Add regression test for #3770

Closes phpstan/phpstan#3770

Author: phpstan-bot

tests/PHPStan/Rules/Functions/CallToFunctionStatementWithoutSideEffectsRuleTest.php

@@ -119,6 +119,24 @@ public function testFirstClassCallables(): void
 		]);
 	}
 
+	public function testBug3770(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-3770.php'], [
+			[
+				'Call to function array_map() on a separate line has no effect.',
+				8,
+			],
+			[
+				'Call to function array_map() on a separate line has no effect.',
+				15,
+			],
+			[
+				'Call to function array_map() on a separate line has no effect.',
+				23,
+			],
+		]);
+	}
+
 	public function testBug11317(): void
 	{
 		$this->analyse([__DIR__ . '/data/bug-11317.php'], [

tests/PHPStan/Rules/Functions/data/bug-3770.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Bug3770;
+
+/** @var array<int, int> $numbers */
+$numbers = [];
+
+array_map(
+	function ($value) {
+		return $value;
+	},
+	$numbers,
+);
+
+array_map(
+	/** @param 1|2|3 $value */
+	function ($value) {
+		return $value;
+	},
+	$numbers,
+);
+
+array_map(
+	/** @param 1|2|3 $value */
+	fn($value) => $value,
+	$numbers,
+);