[m-rev.] for review: --warn-unused-types

[Zoltan Somogyi]

For review by anyone.

I am particularly seeking feedback on the XXX at the end of the
log file, which I plan to either act on or delete, depending on
your opinions, before commit. To help you decide, you should
see the diffs to the .err_exp files in tests/warnings, and see whether
you think the new warnings there are do more to help or to distract.

Zoltan.
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