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use strict;
use Test::More tests => 12;
BEGIN { $^W = 1; }
my $warnings = '';
local $SIG{__WARN__} = sub { $warnings .= join '', @_ };
is( undef, undef, 'undef is undef');
is( $warnings, '', ' no warnings' );
isnt( undef, 'foo', 'undef isnt foo');
is( $warnings, '', ' no warnings' );
isnt( undef, '', 'undef isnt an empty string' );
isnt( undef, 0, 'undef isnt zero' );
like( undef, '/.*/', 'undef is like anything' );
is( $warnings, '', ' no warnings' );
eq_array( [undef, undef], [undef, 23] );
is( $warnings, '', 'eq_array() no warnings' );
eq_hash ( { foo => undef, bar => undef },
{ foo => undef, bar => 23 } );
is( $warnings, '', 'eq_hash() no warnings' );
eq_set ( [undef, undef, 12], [29, undef, undef] );
is( $warnings, '', 'eq_set() no warnings' );
eq_hash ( { foo => undef, bar => { baz => undef, moo => 23 } },
{ foo => undef, bar => { baz => undef, moo => 23 } } );
is( $warnings, '', 'eq_hash() no warnings' );
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