$line .= $fh_iterator while $line =~ m{\\$};
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To:

$line .= $fh->getline while $line =~ m{\\$};
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However, the code does return the error below on the last line of my test file...

Use of uninitialized value $line in pattern match (m//) at parser3.pl 
+line 17, <GEN0> line 5.
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Begin Original Post

Hmm... well, I get a new error at least:/p>

Use of uninitialized value $line in pattern match (m//) at parser3.pl 
+line 17, <GEN0> line 5.
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Here's the accompanying code and test file:

#/usr/bin/perl
use strict;
use warnings;

use IO::File;

use 5.010;

my $filename = shift @ARGV;

my $fh = IO::File->new($filename, 'r');

sub fh_iterator {
    my $fh = shift;

    my $line = $fh->getline;
       $line .= fh_iterator($fh) while $line =~ m{\\$};
}

while (my $line = fh_iterator $fh ) {
    print $line;
}
__END___
test.file
foo \
bar \
baz
single line
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