[issue10544] yield expression inside generator expression does nothing

[Ivan Levkivskyi]

Ivan Levkivskyi <levkivskyi at gmail.com> added the comment:

Well, after all I am thinking maybe it is indeed makes sense to ban `yield` inside both sync/async and both comprehensions/generator expressions. Since we already have a smörgåsbord of intuitive behaviors.

This, _together_ with extensive clarification to the docs and error messages can fix the problem.

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