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3b4580f5ce
TParserGet() recurses for some token types, meaning it's possible to drive it to stack overflow. Since this is a minority behavior, I chose to add the check_stack_depth() call to the two places that recurse rather than doing it during every single call. While at it, add CHECK_FOR_INTERRUPTS(), because this can run unpleasantly long for long inputs. Per bug #17995 from Zuming Jiang. This is old, so back-patch to all supported branches. Discussion: https://postgr.es/m/17995-9f20ff3e6389db4c@postgresql.org