Re: Why (substring "abc" 0 4) does not return "abc" instead of an error?

[Andreas Schwab]

Juanma Barranquero <address@hidden> writes:

> BTW, for unexpected behavior wrt strings, my favourite is this one
> (it's not a bug);
>
> (let ((s "ab") (m 2)) (eq (substring s 0 m) (substring s 0 m))) => nil
> (let ((s "ab") (m 1)) (eq (substring s 0 m) (substring s 0 m))) => nil
> (let ((s "ab") (m 0)) (eq (substring s 0 m) (substring s 0 m))) => t

That's not much different from ("foo" == "foo") in C.  Using eq for
comparing non-atoms is seldom useful.

Andreas.

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Andreas Schwab, address@hidden
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