Create bug-12087c.php

Author: staabm

tests/PHPStan/Rules/Comparison/data/bug-12087c.php

@@ -0,0 +1,22 @@
+<?php // lint >= 8.1
+
+namespace Bug12087c;
+
+enum Button: int
+{
+	case On = 1;
+
+	case Off = 0;
+}
+
+function doFoo() {
+	$value = 10;
+
+	is_null($foo = $value = Button::tryFrom($value));
+}
+
+function doFoo2() {
+	$value = 10;
+
+	is_null($foo ??= Button::tryFrom($value));
+}