He names the patch files starting with "dor". Would that be a better name than "defined_or"?
I personally prefer "dor" to "defined_or". Actually, I quite like Larry's original "err" -- though the majority of P5P seemed to prefer "dor", based on some long P5P threads. To be "consistent" with Perl 6, you might even consider "orelse".
Note that while the // "defined or" operator was added to Perl 5.10, the low precedence version of this operator was not. AFAICT, this low precedence operator morphed from err to dor to orelse; orelse is in
Perl 6
as a similar, but not identical, low precedence version of //, but it's not in Perl 5 and I'm not aware of any plans to add it. See also this Larry response on perl6-language mailing list.
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Actually, IIRC, for quite a while, 5.9.x *had* err, and it was culled not to long before 5.10 came out due to some backwards compatability issues noone seemed to be able to resolve.
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I'm actually quite happy that the 5.8.x series is out of maint now. Maintaining those patches was quite a lot of work.
Note that those patches still add the err keyword to perl.
The disadvantage of those patches over the proposal of a module/function, is that it is inside the perl binary, and all has to be recompiled from scratch.
Enjoy, Have FUN! H.Merijn
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