[m-rev.] diff: implement io__set_environment_variable for .NET

[Ralph Becket]

Fergus Henderson, Saturday,  2 November 2002:
> Index: io.m
> ===================================================================
> RCS file: /home/mercury1/repository/mercury/library/io.m,v
> retrieving revision 1.272
> +
> +
> +io__setenv(Var, Value) :-
> +	string__format("%s=%s", [s(Var), s(Value)], EnvString),
> +	impure io__putenv(EnvString).

Very minor point: I think the following is clearer:

io__setenv(Var, Value) :-
	impure io__putenv(format("%s=%s", [s(Var), s(Value)])).

- Ralph
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