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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Yup. To elaborate, fn types in Rust are the same concept as a C function pointer (Option<extern "C" fn()> is what you'd use for ffi if the pointer could be null).
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 …
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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 …
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