in reply to Here there be cammels!

I have tried setting $.

Interestingly:

while (<DATA>) { chomp; warn "<$_>"; }
warn "One";
$. = 123;
warn "Two";
close DATA;
warn "Three";
$. = 456;
warn "Four";
__DATA__
Zero

[download]

Gives:

<Zero> at - line 1, <DATA> line 1.
One at - line 2, <DATA> line 1.
Two at - line 4, <DATA> line 123.
Three at - line 6.
Four at - line 8, <DATA> line 456.

[download]

And yet, it's a hack. Better to implement the message yourself.

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Re^2: Here there be camels!
by LanX (Saint) on Mar 01, 2015 at 00:04 UTC
    > And yet, it's a hack.

    Looks like a bug for me, though DATA is closed it's reported at FOUR.

    Only b/c a line-number is set.

    > Better to implement the message yourself.

    Well, yeah, undocumented behavior. :)

    Cheers Rolf
    (addicted to the Perl Programming Language and ☆☆☆☆ :)

    PS: Je suis Charlie!

[reply]
      I do not think is a bug: is a edge case of use of very particular features...
      diamond <> never close the handle and __DATA__ is very near to be $0 in this case (if i remember you can seek it and print the main program too). Because you can adjust $. and you had not closed DATA handle you end with the beahviour observed.
      from perldata 
      Text after __DATA__ may be read via the filehandle PACKNAME::DATA , where PACKNAME is the package that was current when the __DATA__ token was encountered. The filehandle is left open pointing to the line after __DATA__. The program should close DATA when it is done reading from it.
      PS. thanks for the line directive hint: never eard about..
      L*

      There are no rules, there are no thumbs..
      Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.
[reply]
[d/l]

        Using DATA was just an example, the same thing happens on a normal filehandle too.

        system 'echo "foo" >/tmp/blah';   
open my $fh, '<', '/tmp/blah' or die $!;
while (<$fh>) { chomp; warn "<$_>"; }
warn "One";
$. = 123;
warn "Two";
close $fh;
warn "Three";
$. = 456;
warn "Four";
__END__
<foo> at - line 3, <$fh> line 1.
One at - line 4, <$fh> line 1.
Two at - line 6, <$fh> line 123.
Three at - line 8.
Four at - line 10, <$fh> line 456.

        [download]

        So LanX is probably right about it being more of a bug than an obscure feature :-)

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