[m-rev.] Add `:- mutable' declaration to the language.

[Julien Fischer]

On Thu, 1 Sep 2005, Ralph Becket wrote:

> Julien Fischer, Thursday,  1 September 2005:
> > On Thu, 1 Sep 2005, Ian MacLarty wrote:
> > > Can we have pure versions of get_x and set_x which take the I/O state?
> > >
> > It would mean that the module would have to import the io module.  You
> > may not want to do that.
>
> Er, since they implicitly use `:- initialise', such modules do
> implicitly import the io module.
>
Couldn't we relax the rules for initialise delcarations in this case?

Julien.
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