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Fair enough, I misled myself.
However, and I feel like I'm getting really picky here, but it still doesn't fulfill the paragraph I quoted:
 def application(environ, start_response):
 start_response('200 OK',
 [('Content-type', 'text/plain')])
 yield b''
 try:
 # produce an exception tuple, so we can re-call s_r
 raise RuntimeError
 except RuntimeError:
 # Headers shouldn't have been sent, but they were
 # so this will throw:
 start_response('200 OK',
 [('Content-type', 'text/plain')],
 sys.exc_info())
 yield b'error data or whatever'
But if async support a foregone conclusion anyway, is it worth bothering complying with that odd requirement?