Question: Is there no way to put statically defined named functions with all of them having the same signature in a collection type without using &dyn Fn or Box<dyn Fn>? My guess is no just want to make sure
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If the c API takes a void* for user data you can use rust closures with it easily though. https://github.com/diesel-rs/diesel/blob/d3b1ce1db3bc4c419b661a3ad1f4ca5e3b85e20d/diesel/src/sqlite/connection/raw.rs#L143 …
Also leads to the only place ever that a generic is used in argument position and you can't use impl Trait because turbofish is required. https://github.com/diesel-rs/diesel/blob/d3b1ce1db3bc4c419b661a3ad1f4ca5e3b85e20d/diesel/src/sqlite/connection/raw.rs#L93 …
