Discussion
Assertion (A): An LR parser detects a syntax error as soon as it is possible to do so.
Reason (R): It reports an error the moment the input can no longer extend a viable prefix of some right sentential form.
Answer: B
Both are true and the reason gives the mechanism, and this is called the viable prefix property. No incorrect symbol is ever shifted, so the reported position is as close to the actual mistake as any parser can manage.
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