fix thrown Error from yieldAttributes, e.g. when a class extends a no…

…nexistent other class

src/ClassScanner/ComposerMapGenerator.php

@@ -50,13 +50,13 @@ private function convertToClassMap(ClassMap $classMap, array $composerMap): Clas
                 $path = \substr($path, \strlen($this->basePath));
             }
 
-            $classMap->addClass(
-                new ClassSpecification(
-                    $class,
-                    $path,
-                    [...$this->reflector->yieldAttributes($class)]
-                )
-            );
+            try {
+                $attributes = [...$this->reflector->yieldAttributes($class)];
+            } catch (\Error) {
+                $attributes = [];
+            }
+
+            $classMap->addClass(new ClassSpecification($class, $path, $attributes));
         }
 
         return $classMap;

src/Resolver/Reflector.php

@@ -10,6 +10,8 @@
 namespace Aura\Di\Resolver;
 
 use Aura\Di\ClassScanner\AttributeSpecification;
+use Error;
+use Generator;
 use ReflectionClass;
 use ReflectionException;
 
@@ -149,10 +151,15 @@ public function getTraits($class): array
 
     /**
      * @param string $className
-     * @return \Generator<int, AttributeSpecification>
+     *
+     * @return Generator<int, AttributeSpecification>
+     *
      * @throws ReflectionException
+     *
+     * @throws Error An error is thrown when a class contains references to nonexistent other class, e.g. extending
+     * a class from a package that is not available.
      */
-    public function yieldAttributes(string $className): \Generator
+    public function yieldAttributes(string $className): Generator
     {
         $reflectionClass = $this->getClass($className);
         foreach ($reflectionClass->getAttributes() as $attribute) {
@@ -223,7 +230,7 @@ public function configureAttribute(
         string $className,
         int $targetMethod,
         array $targetConfig = []
-    ): \Generator
+    ): Generator
     {
         $instance = $attribute->newInstance();
         yield new AttributeSpecification(