swift

369b2aba - Add a Regression Test For Scenario Improved By Private Dependencies

Add a Regression Test For Scenario Improved By Private Dependencies The basic setup is this - Suppose that three files define four types: // File 1 struct A {} // File 2 struct B { let x: A } struct C { } // File 3 struct D { let x: C } If type 'A' is perturbed, we could expect that File 2 would rebuild because B has a member of type A. What we don't expect is for File 3 to rebuild, but thanks to cascading edges that is precisely that happens! This is because the member x in File 3 creates a cascading edge to File 2, and that edge is traversed while evaluating the cascading edge from File 2 to File 1. With private dependencies, the expected rebuild behavior is restored. Commit a regression test to this effect.