From the docs,
$text: The remaining (unparsed) text. Changes to $text do not propagate out of unsuccessful productions, but do survive successful productions.
So we need to remove from $text what the query parser matches. Also from the docs,
If, however, the text to be matched is passed by reference [...] then any text which was consumed during the match will be removed from the start of [the referenced string].
So it's quite simple:
$TemplateParser = Parse::RecDescent->new(<<'__GRAMMAR__');
template: identifier 'TEMPLATE' '{' statement(s) '}'
statement: expression
| conditional
| loopcontrol
| { $QueryParser->query(\$text) }
__GRAMMAR__
Tested.
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