I can repeat your issue with my Linux box (and get good behavior w/ AS 5.8.8 under Windows). Based upon what I see in my debugger, you are having a scoping issue. Essentially, every iteration of your while loop reinitializes $line as per your my statement. My guess is they modified the scoping behavior in 5.10.0, which fixes this particular issue. You can avoid the problem with:
while (defined($line = <DATA>) )
chomp $line; # line 7
if ($line =~ s/\\$//) # line 8
$line .= <DATA>;
redo unless eof(DATA);
print "LINE: '$line'\n";
4 4 \
4 4 \
Update:Regarding your comment
I would expect that the while loop wouldn't run if there was an undefined line - so I'm unclear on why the chomp is giving the uninitialized variable warning.
you should check out the documentation to see why the original developer used a redo
in place of a next
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