Seeing an uptick of these.
https://logstash.wikimedia.org/app/kibana#/doc/logstash-*/logstash-2018.09.27/parsoid?id=AWYcvl14z9bxnQJdcijP&_g=h@44136fa
```
AssertionError: Template range without arginfo.
at Console.assert (console.js:95:23)
at findTopLevelNonOverlappingRanges (/srv/deployment/parsoid/deploy-cache/revs/0272096587ddfc6d0fb66ab2f6e44f9668cbbf35/src/lib/wt2html/pp/processors/wrapTemplates.js:498:12)
at wrapTemplatesInTree (/srv/deployment/parsoid/deploy-cache/revs/0272096587ddfc6d0fb66ab2f6e44f9668cbbf35/src/lib/wt2html/pp/processors/wrapTemplates.js:1020:15)
at Object.wrapTemplates [as proc] (/srv/deployment/parsoid/deploy-cache/revs/0272096587ddfc6d0fb66ab2f6e44f9668cbbf35/src/lib/wt2html/pp/processors/wrapTemplates.js:1037:2)
at DOMPostProcessor.<anonymous> (/srv/deployment/parsoid/deploy-cache/revs/0272096587ddfc6d0fb66ab2f6e44f9668cbbf35/src/lib/wt2html/DOMPostProcessor.js:606:17)
at next (native)
at tryCatchNext (/srv/deployment/parsoid/deploy-cache/revs/0272096587ddfc6d0fb66ab2f6e44f9668cbbf35/node_modules/prfun/lib/index.js:783:28)
at continuer (/srv/deployment/parsoid/deploy-cache/revs/0272096587ddfc6d0fb66ab2f6e44f9668cbbf35/node_modules/prfun/lib/index.js:800:24)
at callback (/srv/deployment/parsoid/deploy-cache/revs/0272096587ddfc6d0fb66ab2f6e44f9668cbbf35/node_modules/prfun/lib/index.js:812:43)
at /srv/deployment/parsoid/deploy-cache/revs/0272096587ddfc6d0fb66ab2f6e44f9668cbbf35/node_modules/prfun/lib/index.js:814:9
at tryCatch2 (/srv/deployment/parsoid/deploy-cache/revs/0272096587ddfc6d0fb66ab2f6e44f9668cbbf35/node_modules/babybird/lib/promise.js:48:12)
at PrFunPromise.Promise (/srv/deployment/parsoid/deploy-cache/revs/0272096587ddfc6d0fb66ab2f6e44f9668cbbf35/node_modules/babybird/lib/promise.js:458:15)
at new PrFunPromise (/srv/deployment/parsoid/deploy-cache/revs/0272096587ddfc6d0fb66ab2f6e44f9668cbbf35/node_modules/prfun/lib/index.js:100:21)
at DOMPostProcessor.doPostProcess (/srv/deployment/parsoid/deploy-cache/revs/0272096587ddfc6d0fb66ab2f6e44f9668cbbf35/node_modules/prfun/lib/index.js:797:21)
at emitOne (events.js:96:13)
at TreeBuilder.emit (events.js:188:7)
```
@ssastry points them at,
https://gerrit.wikimedia.org/r/c/mediawiki/services/parsoid/+/440020
or,
https://gerrit.wikimedia.org/r/c/mediawiki/services/parsoid/+/446985