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  1. or download this
    my $globref = \*GLOB;
*$globref = sub { print "Glob\n" };
GLOB();
  2. or download this
    my $globref = \do { local *GLOB };
print $globref, "\n"; # prints GLOB(0x.......)
*$globref = 1;
print $globref, "\n"; # prints SCALAR(0x.......)