Fix spurious parse failures (Error::IncompleteStream)#70
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We have a stress test CI run, using multer, that fails spuriously (1 every ~100 runs) with multithreaded tokio runtimes.
This patch fixes it.
The issue is that if the call to state.buffer.poll_stream(cx)?; drains the full stream to completion, the buffer content is not considered anymore, as .eof is set because the underlying stream ended, not that the buffer is empty.
Credit to @wngr for finding this issue.