[m-rev.] for review: make parsing tail recursive

[Zoltan Somogyi]

On 07-May-2008, Paul Bone <pbone at csse.unimelb.edu.au> wrote:
> I thought that before the multi-cons-id switch arms it was still possible 
> to write:
>
> 	(
> 		( Var = fn1
>           	; Var = fn2 ),
> 		goal
> 	;
> 	...
>
> and goal would be duplicated by the complier, but the human didn't need to 
> duplicate goal, and the compiler would correctly understand the determinism 
> of the entire switch.

Yes, there was such a time, but before that, there was a time at which
the compiler would give you a determinism error for code like that.
The parser was written then.

Zoltan.
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