[m-rev.] for review: fix bug #257

[Peter Wang]

On Tue, 21 May 2013 10:30:23 +1000, Peter Wang <novalazy at gmail.com> wrote:
>     Warning: variable `Gee' is the subject of a require_complete_switch
>     scope but does not occur in the sub-goal.

Another one:

    Warning: the subject of a require_complete_switch scope `Gee' does
    not occur in its sub-goal.

Peter