Add rule test verifying no binary operation error for DateInterval::format('%a') * 60

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: phpstan-bot

tests/PHPStan/Rules/Operators/InvalidBinaryOperationRuleTest.php

@@ -853,4 +853,9 @@ public function testBug10349(): void
 		]);
 	}
 
+	public function testBug1452(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-1452.php'], []);
+	}
+
 }

tests/PHPStan/Rules/Operators/data/bug-1452.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace BugRuleTest1452;
+
+use DateTimeImmutable;
+
+function doFoo(): void {
+	$dateInterval = (new DateTimeImmutable('now -60 minutes'))->diff(new DateTimeImmutable('now'));
+	$minutes = $dateInterval->format('%a') * 60;
+}