Allow streaming formatting#6957
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This PR implements streaming formatting via the
--start-markerand--end-markercommand-line options.When both options are supplied, rustfmt reads from stdin streamingly, and detects blocks of Rust code enclosed by the start and end markers. Each block is formatted using the standard format_string mechanism and flushed to stdout immediately, followed by the end marker. This avoids the 30ms startup overhead on Windows for tools invoking rustfmt repeatedly.
An integration test is also included in
tests/rustfmt/main.rsto verify the functionality.