Bug #80055 [NEW]: Abstract trait methods returning "self" cannot be fulfilled by traits

From: dusk at woofle dot net Operating system: any PHP version: 7.4.10 Package: Class/Object related Bug Type: Bug Bug description:Abstract trait methods returning "self" cannot be fulfilled by traits Description: ------------ If a concrete method implemented by a trait is declared as returning "self", it is considered incompatible with an abstract declaration of that method in another trait. Test script: --------------- trait AbstractTrait { abstract public function selfReturner() : self; } trait ConcreteTrait { public function selfReturner() : self { return $this; } } class Test { use AbstractTrait; use ConcreteTrait; } Expected result: ---------------- The AbstractTrait trait should be satisfied by the implementation provided by ConcreteTrait. Actual result: -------------- Fatal error: Declaration of ConcreteTrait::selfReturner(): ConcreteTrait must be compatible with AbstractTrait::selfReturner(): AbstractTrait -- Edit bug report at https://bugs.php.net/bug.php?id=80055&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=80055&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=80055&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=80055&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=80055&r=needscript Try newer version: https://bugs.php.net/fix.php?id=80055&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=80055&r=support Expected behavior: https://bugs.php.net/fix.php?id=80055&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=80055&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=80055&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=80055&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=80055&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=80055&r=dst IIS Stability: https://bugs.php.net/fix.php?id=80055&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=80055&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=80055&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=80055&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=80055&r=mysqlcfg