support contextual binding on first class callables

Container.php

@@ -11,6 +11,7 @@
 use LogicException;
 use ReflectionClass;
 use ReflectionException;
+use ReflectionFunction;
 use ReflectionParameter;
 use TypeError;
 
@@ -648,8 +649,8 @@ public function call($callback, array $parameters = [], $defaultMethod = null)
     {
         $pushedToBuildStack = false;
 
-        if (is_array($callback) && ! in_array(
-            $className = (is_string($callback[0]) ? $callback[0] : get_class($callback[0])),
+        if (($className = $this->getClassForCallable($callback)) && ! in_array(
+            $className,
             $this->buildStack,
             true
         )) {
@@ -667,6 +668,22 @@ public function call($callback, array $parameters = [], $defaultMethod = null)
         return $result;
     }
 
+    /**
+     * Get the class name for the given callback, if one can be determined.
+     *
+     * @param  callable|string  $callback
+     * @return string|false
+     */
+    protected function getClassForCallable($callback)
+    {
+        if (is_callable($callback) &&
+            ! ($reflector = new ReflectionFunction($callback(...)))->isAnonymous()) {
+            return $reflector->getClosureScopeClass()->name ?? false;
+        }
+
+        return false;
+    }
+
     /**
      * Get a closure to resolve the given type from the container.
      *