RFC: rough draft of Python-style generators for elisp

[Daniel Colascione]

Over at https://github.com/dcolascione/elisp-generators, I have a
pure-elisp implementation of Python-style generators for elisp.
Perhaps the feature is best illustrate by example:

(defgenerator mygen (i)
  (yield 1)
  (yield i)
  (yield 3))

(let ((gen (mygen 100)))
  (list  (funcall gen)
         (funcall gen)
         (funcall gen)))

-> (1 100 3)

Yields can appear in arbitrary code:

(defgenerator mygen2 (lim)
  (loop for x from 0 to lim do (yield x)))

The package works by rewriting elisp into continuation-passing form
and closing over the resulting continuations with a driver loop that
transitions from one continuation-state to the next. After the last
yield, the facility signals generator-ended.

Please take a look. It'd be nice if there were cl-loop extensions to
iterate over the things, and if generators were available with regular
defun the way yield is available with regular "def" in Python.

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