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# -*- mode: perl; -*-
use strict;
use warnings;
# Test 2 levels of upgrade classes. This used to cause a segv.
use Test::More tests => 1;
use Math::BigInt upgrade => 'Math::BigFloat';
use Math::BigFloat upgrade => 'Math::BigMouse';
no warnings 'once';
@Math::BigMouse::ISA = 'Math::BigFloat';
sub Math::BigMouse::bsqrt {};
() = sqrt Math::BigInt->new(2);
pass('sqrt on a big int does not segv if there are 2 upgrade levels');
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