Add the test case I am using to bring up the new IUO implementation.
Add the test case I am using to bring up the new IUO implementation.

This is a nice contained test case that has the goal of testing all
the new functionality. Having this committed before the code changes
will make it clear whether any behavior changes between the old and
new implementation (I expect some small diagnostic changes like
uttering T? instead of T! for some types).

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