Re: Should undefined behavior be encouraged in Emacs?

[Richard Stallman]

    > In simple cases such as (goto-char -5), users tend to see what the
    > behavior is, and are likely to write code that depends on it, even if
    > it isn't documented.  Thus, leaving it undocumented doesn't mean that
    > we can change it and nobody will notice.

    If you make it a hard, inescapable error, that won't happen.

That is true; this would pressure everyone to carefully make sure not
to supply out-of-range arguments.  But is that goal really more
desirable than the convenience of rounding out-of-range arguments?


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Dr Richard Stallman
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