fix build on php 7.4

Author: staabm

tests/PHPStan/Analyser/NodeScopeResolverTest.php

@@ -683,8 +683,10 @@ public function dataFileAsserts(): iterable
 			yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-6308.php');
 		}
 
+		if (PHP_VERSION_ID >= 70400) {
+			yield from $this->gatherAssertTypes(__DIR__ . '/../Rules/Comparison/data/bug-6473.php');
+		}
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-6500.php');
-		yield from $this->gatherAssertTypes(__DIR__ . '/../Rules/Comparison/data/bug-6473.php');
 	}
 
 	/**

tests/PHPStan/Rules/Comparison/BooleanNotConstantConditionRuleTest.php

@@ -4,6 +4,7 @@
 
 use PHPStan\Rules\Rule;
 use PHPStan\Testing\RuleTestCase;
+use const PHP_VERSION_ID;
 
 /**
  * @extends RuleTestCase<BooleanNotConstantConditionRule>
@@ -115,6 +116,10 @@ public function testTreatPhpDocTypesAsCertainRegression(bool $treatPhpDocTypesAs
 
 	public function testBug6473(): void
 	{
+		if (PHP_VERSION_ID < 70400) {
+			$this->markTestSkipped('Test requires PHP 7.4.');
+		}
+
 		$this->treatPhpDocTypesAsCertain = true;
 		$this->analyse([__DIR__ . '/data/bug-6473.php'], []);
 	}

tests/PHPStan/Rules/Comparison/data/bug-6473.php

@@ -1,4 +1,4 @@
-<?php
+<?php // lint >= 7.4
 
 namespace Bug6473;