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

##</code><code>##

<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.