code: protected function getConcreteFromInterface($interface)
      {
          if (!$this->isAbstractExists($interface)) {
              throw Internal\Exception\ReflectionExceptionFactory::runtime(
                  sprintf("%s has no concrete implementation in the class binding stack.", $interface)
              );
          }
  
          try {
              return $this->getResolvedSingleton($interface);
          } catch (\Exception $e) {
          }
  
          $concrete = $this->bindings[$interface]['concrete'];
  
          $object = $concrete instanceof \Closure ? $concrete($this) : $this->build($concrete);
  
          if ($this->isShared($interface)) {
              $this->markAsResolved($interface, $object, 'singleton');
          } else {
              $this->markAsResolved($interface, $object);
          }
  
          return $object;
      }
docs: Get concrete implementation from abstract.
  
  @param string $interface The interface name.
  @return object