Miss Islington (bot) 384c6d72d9 bpo-37947: Avoid double-decrement in symtable recursion counting (GH-15593) ...

With `symtable_visit_expr` now correctly adjusting the recursion depth for named
expressions, `symtable_handle_namedexpr` should be leaving it alone.

Also adds a new check to `PySymtable_BuildObject` that raises `SystemError`
if a successful first symbol analysis pass fails to keep the stack depth
accounting clean.
(cherry picked from commit 06145230c8)

Co-authored-by: Nick Coghlan <ncoghlan@gmail.com>

2019-08-29 06:46:20 -07:00

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