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<?php interface RouteManagerInterface { } interface ThemeManagerInterface { public function getActiveTheme(RouteMatchInterface $route_match = NULL); } class SomeOtherThemeManager implements ThemeManagerInterface { public function getActiveTheme() { echo 'yo!' . PHP_EOL; } } $c = new SomeOtherThemeManager(); $c->getActiveTheme();
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Declaration of SomeOtherThemeManager::getActiveTheme() must be compatible with ThemeManagerInterface::getActiveTheme(?RouteMatchInterface $route_match = null) in /in/JeoS4 on line 10
Process exited with code 255.

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