[m-rev.] for review: --warn-can-fail-functions

[Zoltan Somogyi]

For review by anyone. I am seeking feedback mainly about
the name and documentation of the new option.

The third attached file lists all the can-fail functions in the standard library.
It would be nice to replace these, probably with predicate versions
(which some of them probably already have), though they would need
a longer process: (a) deprecate by marking as obsolete, (b) wait for a release,
and then (c) delete.

Zoltan.
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