public void recover(RecognitionException re) {
		//System.out.println("consuming char "+(char)input.LA(1)+" during recovery");
		//re.printStackTrace();
		// TODO: Do we lose character or line position information?
		_input.consume();
	}
Lexers can normally match any char in it's vocabulary after matching
 a token, so do the easy thing and just kill a character and hope
 it all works out.  You can instead use the rule invocation stack
 to do sophisticated error recovery if you are in a fragment rule.
runtime/Java/src/org/antlr/v4/runtime/Lexer.java