Anyone know of a convenient want to cache some expensive constant for a macro within a function? I am generating said macro from within another macro which generates something like

#`(lambda () (define-for-syntax table (some-lookup-table...)) (define-syntax (helper-macro-using-table stx) ...) rest-of-lambda ...) I can’t just do an outer begin since this is likely not going to be called at the top/module level. Would syntax-local-value work in the general case for something like this? Also, if this is unsafe for some reason, would be interested to know why.

Lifting is often used for this

See begin-lifted

Thanks so much, that seems to mostly resolve what I was looking for.