[m-rev.] for review: mercury implementation of string.m

[Michael Day]

> No, it's because with many garbage collectors allowing pointers
> into the middle of objects has a significant performance cost.

Right. How about adding a general string buffer type, containing a string
and an index into that string (is anything else required?) that can be
used by lex and other modules that process strings in this way so that
first_char can be deprecated/removed?

Michael

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