Reopening file by scalar handler has been broken in perl 5.16.0:
open FILE, '>', \my $content or die "Couldn't open scalar filehandle";
open my $fh, ">&=FILE" or die "Couldn't open: $!";
print $fh "Foo-Bar\n";
close $fh;
close FILE;
print $content;
This has been fixed by upstream commit:
commit 7b3cf1c058e25efdde99ad84398db2e7bc9892b4
Author: Father Chrysostomos <sprout>
Date: Wed Jun 20 23:33:28 2012 -0700
[perl #113764] Make &= duping work with PerlIO::scalar