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Re: Re^8: NO PERL 6

by BrowserUk (Pope)
on Dec 10, 2002 at 16:21 UTC ( #218816=note: print w/replies, xml ) Need Help??

in reply to Re^8: NO PERL 6
in thread NO PERL 6

Catenation with a here-doc obviously:^) (since left-shifting a string isn't legal?);

"10" << 10; this is the stuff 10

Would be ambiguous, were it not that then you have a constant in a void context, which is rarely ever useful.

Once you remove the void context as in

my $var = "10" <<10; this is the stuff 10

it would be ambiguous, but I think that being able to use a number as a here-doc delimiter is as bad as the long deprecated (and now illegal) practice of using a space for that purpose. I always assumed (without ever having had cause to actually check until now) that here-doc delimiters followed the same naming rules as labels. I now see that is untrue, but I can't think of a good reason why it shouldn't be made so. That would remove that ambiguity.

At the end of the day, personally, I'll probably be quite happy to accept '_' or '~' (or any other syntax the powers that be decide upon) for catenation, but 'simple' abuttment seems almost logical (to me), and I was exploring the idea to see what effect it might have on the rest of the current perl syntax. I don't yet see anything that would be a problem that I wouldn't be happy to change to accomodate it, but I don't use most of the more esoteric constructs that it might conflict with, and have relatively little history with the language which means that I am open to possible changes that those with ingrained habits would rail against.

I have no expectation that any of my meanderings are going to influence anything one way or the other, but when I see something that raises a queston in my mind that I can't resolve by a little playing around or research, I am of the habit of asking the question of those with better experience than I. That's my prefered way to assimilate new knowledge. It seems a shame that in some quarters at least, this practice is seen as bad. Not you I might add.

Okay you lot, get your wings on the left, halos on the right. It's one size fits all, and "No!", you can't have a different color.
Pick up your cloud down the end and "Yes" if you get allocated a grey one they are a bit damp under foot, but someone has to get them.
Get used to the wings fast cos its an 8 hour day...unless the Govenor calls for a cyclone or hurricane, in which case 16 hour shifts are mandatory.
Just be grateful that you arrived just as the tornado season finished. Them buggers are real work.

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Re^10: NO PERL 6
by Aristotle (Chancellor) on Dec 10, 2002 at 16:57 UTC
    Let's undo a few assumptions.
    sub BITS () { 16 } my $x = 100 <<BITS;
    Ball's in your court again. :-) The obvious problem here is certainly easy to fix by stricter syntax, but in thinking about the fix I've already found a few more ambiguities..

    Makeshifts last the longest.

      Syntax error. Here-docs must now be quoted, << is no-longer left shift, and there is no closing >> to make that a qw[] equivalent :)
        #!/usr/bin/perl print <<X; sorry, nope. they need not be quoted X __END__ sorry, nope. they need not be quoted

        Makeshifts last the longest.

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