Re: Change in FIGNORE behavior

[Peter Stephenson <pws@xxxxxxx>]

Bart Schaefer wrote:
> var[(R)pattern] is an assignable construct.  Previously
> 
> var[(R)missing]=something
> 
> would replace the first element.  Now it appends an element to the end.

Hmmm... (R) was documented to refer to the last match found, so anyone
relying on it replacing something at the beginning (or, indeed, doing
anything well-defined at all) on a failure is making unwarranted
assumptions.  Still, if this is going to cause multiple hard to find
problems it's going to be a continuing nuisance.

It would be nice to be able to detect if the index is going to be used
for something other than extracting a single element and use the first
index if so, but the current interface doesn't make that easy.

-- 
Peter Stephenson <pws@xxxxxxx>                  Software Engineer
CSR PLC, Churchill House, Cambridge Business Park, Cowley Road
Cambridge, CB4 0WZ, UK                          Tel: +44 (0)1223 692070


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