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1
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package Sub::Prepend; |
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2
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6
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6
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27443
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use 5.006001; |
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6
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21
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6
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285
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3
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4
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$VERSION = 0.01; |
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5
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6
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6
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6
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34
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use Exporter; |
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6
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12
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6
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456
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7
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@ISA = Exporter::; |
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8
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@EXPORT_OK = qw/ prepend /; |
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9
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$EXPORT_TAGS{ALL} = \@EXPORT_OK; |
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10
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11
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6
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6
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30
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use strict; |
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6
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21
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6
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185
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12
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6
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6
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31
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use Carp; |
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6
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10
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6
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437
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13
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6
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6
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33
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use Scalar::Util 1.11 'set_prototype'; |
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6
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129
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6
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565
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14
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6
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6
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4958
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use Symbol qw/ qualify_to_ref qualify /; |
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6
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5291
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6
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406
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15
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16
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6
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6
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37
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use vars qw/ $CALLER /; |
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6
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10
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6
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1038
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17
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18
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*CALLER = \1; |
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19
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20
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sub prepend { |
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21
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8
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8
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1
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6476
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my ($name, $code) = @_; |
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22
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23
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8
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39
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my $glob = qualify_to_ref($name => scalar caller); |
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24
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25
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8
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100
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237
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defined &$glob |
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26
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or croak(sprintf __PACKAGE__ . ": Subroutine &%s not defined", qualify($name => scalar caller)); |
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27
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28
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7
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13
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my $orig = \&$glob; |
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29
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30
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my $prepender = set_prototype( |
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31
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sub { |
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32
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7
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7
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2059
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&$code; # Don't use parenthesis! |
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33
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7
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1694
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goto &$orig; |
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34
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}, |
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35
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7
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42
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prototype $orig |
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36
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); |
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37
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38
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{ |
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39
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6
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6
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31
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no warnings 'redefine'; |
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6
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9
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6
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450
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7
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12
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40
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7
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17
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*$glob = $prepender; |
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41
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} |
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42
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43
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7
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21
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return; |
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44
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} |
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45
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46
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1; |
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47
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48
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__END__ |