Re: 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 (Patriarch) 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.	[reply] [d/l]
Re^3: Perl6: What is "idfirst letter"? by moritz (Cardinal) on Sep 08, 2011 at 05:58 UTC
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 [ { }` Perl 6 - second systems done right	[reply] [d/l] [select]