Use B::Deparse (Tip #6 from the Basic debugging checklist) to see how perl treats your code: 

use warnings;
use strict 'refs';
my(@A) = ('a', 'b', 'c');
use File::Glob ();
while (defined(my $x = glob(join($", @A)))) {
    do {
        print "$x\n"
    };
}
print "@A\n";

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In reply to Re: Reading from an array using angle brackets by toolic
in thread Reading from an array using angle brackets by bounsy

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