[m-dev.] tightening up require_complete_switch

[Zoltan Somogyi]

On Tue, 19 Apr 2016 12:07:06 +1000 (AEST), "Zoltan Somogyi" <zoltan.somogyi at runbox.com> wrote:
> We could in future even use the
> variable name in the scope to control switch detection, by checking
> whether the disjunction it is given is a switch on the named variable
> *before* checking to see if it is a switch on any other variables.
> (In fact, I think this should be easy to implement.)

And I have now implemented and committed it. Without this change,
the new test case in the attached diff wouldn't pass.

Zoltan.

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