https://bugzilla.wikimedia.org/show_bug.cgi?id=73526

            Bug ID: 73526
           Summary: {{#widget}} makes Parsoid worker die
           Product: Parsoid
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: Unprioritized
         Component: General
          Assignee: parsoid-t...@wikimedia.org
          Reporter: kel...@kiwix.org
                CC: elitr...@gmail.com, jforres...@wikimedia.org,
                    ssas...@wikimedia.org
       Web browser: ---
   Mobile Platform: ---

The use of the #widget keyword (introduced by
https://www.mediawiki.org/wiki/Extension:Widgets) makes Parsoid worker die.

Here for example with a git master (98387c2e8f3e5512045c0f762fca728795ebead0)
and this wikicode:

===
{{#widget:foobar}}
===

I get

===
ApiRequest { method: 'POST',
  form: 
   { format: 'json',
     action: 'expandtemplates',
     prop: 'wikitext|categories',
     text: '{{#widget:foobar}}',
     title: 'Main_Page' },
  followRedirect: true,
  uri: 'http://devwiki.wikimedia.org.uk/w/api.php',
  timeout: 30000,
  proxy: undefined,
  strictSSL: true,
  headers: { 'User-Agent': 'Parsoid/0.1', Connection: 'close' } }
[fatal][devwiki/Main_Page?oldid=156] Cannot read property 'length' of undefined
TypeError: Cannot read property 'length' of undefined
    at peg$c379 (eval at <anonymous>
(/var/www/parsoid/lib/mediawiki.tokenizer.peg.js:89:38), <anonymous>:1356:61)
    at peg$parseeof (eval at <anonymous>
(/var/www/parsoid/lib/mediawiki.tokenizer.peg.js:89:38), <anonymous>:14738:12)
    at peg$parsetlb (eval at <anonymous>
(/var/www/parsoid/lib/mediawiki.tokenizer.peg.js:89:38), <anonymous>:2007:12)
    at peg$parsetoplevelblock (eval at <anonymous>
(/var/www/parsoid/lib/mediawiki.tokenizer.peg.js:89:38), <anonymous>:1909:12)
    at Object.parse (eval at <anonymous>
(/var/www/parsoid/lib/mediawiki.tokenizer.peg.js:89:38), <anonymous>:17872:18)
    at PegTokenizer.tokenizeAsync
(/var/www/parsoid/lib/mediawiki.tokenizer.peg.js:206:24)
    at PegTokenizer._processText
(/var/www/parsoid/lib/mediawiki.tokenizer.peg.js:180:8)
    at PegTokenizer.process
(/var/www/parsoid/lib/mediawiki.tokenizer.peg.js:119:7)
    at ParserPipeline.process (/var/www/parsoid/lib/mediawiki.parser.js:485:21)
    at Object.Util.processContentInPipeline
(/var/www/parsoid/lib/mediawiki.Util.js:1112:12)
[warning][master][15113] worker 15465 died (1), restarting.
===

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