Req #73010 [NEW]: Can't override interfaces' method return type with its subtypes

From: alan dot bem at gmail dot com Operating system: PHP version: 7.1.0RC1 Package: Class/Object related Bug Type: Feature/Change Request Bug description:Can't override interfaces' method return type with its subtypes Description: ------------ Affected PHP versions: 7.0.0 - 7.1.0beta3 When implementing interfaces, it is impossible to override return types declarations with their (return types) subtypes/implementations although it is perfectly fine with LSP. Test script: --------------- https://3v4l.org/MgU9b Now I get error: "Fatal error: Declaration of CustomerFactory::create(): Customer must be compatible with AggregateRootFactory::create(): AggregateRoot in /file/path on line 15" I expect: Customer type is implementation of AggregateRoot and it should work perfectly fine. -- Edit bug report at https://bugs.php.net/bug.php?id=73010&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=73010&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=73010&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=73010&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=73010&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=73010&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=73010&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=73010&r=needscript Try newer version: https://bugs.php.net/fix.php?id=73010&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=73010&r=support Expected behavior: https://bugs.php.net/fix.php?id=73010&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=73010&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=73010&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=73010&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=73010&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=73010&r=dst IIS Stability: https://bugs.php.net/fix.php?id=73010&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=73010&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=73010&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=73010&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=73010&r=mysqlcfg