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Re: What should 'qr/\p{pkg::L}/ ' do?

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October 9, 2015 12:08
Re: What should 'qr/\p{pkg::L}/ ' do?
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On Fri, Oct 09, 2015 at 07:50:49AM -0400, Ricardo Signes wrote:
> * Karl Williamson <> [2015-10-08T10:58:23]
> > Currently it evaluates to the Unicode property 'Letter'.
> > 
> > But I think that is the wrong thing to do.
> > 
> > The pkg seems to me to want to force this into a user-defined property.
> > Recall that by defining a subroutine, a user can create their own
> > properties.  The catch is that their names have to begin with 'In' or 'Is'.
> > Therefore, I think that this should be a compile- or run-time failure that
> > the property pkg::L is not found.
> I agree, but I wonder whether a "illegal name" wouldn't be better than "Can't
> find."  The fix is for the user to rename their &L (if they made one) rather
> than to figure out why it can't be found.
> At any rate, acting like L is no good.

Is there actually a reason why user-defined properties must start
with 'In' or 'Is'? In 5.12, this requirement wasn't enforced, and
it "just worked". Considering there are predefined classes starting
with "In" and "Is", I can't imagine it's to prevent name clashes.


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