so am I right in thinking that every rust function with a generic return, e.g. collect(), sum(), into(), is implemented by constraining the return to implement some trait and then just calling that trait?
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Pretty much. Or it takes a closure as an argument (which I guess is technically still what you're saying)
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I may write up how I came to understand this as a blog post
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You may find this code mildly interesting as well: https://github.com/diesel-rs/diesel/blob/master/diesel/src/sqlite/connection/raw.rs#L93-L96 … -- only case I've ever needed explicit turbofish for a generic argument and not the return type.
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