[m-dev.] for review: teeny changes to string.m

[Michael Day]

Oh, another thing I noticed in string.m is that there is no method to
update the value of a particular character in a string:

:- pred set(char, int, string, string).
:- mode set(in, in, in, out) is semidet.

or some such predicate and a corresponding unsafe variant. Is this an
intentional lack or is it just that no one has needed it?

Michael



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