Use non-emulative Lexer if the desired PHP version matches the runtim…

…e one

conf/config.neon

@@ -264,7 +264,11 @@ services:
 		class: PhpParser\BuilderFactory
 
 	-
-		class: PhpParser\Lexer\Emulative
+		class: PhpParser\Lexer
+		factory: @PHPStan\Parser\LexerFactory::create()
+
+	-
+		class: PHPStan\Parser\LexerFactory
 
 	-
 		class: PhpParser\NodeTraverser

src/Parser/LexerFactory.php

@@ -0,0 +1,27 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Parser;
+
+use PhpParser\Lexer;
+use PHPStan\Php\PhpVersion;
+
+class LexerFactory
+{
+
+	private PhpVersion $phpVersion;
+
+	public function __construct(PhpVersion $phpVersion)
+	{
+		$this->phpVersion = $phpVersion;
+	}
+
+	public function create(): Lexer
+	{
+		if ($this->phpVersion->getVersionId() === PHP_VERSION_ID) {
+			return new Lexer();
+		}
+
+		return new Lexer\Emulative();
+	}
+
+}

src/Testing/TestCase-staticReflection.neon

@@ -1,3 +1,6 @@
+parameters:
+	phpVersion: 80000 # force Emulative lexer
+
 services:
 	-
 		class: PHPStan\Testing\TestCaseSourceLocatorFactory