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gh-153568: Make the parser's per-rule stack check an inline comparison (#153573)
* gh-153568: Make the parser's per-rule stack check an inline comparison The parser now caches the thread state and stack limit up front and only falls back to the full check when the stack is nearly exhausted. * fixup! gh-153568: Make the parser's per-rule stack check an inline comparison * fixup! gh-153568: Make the parser's per-rule stack check an inline comparison
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‎Misc/NEWS.d/next/Core_and_Builtins/2026-07-11-14-58-24.gh-issue-153568.stackchk.rst‎

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Speed up the parser by turning its per-rule C-stack check into a single
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inline comparison.

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