McDarren reported a segfault in 5.8.4. It's something strange. This segfaults:
use warnings; use strict;
our $I = "f";
$I = undef;
open $I, '<', \3 or die "open in mem: $!";
bless \$a, 0;
$I = ref \$a;
But this doesn't:
use warnings; use strict;
our $I = "f";
undef $I; ## <---
open $I, '<', \3 or die "open in mem: $!";
bless \$a, 0;
$I = ref \$a;
Fixed version follows: I've updated the OP.
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