MAGETWO-89899: Proxy/Interceptor generator does not understand PHP 7.1 syntax

Author: Oleksandr Gorkun

lib/internal/Magento/Framework/Interception/Code/Generator/Interceptor.php

@@ -117,10 +117,10 @@ protected function _getMethodInfo(\ReflectionMethod $method)
                 ],
                 [
                     $method->getName(),
-                    $returnTypeValue === 'void' ? '' : 'return',
+                    $returnTypeValue === 'void' ? '' : ' return',
                     $this->_getParameterList($parameters)
                 ],
-<<<'METHOD_BODY'
+                <<<'METHOD_BODY'
 $pluginInfo = $this->pluginList->getNext($this->subjectType, '%methodName%');
 if (!$pluginInfo) {
    %return% parent::%methodName%(%parameters%);