Nick Coghlan 8805a4dad2 bpo-42282: Fold constants inside named expressions (GH-23190) ...

* The AST optimiser wasn't descending into named expressions, so
  any constant subexpressions weren't being folded at compile time
* Remove "default:" clauses inside the AST optimiser code to reduce the
  risk of similar bugs passing unnoticed in future compiler changes

2020-11-07 22:35:17 +10:00

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