view .clang-format @ 44751:94cace4b80ea

rust-chg: reimplement run_command operation as async function

The crafted state machine is no longer needed thanks to async/await.
The state machine is basically rewritten as follows:

 - Ready(..) -> return ..
 - PollAgain(..) -> run .. and await
 - Err(..) -> return Err(..)

Differential Revision: https://phab.mercurial-scm.org/D8445

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