When I want to inherite some service from added extension (myService < extensionName.service:) I get notice Undefined index: extensionName.service. The notice origin from Compiler.php:172. I was able to figure out that problem is either in Compiler.php:processServices method (wrong parameters passed to parseServices method) or in Compiler.php: parseServices method where services and factories are merged.

I'm using the latest dev of Nette.