Regression test

Closes phpstan/phpstan#9850

Author: ondrejmirtes

tests/PHPStan/Rules/Comparison/NumberComparisonOperatorsConstantConditionRuleTest.php

@@ -240,4 +240,10 @@ public function testBug6642(): void
 		$this->analyse([__DIR__ . '/data/bug-6642.php'], []);
 	}
 
+	public function testBug9850(): void
+	{
+		$this->treatPhpDocTypesAsCertain = true;
+		$this->analyse([__DIR__ . '/data/bug-9850.php'], []);
+	}
+
 }

tests/PHPStan/Rules/Comparison/data/bug-9850.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Bug9850;
+
+class CsvImport
+{
+	public function imporContent(): void
+	{
+		$lineCount = 0;
+		$inputArray = ['a', 'b', 'c', 'd', 'e', 'f'];
+		$datasets = [];
+		foreach ($inputArray as $bnn3Line) {
+			++$lineCount;
+			if ($lineCount === 1) {
+				// special treatment for line number 1
+			} else {
+				$datasets[] = $bnn3Line;
+				if (count($datasets) >= 3) {
+					// todo
+				}
+			}
+		}
+	}
+}