[m-rev.] for review: set_ctree234.member

[Julien Fischer]

On Fri, 5 Nov 2010, Peter Wang wrote:

> The argument order one_member(Set, Elem) is more useful for solutions;
> perhaps it is time to add it to other set modules?

I suggest we make an annoucement with 11.01 and then change the other
modules after that.

> Also, is this too much of a feature to go on 10.04?

It can go on if it's absolutely essential.

The diff looks fine.

Julien.
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