Can't parse postgresql grammar and missing error location about jison

[mingodad]

Going through the stack trace and adding this line here (dist/cli-cjs-es5.js:14994:19) :

        if (!chk_g) {
            try {
                chk_g = ebnfParser.parse(grammar, options);
            } catch (e) {
                ...
                console.log(ebnfParser.bnf_parser.parser.__error_infos); ////!!!! inside here it's the  line: 4465
                throw err;
            }
        }

But probably there is a better way to show the offending line number.

[mingodad]

Here is the original rule:

opt_existing_window_name:
	ColId	{ $opt_existing_window_name = $ColId; }
	| /*EMPTY*/				%prec Op	{ $opt_existing_window_name = NULL; }
		;

And here the naked rule:

opt_existing_window_name :
	ColId
	| %prec Op /*14L*/ /*empty*/
	;

Somehow byacc/bison manage to associate precedence to empty rules.