square/dagger — pull request #72 by cgruber (2012-10-23 14:41:14+00:00)
Title: Extension graphs.  (This is a straw man - needs more tests)

Allow a graph to be extended such that extension graph instances will delegate up the chain if they can't satisfy dependencies. This can be used to implement a 'scope' concept by creating a new extension graph with modules for those appropriately scoped objects being created and collected at the start and end of each scope.