I haven't really dug into that stuff to know why it's better/worse than do, but do hardly seems like a big win.
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In seriousness, do notation kinda sucks since it can't appear in expression position.
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e.g. match thing { Ok(x) => x; Err(error) => return Err(error) }
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Yes, that's exactly what `try!` does (with an `into` call on the error in case there's conversion)
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Since Rust has nonlocal branches as exprs, can't you already macro away the failure/await edge?
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That's what we do today, but it only works with `Result`.
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