Test failure with negative substring offsets

[Peter Stephenson <Peter.Stephenson@csr.com>]

This is now failing:

./D04parameter.ztst: starting.
*** /tmp/zsh.ztst.err.18663	Mon May 23 15:58:07 2011
--- /tmp/zsh.ztst.terr.18663	Mon May 23 15:58:07 2011
***************
*** 1 ****
! (eval):2: substring expression: 3 < 5
--- 1 ----
! (eval):2: substring expression: 3 < 0
Test ./D04parameter.ztst failed: error output differs from expected as shown above for:
   foo="123456789"
   print ${foo:5:-6}
Was testing: Regression test for total length < 0 in string
./D04parameter.ztst: test failed.
**************************************
0 successful test scripts, 1 failure, 0 skipped
**************************************
make: *** [check] Error 1

I'll wait for it to stop failing.  I'm guessing this is to do with
29224.

I think possibly the error could be clearer.  It's not really clear what 3
being less than 5 has got to do with the problem, i.e. that counting
6 back from the end puts you before the start offset.

-- 
Peter Stephenson <pws@csr.com>            Software Engineer
Tel: +44 (0)1223 692070                   Cambridge Silicon Radio Limited
Churchill House, Cambridge Business Park, Cowley Road, Cambridge, CB4 0WZ, UK


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