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Re: Perl6: What is "idfirst letter"?

by moritz (Cardinal)
on Sep 07, 2011 at 21:08 UTC ( #924680=note: print w/replies, xml ) Need Help??

in reply to Perl6: What is "idfirst letter"?

Thanks for the question, I've tried to clarify it.

I think "idfirst" meant "a character that is allowed as the first character of an identifier", and the authoritative source in all parsing questions says that's <.alpha> (Unicode category "Letter", or the underscore).

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Re^2: Perl6: What is "idfirst letter"?
by ikegami (Pope) on Sep 07, 2011 at 21:12 UTC
    Well, in Perl5, "[" and U+0001 are allowed as the first (and only) character of an identifier, but I don't think anyone would consider them idfirst. I don't know if Perl6 has such exceptions.
      No. There are special variables with "weird" names ($/, $!, $) but they aren't identifiers.

      I also don't think that [ counts as an identifier character in Perl 5, because you can't write sub [ { }

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