Add more regression tests

Author: herndlm

tests/PHPStan/Rules/Functions/CallToFunctionParametersRuleTest.php

@@ -1625,6 +1625,15 @@ public function testBug9399(): void
 		$this->analyse([__DIR__ . '/data/bug-9399.php'], []);
 	}
 
+	public function testBug9559(): void
+	{
+		if (PHP_VERSION_ID < 80000) {
+			$this->markTestSkipped('Test requires PHP 8.0');
+		}
+
+		$this->analyse([__DIR__ . '/data/bug-9559.php'], []);
+	}
+
 	public function testBug9923(): void
 	{
 		if (PHP_VERSION_ID < 80000) {

tests/PHPStan/Rules/Functions/data/bug-9559.php

@@ -0,0 +1,12 @@
+<?php declare(strict_types = 1);
+
+namespace Bug9559;
+
+class ZZ {};
+function foo(?ZZ $z = null, ?int $a = 0, ?string $b = "x"): string { return "bah"; }
+
+function doit(int $x): void {
+	$call = [];
+	if ($x) $call['a'] = 45;
+	foo(...array_merge($call, [ "b" => "3" ]));
+}

tests/PHPStan/Rules/Methods/ReturnTypeRuleTest.php

@@ -882,6 +882,11 @@ public function testBug8632(): void
 		$this->analyse([__DIR__ . '/data/bug-8632.php'], []);
 	}
 
+	public function testBug7857(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-7857.php'], []);
+	}
+
 	public function testBug8879(): void
 	{
 		$this->analyse([__DIR__ . '/data/bug-8879.php'], []);

tests/PHPStan/Rules/Methods/data/bug-7857.php

@@ -0,0 +1,17 @@
+<?php declare(strict_types = 1);
+
+namespace Bug7857;
+
+class Paginator
+{
+	/**
+	 * @return array{page: int, perPage?: int}
+	 */
+	public function toArray(int $page, ?int $perPage): array
+	{
+		return array_merge(
+			['page' => $page],
+			$perPage !== null ? ['perPage' => $perPage] : []
+		);
+	}
+}