On Thu, Jul 12, 2018 at 6:10 PM, John Cowan <[email protected]> wrote:
> You can't fill a literal string; you have to treat it as immutable.
>
Actually it's not about mutability. There is a documented restriction
("Attempting to mutate literal strings will result in an error if the
mutated size does not occupy the same number of bytes as the original. This
is standards compliant, since the programmer is not supposed to attempt to
mutate literal values, but it may be a little confusing since the error is
inconsistent."). But that is not the issue here, since both #\j and
#\Space are single-byte characters, and in fact (string-fill! (string #\j
#\j) #\space) fails in the same way with the utf8 egg but works without the
egg. So it's a bug, but I would recommend that you avoid mutating strings
altogether.
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