Description:
------------
We get these strange errors when trying to require() or include() some classes.
I managed to extract some script part enough to reproduce it.

Test script:
---------------
php.ini:
opcache.enable_cli=1

narrowing.php:
<?php
class TestClass
{

	public function test()
	{
		$seqs = [];
		foreach ([] as $row) {
			foreach ($seqs as $i => $seq)
				$seqs[$i][] = 0;
			$seqs[] = 0;
		}
	}

}

php -c php.ini narrowing.php


Expected result:
----------------
no warning/error

Actual result:
--------------
Warning: Narrowing occurred during type inference. Please file a bug report on bugs.php.net in Unknown on line 0