Commits on Sep 26, 2024

1. pythongh-115528: Update language reference for PEP 646 (pythonGH-121181) …

   To recap: the objective is to make starred expressions valid in `subscription`,
   which is used for generics: `Generic[...]`, `list[...]`, etc.
   
   What _is_ gramatically valid in such contexts? Seemingly any of the following.
   (At least, none of the following throw `SyntaxError` in a 3.12.3 REPL.)
   
       Generic[x]
       Generic[*x]
       Generic[*x, y]
       Generic[y, *x]
       Generic[x := 1]
       Generic[x := 1, y := 2]
   
   So introducting
   
       flexible_expression: expression | assignment_expression | starred_item
   
   end then switching `subscription` to use `flexible_expression` sorts that.
   
   But then we need to field `yield` - for which any of the following are
   apparently valid:
   
       yield x
       yield x,
       yield x, y
       yield *x,
       yield *x, *y
   
   Introducing a separate `yield_list` is the simplest way I've been figure out to
   do this - separating out the special case of `starred_item ,`.
   
   (cherry picked from commit 7d3497f)
   
   Co-authored-by: Matthew Rahtz <[email protected]>
   Co-authored-by: Jelle Zijlstra <[email protected]>

   

   2 people authored and miss-islington committed Sep 26, 2024
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