Bug #72692 [NEW]: Bad behaviour of AppendIterator with Empty Generator

From: pierrick Operating system: PHP version: 5.6.24 Package: SPL related Bug Type: Bug Bug description:Bad behaviour of AppendIterator with Empty Generator Description: ------------ When giving an new empty generator, AppendIterator will directly throw an Exception "Cannot traverse an already closed generator" even if the given generator is new. Test script: --------------- <?php function createEmptyGen() { if(false) { yield 1; } } $gen = createEmptyGen(); $ai = new AppendIterator(); $ai->append($gen); var_dump(iterator_to_array($gen)); Expected result: ---------------- array(0) { } Actual result: -------------- Fatal error: Uncaught Exception: Cannot traverse an already closed generator in /home/pierrick/php-src/github/foo.php:14 Stack trace: #0 /home/pierrick/php-src/github/foo.php(14): iterator_to_array(Object(Generator)) #1 {main} thrown in /home/pierrick/php-src/github/foo.php on line 14 -- Edit bug report at https://bugs.php.net/bug.php?id=72692&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=72692&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=72692&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=72692&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=72692&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=72692&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=72692&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=72692&r=needscript Try newer version: https://bugs.php.net/fix.php?id=72692&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=72692&r=support Expected behavior: https://bugs.php.net/fix.php?id=72692&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=72692&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=72692&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=72692&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=72692&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=72692&r=dst IIS Stability: https://bugs.php.net/fix.php?id=72692&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=72692&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=72692&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=72692&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=72692&r=mysqlcfg