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use strict;
use warnings;
use Test::More tests => 1;
=pod
This example is take from: http://www.python.org/2.3/mro.html
"Serious order disagreement" # From Guido
class O: pass
class X(O): pass
class Y(O): pass
class A(X,Y): pass
class B(Y,X): pass
try:
class Z(A,B): pass #creates Z(A,B) in Python 2.2
except TypeError:
pass # Z(A,B) cannot be created in Python 2.3
=cut
eval q{
{
package X;
use Class::C3;
package Y;
use Class::C3;
package XY;
use Class::C3;
BEGIN { our @ISA = ('X', 'Y'); }
package YX;
use Class::C3;
BEGIN { our @ISA = ('Y', 'X'); }
package Z;
eval 'use Class::C3' if $Class::C3::C3_IN_CORE;
BEGIN { our @ISA = ('XY', 'YX'); }
}
Class::C3::initialize();
# now try to calculate the MRO
# and watch it explode :)
Class::C3::calculateMRO('Z');
};
#diag $@;
like($@, qr/Inconsistent hierarchy /, '... got the right error with an inconsistent hierarchy');
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