Created attachment 2870 [details]
A sample code that reproduce the bug
In the attached sample the compiler produce an error like this:
Test.cs(27,27): Error CS0314: The type `MoreSpecialized' cannot be used as type parameter `Specialization' in the generic type or method `Test.A<Abstraction>.For<Specialization>()'. There is no boxing or type parameter conversion from `MoreSpecialized' to `Abstraction' (CS0314)
This is wrong becouse of the constraints in A.For and in B declaration.
I'm running the master branch from github.
Fixed in master
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