Just to narrow the problem down a little, perl 5.10.1 also SEGVs, but 5.12.3 does not.
The code runs fine on Ubuntu & perl 5.10.1 if you remove the pre-declared prototype (sub foo();). You don't need prototypes. They very probably don't do whatever it is you think they do.
Update: This works for me on 5.10.1. Try it on your 5.10.0:
#!perl510 -w
use strict;
#sub foo();
foo();
sub foo() { # shouldn't use () but does no harm here
my $foo;
format STDOUT =
^
$foo;
.
$foo="X";
write;
}
I've been doing a lot of Python recently. Semi-colons sure do look weird now :)
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