[m-rev.] for review: add string builder stream to extras

[Ian MacLarty]

On Mon, Nov 27, 2006 at 04:17:24PM +1100, Julien Fischer wrote:
> >Index: stream/stream_util.string_builder.m
> >===================================================================
> >+
> >+:- instance stream.writer(string_builder_stream, string, 
> >string_builder_state)
> >+        where [
> >+    ( put(_, String, !State) :-
> >+        !.State = string_builder_state(StringList0),
> >+        %
> >+        % The string builder will never clobber the string.  Also we
> >+        % know that nothing else can clobber the string since it isn't 
> >unique.
> 
> s/since/although/?
> 

No, since.  I'm trying to argue that it's okay to lie to the compiler
here.  Does my argument make sense?

> >+        % Therefore the inst cast below is okay, even though it is a lie.
> >+        %
> >+        StringList = [unsafe_promise_unique(String) | StringList0],
> >+        !:State = string_builder_state(StringList)
> >+    )
> >+].

I've followed all your other suggestions.

Ian.
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