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Re: [PATCH] Add open "|-" and open "-|" to perlopentut

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Aristotle Pagaltzis
August 26, 2008 16:02
Re: [PATCH] Add open "|-" and open "-|" to perlopentut
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* Tom Christiansen <> [2008-08-27 00:25]:
> I do hate (ok, enjoy not one blinkin' bit) explaining that
> "\t" and '\t' differ, but that m/\t/ and m'\t' do not, or
> that "\U$a" and '\U$a' differ, but unlike the \t case where
> m// doesn't matter, m/\U$a/ and m'\U$a' indeed differ. I know
> why. You know why. But I get queasy trying to cleanly explain
> it off the cuff. Or cough.

Well, yes. Layered quoting is terribly hard to get right for most
people. (I happen to have some cognitive quirks that largely (but
not entirely) exempt me from this, but I know that my case is
rare indeed.)

This is why Perl 6 is hoisting patterns into a fully first-class
part of the language syntax; whereas in Perl 5, far greater
recognition though they may be granted compared to other
languages, they aren’t quite entirely emancipated. But that is
neither here nor there.

Instead, I have to note that with this observation, we have come
full circle: the very fact that layered quoting is so difficult
to cognitively process would seem to be an argument against
interpolative interfaces.

Aristotle Pagaltzis // <>

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