Added regression test

Author: staabm

tests/PHPStan/Analyser/NodeScopeResolverTest.php

@@ -1401,6 +1401,7 @@ public function dataFileAsserts(): iterable
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-7291.php');
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-10264.php');
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/conditional-vars.php');
+		yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-5961.php');
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-10189.php');
 	}
 

tests/PHPStan/Analyser/data/bug-5961.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace Bug5961;
+
+use function PHPStan\Testing\assertType;
+
+function doFoo() {
+	assertType('"Foo \r\n Bar"', "Foo \r\n Bar");
+	assertType('"Foo \n Bar"', "Foo \n Bar");
+	assertType('"Foo \r Bar"', "Foo \r Bar");
+}