A poll for my @rustlang peeps:
Assume `expr` is long and not a local variable
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`Ok(Some(expr?))`, but only because it does error conversion, and in a lot of cases, that's what you want. If I don't need the error conversion, then `http://expr.map (Some)`.
Ah good point, I hadn't really considered the case where you actually have to use `?` (or add `.map_err(Into::into)` which I've done in the past)
