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Oh nice, didn't know about it. (I have migrated from vim to neovim and half of it doesn't work for me yet)

I wonder why this is preferred over codegen (during build), possibly using some kind of annotations?

We've not had any proposals for a design like that. We are open to proposals though! I wrote a blog post detailing the process here: https://lpil.uk/blog/how-to-add-metaprogramming-to-gleam/