With bison 3.7, some error message changed and makes the jsquery regression tests fail:

607--- /tmp/autopkgtest-lxc.qv5k86ce/downtmp/build.QH8/src/expected/jsquery.out	2020-07-27 04:40:49.000000000 +0000
608+++ /tmp/autopkgtest-lxc.qv5k86ce/downtmp/build.QH8/src/results/jsquery.out	2020-07-27 04:41:38.828913000 +0000
609@@ -67,7 +67,7 @@
610 ERROR:  bad jsquery representation
611 LINE 1: select '* < 13 AND #.zxc"x" = "true"'::jsquery;
612                ^
613-DETAIL:  syntax error, unexpected STRING_P, expecting $end at or near """
614+DETAIL:  syntax error, unexpected STRING_P, expecting end of file at or near """
615 select 'a < 1'::jsquery;
616  jsquery 
617 ---------
618@@ -1183,7 +1183,7 @@
619 ERROR:  bad jsquery representation
620 LINE 1: select 'a\r = x"\\abcd"'::jsquery AS err;
621                ^
622-DETAIL:  syntax error, unexpected STRING_P, expecting $end at or near """
623+DETAIL:  syntax error, unexpected STRING_P, expecting end of file at or near """
624 --IS
625 select  'as IS boolean OR as is ARRAY OR as is ObJect OR as is Numeric OR as is string'::jsquery;

Full test log: https://salsa.debian.org/postgresql/jsquery/-/jobs/891573