/** @param list<array<string, mixed>> $input */
	public function sayHello(array $input): void
	{
		// improvement request: phpstan should suggest adding `unset($item)` after the foreach statement
		// only for loops with variable passed by reference
		foreach ($input as &$item) {}

		// this is the problem code: it changes last array element
		// this code is almost certanly reuses variable by mistake
		// and overwrites the last array element by mistake
		$item = 'foo';

		// bug: phpstan doesn't detect the $input type is changed now
		\PHPStan\dumpType($input);
	}