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Improvement
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Resolution: Fixed
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Minor
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2.9, 3.0
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MOODLE_29_STABLE, MOODLE_30_STABLE
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MOODLE_30_STABLE
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php7_reserved_words
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"null" has become a reserved word in PHP7, meaning it cannot be used for a class name, as is done by \core\progress\null, or a syntax error occurs.
Here is a change renaming the class to 'none'.