Bug #74607 [NEW]: Traits enforce different inheritance rules

From: mail at pmmaga dot net Operating system: * PHP version: 7.0.19 Package: Class/Object related Bug Type: Bug Bug description:Traits enforce different inheritance rules Description: ------------ When inheriting from an abstract class, a method implemented by a trait does not allow adding a return type. This is allowed when the method is implemented directly in the child class. On the current master (7.2) the same happens when omitting a type-hint. With interfaces the behavior is consistent with or without traits. Test script: --------------- <?php abstract class L1{ abstract function m3($x); } trait L2t{ function m3($x): int{} } class L2 extends L1{ use L2t; } Expected result: ---------------- N/A Actual result: -------------- Fatal error: Declaration of L2t::m3($x): int must be compatible with L1::m3($x) in ... -- Edit bug report at https://bugs.php.net/bug.php?id=74607&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=74607&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=74607&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=74607&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=74607&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=74607&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=74607&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=74607&r=needscript Try newer version: https://bugs.php.net/fix.php?id=74607&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=74607&r=support Expected behavior: https://bugs.php.net/fix.php?id=74607&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=74607&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=74607&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=74607&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=74607&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=74607&r=dst IIS Stability: https://bugs.php.net/fix.php?id=74607&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=74607&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=74607&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=74607&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=74607&r=mysqlcfg