Bug report

PHPStan reports errors for nested while loops.

PHPStan 1.9.2 (and older) does not produce this error, but PHPStan 1.9.3 to 1.9.6 does.

Code snippet that reproduces the problem

https://phpstan.org/r/e7e6df1c-ba29-4fd0-82e7-788f2a202177

<?php declare(strict_types = 1);

$x = 0;

while ($x < 4) { // Comparison operation "<" between 0 and 4 is always true.
	$y = 0;

	while ($y < 6) {
		$y += 1;
	}

	$x += 1;
}

echo 'done'; // Unreachable statement - code above always terminates.

This code produces no errors:

<?php declare(strict_types = 1);

$x = 0;

while ($x < 4) {
	$x += 1;
}

echo 'done';

Expected output

PHPStan should report no errors, but reports two:

Comparison operation "<" between 0 and 4 is always true.
Unreachable statement - code above always terminates.