test failure for substr

[Ben Abbott]

Rik,

Does this test from changeset 42d5ff896e85 work for you?

        assert (substr ("This is a test string", 1, 0), "");

It fails for me due to a difference in size.

a = substr ("This is a test string", 1, 0);
b = "";
whos a b
Variables in the current scope:

   Attr Name        Size                     Bytes  Class
   ==== ====        ====                     =====  ===== 
        a           1x0                          0  char
        b           0x0                          0  char

Total is 0 elements using 0 bytes

Any objection to changing it to ...

        assert (isempty (substr ("This is a test string", 1, 0));

Ben