Added regression test

Author: staabm

tests/PHPStan/Analyser/nsrt/pr-5447.php

@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PR5447Regression;
+
+use function PHPStan\Testing\assertType;
+
+class Foo
+{
+
+	public function doFoo(): void
+	{
+		$device = $this->nullable();
+		if ($device === null) {
+			$device = 1;
+			try {
+				$device = $this->throwsException();
+			} catch (\Exception) {
+				$device = $this->nullable();
+				assertType('int|null', $device);
+			}
+		}
+	}
+
+	public function nullable(): ?int
+	{
+
+	}
+
+	/** @throws \Exception */
+	private function throwsException(): int
+	{
+
+	}
+
+}