#2309: containers: specialize functions that fail in a Monad to Maybe

[ross at soi.city.ac.uk]

Quoting Isaac Dupree <isaacdupree at charter.net>:
> Ross Paterson wrote:
> > That's not consensus, but it is a substantial majority, and I think
> > we've explored all the issues.  So I propose to make the change.
>
> Well, what are the guidelines in this case?  Proposer's discretion?  If
> a week has gone by and no one has commented further, I guess you should
> commit the change (or ask someone who can, to do so).  At least, the
> ticket shouldn't be closed until either (1) the patches have been
> applied (and this stated), or (2) until it's explicitly (or clearly)
> been dropped with no change made.  If the patches are different from
> what you actually posted before, you might want to first post the actual
> patches you're planning to apply.

I applied the patch, with only a minor change in a doc comment.

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