Added regression test

Author: staabm

tests/PHPStan/Rules/Methods/CallMethodsRuleTest.php

@@ -3514,4 +3514,18 @@ public function testBug12544(): void
 		]);
 	}
 
+	public function testBug12422(): void
+	{
+		if (PHP_VERSION_ID < 80100) {
+			self::markTestSkipped('Test requires PHP 8.1.');
+		}
+
+		$this->checkThisOnly = false;
+		$this->checkNullables = true;
+		$this->checkUnionTypes = true;
+		$this->checkExplicitMixed = true;
+
+		$this->analyse([__DIR__ . '/data/bug-12422.php'], []);
+	}
+
 }

tests/PHPStan/Rules/Methods/data/bug-12422.php

@@ -0,0 +1,28 @@
+<?php // lint >= 8.1
+
+namespace Bug12422;
+
+enum MyEnum
+{
+	case A;
+	case B;
+}
+
+class MyClass
+{
+	public function fooo(): void
+	{
+	}
+}
+
+function test(MyEnum $enum, ?MyClass $bar): void
+{
+	if ($enum === MyEnum::A && $bar === null) {
+		return;
+	}
+
+	match ($enum) {
+		MyEnum::A => $bar->fooo(),
+		MyEnum::B => null,
+	};
+}