RequiredPhpVersionVisitor: report native union types as requiring PHP 8.0 (#5872)

Co-authored-by: VincentLanglet <9052536+VincentLanglet@users.noreply.github.com>

Author: phpstan-bot

build/PHPStan/Build/RequiredPhpVersionVisitor.php

@@ -67,6 +67,7 @@ public function enterNode(Node $node): ?Node
 		}
 
 		if ($node instanceof Node\UnionType) {
+			$this->require(self::PHP_8_0, 'union types', $node);
 			foreach ($node->types as $innerType) {
 				if ($innerType instanceof Node\IntersectionType) {
 					$this->require(self::PHP_8_2, 'disjunctive normal form types', $innerType);

tests/PHPStan/Analyser/data/bug-9860.php

@@ -1,4 +1,4 @@
-<?php declare(strict_types = 1);
+<?php declare(strict_types = 1); // lint >= 8.0
 
 namespace Bug9860;
 

tests/PHPStan/Analyser/nsrt/bug-11703.php

@@ -1,5 +1,5 @@
-<?php declare(strict_types = 1);
-
+<?php // lint >= 8.0
+declare(strict_types = 1);
 namespace Bug11703;
 
 use function PHPStan\Testing\assertType;

tests/PHPStan/Analyser/nsrt/bug-12125.php

@@ -1,5 +1,5 @@
-<?php declare(strict_types = 1);
-
+<?php // lint >= 8.0
+declare(strict_types = 1);
 namespace Bug12125;
 
 use ArrayAccess;

tests/PHPStan/Analyser/nsrt/bug-13358.php

@@ -1,5 +1,5 @@
-<?php declare(strict_types = 1);
-
+<?php // lint >= 8.0
+declare(strict_types = 1);
 namespace Bug13358;
 
 use function PHPStan\Testing\assertType;

tests/PHPStan/Analyser/nsrt/bug-14319.php

@@ -1,4 +1,4 @@
-<?php
+<?php // lint >= 8.0
 
 namespace Bug14319;
 

tests/PHPStan/Analyser/nsrt/bug-14710.php

@@ -1,5 +1,5 @@
-<?php declare(strict_types = 1);
-
+<?php // lint >= 8.0
+declare(strict_types = 1);
 namespace Bug14710;
 
 use function PHPStan\Testing\assertType;

tests/PHPStan/Analyser/nsrt/bug-7259.php

@@ -1,5 +1,5 @@
-<?php declare(strict_types = 1);
-
+<?php // lint >= 8.0
+declare(strict_types = 1);
 namespace Bug7259;
 
 use function PHPStan\Testing\assertType;

tests/PHPStan/Analyser/nsrt/bug-7987.php

@@ -1,5 +1,5 @@
-<?php declare(strict_types=1);
-
+<?php // lint >= 8.0
+declare(strict_types=1);
 namespace Bug7987;
 
 use function PHPStan\Testing\assertType;

tests/PHPStan/Analyser/nsrt/bug-9208.php

@@ -1,4 +1,4 @@
-<?php
+<?php // lint >= 8.0
 
 namespace Bug9208;