Fix Rector autoloading issue

src/Reflection/BetterReflection/BetterReflectionSourceLocatorFactory.php

@@ -18,6 +18,7 @@
 use PHPStan\Reflection\BetterReflection\SourceLocator\OptimizedDirectorySourceLocatorRepository;
 use PHPStan\Reflection\BetterReflection\SourceLocator\OptimizedSingleFileSourceLocatorRepository;
 use PHPStan\Reflection\BetterReflection\SourceLocator\PhpVersionBlacklistSourceLocator;
+use PHPStan\Reflection\BetterReflection\SourceLocator\RectorAutoloadSourceLocator;
 use PHPStan\Reflection\BetterReflection\SourceLocator\SkipClassAliasSourceLocator;
 use function array_merge;
 use function array_unique;
@@ -108,6 +109,7 @@ public function create(): SourceLocator
 		if (!$this->disableRuntimeReflectionProvider) {
 			$locators[] = new ClassWhitelistSourceLocator($this->autoloadSourceLocator, $this->staticReflectionClassNamePatterns);
 		} else {
+			$locators[] = new RectorAutoloadSourceLocator();
 			$locators[] = $this->autoloadSourceLocator;
 		}
 		$locators[] = new PhpVersionBlacklistSourceLocator(new PhpInternalSourceLocator($astLocator, $this->reflectionSourceStubber), $this->phpstormStubsSourceStubber);

src/Reflection/BetterReflection/SourceLocator/RectorAutoloadSourceLocator.php

@@ -0,0 +1,38 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Reflection\BetterReflection\SourceLocator;
+
+use PHPStan\BetterReflection\Identifier\Identifier;
+use PHPStan\BetterReflection\Identifier\IdentifierType;
+use PHPStan\BetterReflection\Reflection\Reflection;
+use PHPStan\BetterReflection\Reflector\Reflector;
+use PHPStan\BetterReflection\SourceLocator\Type\SourceLocator;
+use function class_exists;
+use function interface_exists;
+use function strpos;
+use function strtolower;
+use function trait_exists;
+
+class RectorAutoloadSourceLocator implements SourceLocator
+{
+
+	public function locateIdentifier(Reflector $reflector, Identifier $identifier): ?Reflection
+	{
+		if (!$identifier->isClass()) {
+			return null;
+		}
+
+		$className = strtolower($identifier->getName());
+		if (strpos($className, 'rectorprefix') === 0 || strpos($className, 'rector\\') === 0) {
+			class_exists($identifier->getName()) || interface_exists($identifier->getName()) || trait_exists($identifier->getName());
+		}
+
+		return null;
+	}
+
+	public function locateIdentifiersByType(Reflector $reflector, IdentifierType $identifierType): array
+	{
+		return [];
+	}
+
+}