Bug #79927 [NEW]: Generator doesn't throw exception after multiple yield from iterable

From: Date: Mon, 03 Aug 2020 21:14:46 +0000
Subject: Bug #79927 [NEW]: Generator doesn't throw exception after multiple yield from iterable
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-228396@lists.php.net to get a copy of this message 
From:             roxblnfk at yandex dot com
Operating system: any
PHP version:      7.4.8
Package:          Scripting Engine problem
Bug Type:         Bug
Bug description:Generator doesn't throw exception after multiple yield from iterable

Description:
------------
A generator that yields values from an array does not throw an exception
when calling the rewind method after multiple yields from same yield
construction.

Can also be seen at https://3v4l.org/NZ77U

Test script:
---------------
<?php

$generator = (static function () {
    yield from [1,2,3];
})();

$generator->next();
$generator->next();
$generator->rewind();
echo $generator->current(); # 3

Expected result:
----------------
RuntimeException on line $generator->rewind();

Actual result:
--------------
3

-- 
Edit bug report at https://bugs.php.net/bug.php?id=79927&edit=1
-- 
Fix committed:                    https://bugs.php.net/fix.php?id=79927&r=fixed
Fixed in release:                 https://bugs.php.net/fix.php?id=79927&r=alreadyfixed
Need backtrace:                   https://bugs.php.net/fix.php?id=79927&r=needtrace
Need Reproduce Script:            https://bugs.php.net/fix.php?id=79927&r=needscript
Try newer version:                https://bugs.php.net/fix.php?id=79927&r=oldversion
Not developer issue:              https://bugs.php.net/fix.php?id=79927&r=support
Expected behavior:                https://bugs.php.net/fix.php?id=79927&r=notwrong
Not enough info:                  https://bugs.php.net/fix.php?id=79927&r=notenoughinfo
Submitted twice:                  https://bugs.php.net/fix.php?id=79927&r=submittedtwice
register_globals:                 https://bugs.php.net/fix.php?id=79927&r=globals
PHP version support discontinued: https://bugs.php.net/fix.php?id=79927&r=phptooold
Daylight Savings:                 https://bugs.php.net/fix.php?id=79927&r=dst
IIS Stability:                    https://bugs.php.net/fix.php?id=79927&r=isapi
Install GNU Sed:                  https://bugs.php.net/fix.php?id=79927&r=gnused
Floating point limitations:       https://bugs.php.net/fix.php?id=79927&r=float
No Zend Extensions:               https://bugs.php.net/fix.php?id=79927&r=nozend
MySQL Configuration Error:        https://bugs.php.net/fix.php?id=79927&r=mysqlcfg

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