Add some failing tests around targeted dependencies

[wagenet]

No description provided.

[rust-highfive]

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[wagenet]

ping @alexcrichton

[alexcrichton]

Thanks for this! We can't merge failing tests, though, so perhaps this can be cc'd on the relevant issues and left as good tests for when they're fixed?

[wagenet]

@alexcrichton I referenced it on #3195. Guess I should have pinged you there.

[dwijnand]

Closing for now..