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Skip immortal interning for replay-only identifiers and dotted names. The parser can then release those strings after each trial.
Separate candidate collection, trial acceptance, and hint construction. Keep trial allocation and cleanup together, and restore the original syntax error through one exit path.
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Move keyword typo hints into the parser and attach the result to
SyntaxError. Replay private token copies through the grammar, with one replacement per trial. Release trial identifiers with their arena. Remove source recompilation and statement-location metadata from traceback.Search the complete logical statement and count adjacent letter swaps as one edit. Preserve comma diagnostics and support typos that spell another keyword.
Limit the search to 256 KiB, 32,768 tokens, 32 candidates, and 5 million rule entries across all trials. Keep the normal parser's fast stack check.
Fixes #159672.