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Okay, I have yet another Code Contracts question. I have a contract on an interface method that looks like this (other methods omitted for clarity): [ContractClassFor(typeof(IUnboundTagGroup))] public abstract class ContractForIUnboundTagGroup : IUnboundTagGroup { public IUnboundTagGroup[] GetAllGroups() { Contract.Ensures(Contract.Result<IUnboundTagGroup[]>() != null); Contract.Ensures(Contract.ForAll(Contract.Result<IUnboundTagGroup[]>(), g => g != null)); return null; } } I have code consuming the interface that looks like this: public void AddRequested(IUnboundTagGroup group) { foreach (IUnboundTagGroup subGroup in group.GetAllGroups()) { AddRequested(subGroup); } //Other stuff omitted } AddRequested requires a non-null input parameter (it implements an interface which has a Requires contract) and so I get a 'requires unproven: group != null' error on the subGroup being passed into AddRequested . Am I using the ForAll syntax correctly? If so and the solver simply isn't understanding, is there another way to help the solver recognize the contract or do I simply need to use an Assume whenever GetAllGroups() is called?

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