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

[Ralph Becket]

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.

-- Ralph
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