In the code below, the sub article_title1 shows the error I made and sub article_title2 shows the hack that fixed it. Given this, I've two questions:

1. Exactly what is going wrong in the first sub?
2. Is there an idiomatic version of the second sub?

It looks as though the internal pointer to the array element is getting trashed by the dual action of for and shift, but I'm not clear on the details.

#!/perl/bin/perl
#
use strict;
use warnings;
use diagnostics;

my @text_master = <DATA>;
chomp @text_master;
my @text = @text_master;
article_title1();
print "\n";
@text = @text_master;
article_title2();

sub article_title1 {
    local $_ = shift(@text); # left in for side effect
    if (@text) {
        for (@text) {
            print "# TEXT-1 = '$_'\n";
            last if (/^$/);
            shift(@text);
        }
    }
    print "# TEXT-2 = '$_'\n" for @text;
}

sub article_title2 {
    local $_ = shift(@text); # left in for side effect
    if (@text) {
        my @text_copy = @text;
        for (@text) {
            print "# TEXT-1 = '$_'\n";
            last if (/^$/);
            shift(@text_copy);
        }
        @text = @text_copy;
    }
    print "# TEXT-2 = '$_'\n" for @text;
}

__DATA__
==Play Chess: 
Click the join icon to play

Matches_Sought.gif Matches Sought Graph

You can also start a game by clicking a dot in the Matches Sought grap
+h.

Rest the mouse pointer over a dot.

Games on ICC are often described by their time limits.
[download]

Which results in:

# TEXT-1 = 'Click the join icon to play'
# TEXT-1 = 'Matches_Sought.gif Matches Sought Graph'
# TEXT-1 = 'You can also start by clicking a dot in the graph.'
# TEXT-1 = 'Rest the mouse pointer over a dot.'
# TEXT-1 = 'Games on ICC are often described by their time limits.'
# TEXT-2 = ''
# TEXT-2 = 'Rest the mouse pointer over a dot.'
# TEXT-2 = ''
# TEXT-2 = 'Games on ICC are often described by their time limits.'

# TEXT-1 = 'Click the join icon to play'
# TEXT-1 = ''
# TEXT-2 = ''
# TEXT-2 = 'Matches_Sought.gif Matches Sought Graph'
# TEXT-2 = ''
# TEXT-2 = 'You can also start by clicking a dot in the graph.'
# TEXT-2 = ''
# TEXT-2 = 'Rest the mouse pointer over a dot.'
# TEXT-2 = ''
# TEXT-2 = 'Games on ICC are often described by their time limits.'

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