A poll for my @rustlang peeps:
Assume `expr` is long and not a local variable
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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)
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This. Not doing explicit `.map_err(Into::into)` is clutch. If the nestedness of Ok(Some(...)) gets ugly, use an intermediate variable for the result of `expr?` I'd say.
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