sync abstract method
This method provides the error handler with an opportunity to handle syntactic or semantic errors in the input stream before they result in a RecognitionException.
The generated code currently contains calls to {@link #sync} after entering the decision state of a closure block ({@code (...)*} or {@code (...)+}).
For an implementation based on Jim Idle's "magic sync" mechanism, see {@link DefaultErrorStrategy#sync}.
@see DefaultErrorStrategy#sync
@param recognizer the parser instance @ if an error is detected by the error strategy but cannot be automatically recovered at the current state in the parsing process
Implementation
void sync(Parser recognizer);