[m-rev.] for review: pragma reserve_tag

[Ralph Becket]

Fergus Henderson, Saturday, 11 January 2003:
> Estimated hours taken: 6
> Branches: main
> 
> Implement `:- pragma reserve_tag(<TypeName>/<Arity>).'.
> This has the same effect as the `--reserve-tag' option,
> except that it only applies to specified type, rather than
> to all types.
>
> [...]
> 
> --- doc/reference_manual.texi	23 Dec 2002 12:32:58 -0000	1.264
> +++ doc/reference_manual.texi	10 Jan 2003 16:00:12 -0000
> @@ -8845,6 +8850,50 @@
>  
>  @end ifset
>  @c aditi
> +
> + at c XXX The `reserved tag' pragma is not documented because it is intended to
> + at c     be used with `any' insts, which are themselves not yet documented.
> + at c     Also, it is a quite low-level facility, and very
> + at c     implementation-specific...
> + at c
> + at c @node Reserved tag
> + at c @section Reserved tag
> + at c 
> + at c The University of Melbourne Mercury implementation includes some fairly
> + at c low-level support for implementing Herbrand constraint solvers
> + at c (i.e. Prolog-style logic variables).
> + at c 
> + at c In particular, you can use the @samp{reserve_tag} pragma
> + at c to tell the compiler to reserve a tag in the data representation
> + at c for a type.  The intent is for this tag to be used to represent
> + at c unbound variables with inst @samp{any}.
> + at c
> + at c The @samp{reserve_tag} pragma declaration has the following form:
> + at c @example
> + at c :- pragma reserve_tag(@var{type-name}, @var{type-arity}).
> + at c @end example

I think you mean

@c :- pragma reserve_tag(@var{type-name}/@var{type-arity}).

Ralph
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