[m-rev.] diff: fix mantis bug 216

[Julien Fischer]

On Tue, 6 Sep 2011, Zoltan Somogyi wrote:

> compile/ml_lookup_switch.m:
> 	If a lookup switch has no output variables, then do not generate
> 	a lookup table for it, since it would involve creating a structure
> 	type with no fields, which Visual C cannot handle. This can happen
> 	for semidet switches, in which the work is done by range test or
> 	a bit vector check. An example is char.is_digit.
>
> 	The corresponding module for the LLDS backend, lookup_switch.m,
> 	is already doing this.

Thanks for that -- I've also merged this onto the 11.07 branch.

Julien.
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