code: public function toPhpCode(string $containerVariable, array $usedVariables = array()): InlineEntryInterface
      {
          $code = sprintf('$this->registry->createService(%s, %s, $this->delegateLookupContainer)', var_export($this->serviceProviderKey, true),
              var_export($this->serviceName, true));
  
          return new InlineEntry($code, null, $usedVariables);
      }
docs: Returns an InlineEntryInterface object representing the PHP code necessary to generate
  the container entry.
  
  @param string $containerVariable The name of the variable that allows access to the container instance. For instance: "$container", or "$this->container"
  @param array  $usedVariables     An array of variables that are already used and that should not be used when generating this code.
  
  @return InlineEntryInterface