Re: I should've known better!

[TimToady]

Yes, well, I should have known better too. :-)

In fact, in Perl 6, the equivalent loop:

for @text -> $line {
    ...
}

makes $line a read-only alias to catch just this sort of mixup. You'd write:

for @text <-> $line {
    ...
}

(note the double-ended arrow) to get the read-write semantics. But it's not the default. Perl 6 is all about picking sane defaults while not preventing you from doing the sorts of powerful things you can do in Perl 5.

[GrandFather]

In Perl 5 my $var; ... for $var (...) {...} doesn't alter the contents of the $var global to the for loop. Is that true for both the -> and <-> variants of the Perl 6 for loop illustrated above?

I presume you can for @array <-> my $var {...} in Perl 6 to make the scope of $var obvious.

[moritz]

In Perl 5 my $var; ... for $var (...) {...} doesn't alter the contents of the $var global to the for loop. Is that true for both the -> and <-> variants of the Perl 6 for loop illustrated above?

Yes.

presume you can for @array <-> my $var {...}, in Perl 6 to make the scope of $var obvious.

No, you can't. Both arrows actually introduce a signature, and my in a signature doesn't make sense.

I used to write -> my $x too, but got used to omitting the my rather quickly :-).