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I have partially resolved the issue I mentioned in my #EmacsConf2025 presentation, regarding the closure of a lambda not correctly capturing it’s environment.

I say “partially” resolved because although my current solution results in correct program behavior, it does not consider let-bound variables inside of the closure. So variables declared locally to the closure using the let keyword will mask variables of the same name in the closure environment. A correct implementation will simply not include those masked variables in the closure environment at all. This can sometimes impact garbage collection, since a closure may be holding a variable which retains a large amount of memory, but that variable not accessible anywhere since it is masked by the let-bound variables in the closure.

However, I am eager to keep things moving, so I am merging this PR and opening a new issue to resolve the let-bindings problem later. To find out more, see issue #62 on Codeberg.

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— will be live in about 5 minutes.

https://emacsconf.org/2025/watch/dev

Questions can be posted to this live chat: https://pad.emacsconf.org/2025-schemacs

EDIT: Thanks for all the great questions everyone. It is so encouraging for me to see that there is so much interest in this project, it really keeps me motivated to keep working on it.

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