The index into the input stream where the last error occurred.
This is used to prevent infinite loops where an error is found
but no token is consumed during recovery...another error is found,
ad nauseum. This is a failsafe mechanism to guarantee that at least
one token/tree node is consumed for two errors.
The index into the input stream where the last error occurred. This is used to prevent infinite loops where an error is found but no token is consumed during recovery...another error is found, ad nauseum. This is a failsafe mechanism to guarantee that at least one token/tree node is consumed for two errors.