As remiah and Anonymous Monk have stated, I expected while and for to behave the same way, and they do for me, on Strawberry Perl v5.16.1: 
#!/usr/env/perl

use strict;
use warnings;

my $q = (shift or 129); # 128 is the largest working value
my @x = ( 'A' x $q, 'B' x $q );

my $glob = '{' . join(',', @x) . '}';

while (my $g = glob($glob)) {
    print "while: $g\n"; 
}

for my $g ( glob( $glob ) ) {
    print "for: $g\n"; 
}

__EOF__
#################
# result:
#
while:
for:

[download]

Running this with a command line argument of 128 gives the expected output of 2 very long strings for while and 2 for for.

-QM
--
Quantum Mechanics: The dreams stuff is made of

In reply to Re^2: glob quietly fails by QM
in thread glob quietly fails by QM

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