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Fixed FileGenerator::setUse() to ignore already added uses. #3317
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Multiple calls to setUse() with the same parameters was leading to multiple identical use statements being inserted in the generated file. This was causing a PHP Fatal error 'name is already in use' in the generated code.
This patch overcomes this by first testing whether the 'use' has been added to the $uses array. If it has, then it ignores it (doesn't add it again).