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Upon checking the RSS feed for the Special:Newpages page, I found that the file SpecialNewPages.php contains an 
error at line 95 (as is indicated in the RSS feed's erroneous content).

The line reads
return '<p>' . htmlspecialchars( wfMsg( 'summary' ) ) . ': ' . $text . "</p>\n<hr />\n<div>" .

the variable $text is undefined. My guess is that this should be the value from the rev_comment column in the 
revision table. That lead me to change the line to: 

return '<p>' . htmlspecialchars( wfMsg( 'summary' ) ) . ': ' . $revision->getComment() . "</p>\n<hr />\n<div>" .

Is this a correct guess, or should another value from $revision be taken?