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Bug #79616 Wrong behavior of Generator close when nesting "yield from"
Submitted: 2020-05-21 10:33 UTC Modified: 2020-05-21 10:37 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: jeremy at derusse dot com Assigned:
Status: Duplicate Package: Unknown/Other Function
PHP Version: 7.4.6 OS: Linux
Private report: No CVE-ID: None
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From: jeremy at derusse dot com
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 [2020-05-21 10:33 UTC] jeremy at derusse dot com
Description:
------------
Since php 7.4.6, When nesting several `yield from`, the `\Generator::valid` methods return true while the Generator stay open after the last item. (calling `Generator::valid` return once true after the last item.

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

function foo()
{
    yield from ['foo', 'bar'];
}

function bar()
{
    yield from foo();
}

function countGenerator($generator)
{
    for ($count = 0; $generator->valid(); $generator->next()) {
        ++$count;
    }

    return $count;
}

var_dump(countGenerator(foo()));
var_dump(countGenerator(bar()));


Expected result:
----------------
int(2)
int(2)


Actual result:
--------------
int(2)
int(3)


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 [2020-05-21 10:37 UTC] nikic@php.net
-Status: Open +Status: Duplicate
 [2020-05-21 10:37 UTC] nikic@php.net
Duplicate of bug #79600.
 
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