Add regression test for #577

Author: jlherren

tests/PHPStan/Rules/Methods/CallStaticMethodsRuleTest.php

@@ -397,4 +397,10 @@ public function testNamedArguments(): void
 		]);
 	}
 
+	public function testBug577(): void
+	{
+		$this->checkThisOnly = false;
+		$this->analyse([__DIR__ . '/data/bug-577.php'], []);
+	}
+
 }

tests/PHPStan/Rules/Methods/data/bug-577.php

@@ -0,0 +1,18 @@
+<?php declare(strict_types = 1);
+
+namespace Bug577;
+
+class Test
+{
+	public static function step1(?int $foo): void
+	{
+		if ($foo > 1) {
+			static::step2($foo);
+		}
+	}
+
+	public static function step2(int $bar): void
+	{
+		var_dump($bar);
+	}
+}