async-await: [WIP] replace std await! macro with await syntax #1080
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Motivation
await
syntax was implemented in rust-lang/rust#60586, and nightly-2019-05-09 has been released with the changes. Also,await!
macro will be removed in the future.Solution
await
syntax only works in the 2018 edition, so this PR has not replaced some stdawait!
macros yet (it needs to bump the minimum support version).This PR currently uses a way that does not bump the minimum supported version, but this is blocked by
std::r#await!
macro not working (see rust-lang/rust#60660).cc @carllerche @davidbarsky