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  1. or download this
    use strict;

...
        print "in show_refs, ref = $ref\n";
    }
}
  2. or download this
    reference to a = SCALAR(0x102d4c)
reference to h->{FOO} = SCALAR(0x13bdb8)
...
reverse order ...
in show_refs, ref = SCALAR(0x13bdb8)
in show_refs, ref = SCALAR(0x102d4c)