust
Emulates eager expansion of macros.
Emacs 24.3’s Killer Feature: Eager Macro-Expansion
Looks like this change has gone largely unnoticed, aside from occasional bug reports when it failed and emitted a warning.

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Feb 18, 2019 at 09:47
I've written a lot of lisp, including a respectable number of macros, and I don't think I've ever been caught out by hygiene. I've definitely written broken macros that expanded to the wrong thing though.