ÿØÿà JFIF    ÿÛ „  ( %"1!%)+...383,7(-.+  -+++--++++---+-+-----+---------------+---+-++7-----ÿÀ  ß â" ÿÄ     ÿÄ H    !1AQaq"‘¡2B±ÁÑð#R“Ò Tbr‚²á3csƒ’ÂñDS¢³$CÿÄ   ÿÄ %  !1AQa"23‘ÿÚ   ? ôÿ ¨pŸªáÿ —åYõõ\?àÒü©ŠÄï¨pŸªáÿ —åYõõ\?àÓü©ŠÄá 0Ÿªáÿ Ÿå[úƒ ú®ði~TÁbqÐ8OÕpÿ ƒOò¤Oè`–RÂáœá™êi€ßÉ< FtŸI“öÌ8úDf´°å}“¾œ6  öFá°y¥jñÇh†ˆ¢ã/ÃÐ:ªcÈ "Y¡ðÑl>ÿ ”ÏËte:qž\oäŠe÷󲍷˜HT4&ÿ ÓÐü6ö®¿øþßèô Ÿ•7Ñi’•j|“ñì>b…þS?*Óôÿ ÓÐü*h¥£ír¶ü UãSç‚Ÿ[AÐaè[ûª•õ&õj?†Éö+EzP—WeÒírJFt ‘BŒ†Ï‡%#tE Øz ¥OÛ«!1›üä±Í™%ºÍãö]°î(–:@<‹ŒÊö×òÆt¦ãº+‡¦%ÌÁ²h´OƒJŒtMÜ>ÀÜÊw3Y´•牋4ǍýʏTì>œú=Íwhyë,¾Ôò×õ¿ßÊa»«þˆѪQ|%6ž™A õ%:øj<>É—ÿ Å_ˆCbõ¥š±ý¯Ýƒï…¶|RëócÍf溪“t.СøTÿ *Ä¿-{†çàczůŽ_–^XþŒ±miB[X±d 1,é”zEù»& î9gœf™9Ð'.;—™i}!ôšåîqêÛ٤ёý£½ÆA–àôe"A$˝Úsäÿ ÷Û #°xŸëí(l »ý3—¥5m! rt`†0~'j2(]S¦¦kv,ÚÇ l¦øJA£Šƒ J3E8ÙiŽ:cÉžúeZ°€¯\®kÖ(79«Ž:¯X”¾³Š&¡* ….‰Ž(ÜíŸ2¥ª‡×Hi²TF¤ò[¨íÈRëÉ䢍mgÑ.Ÿ<öäS0í„ǹÁU´f#Vß;Õ–…P@3ío<ä-±»Ž.L|kªÀê›fÂ6@»eu‚|ÓaÞÆŸ…¨ááå>åŠ?cKü6ùTÍÆ”†sĤÚ;H2RÚ†õ\Ö·Ÿn'¾ ñ#ºI¤Å´%çÁ­‚â7›‹qT3Iï¨ÖÚ5I7Ë!ÅOóŸ¶øÝñØôת¦$Tcö‘[«Ö³šÒ';Aþ ¸èíg A2Z"i¸vdÄ÷.iõ®§)¿]¤À†–‡É&ä{V¶iŽ”.Ó×Õÿ û?h¬Mt–íª[ÿ Ñÿ ÌV(í}=ibÔ¡›¥¢±b Lô¥‡piη_Z<‡z§èŒ)iÖwiÇ 2hÙ3·=’d÷8éŽ1¦¸c¤µ€7›7Ø ð\á)} ¹fËí›pAÃL%âc2 í§æQz¿;T8sæ°qø)QFMð‰XŒÂ±N¢aF¨…8¯!U  Z©RÊ ÖPVÄÀÍin™Ì-GˆªÅËŠ›•zË}º±ŽÍFò¹}Uw×#ä5B¤{î}Ð<ÙD é©¤&‡ïDbàÁôMÁ." ¤‡ú*õ'VŽ|¼´Úgllº¼klz[Æüï÷Aób‡Eÿ dÑ»Xx9ÃÜ£ÁT/`¼¸vI±Ýµ·Ë‚“G³þ*Ÿû´r|*}<¨îºœ @¦mÄ’M¹”.œ«Y–|6ÏU¤jç¥ÕÞqO ˜kDÆÁ¨5ÿ š;Њ¦¦€GÙk \ –Þ=â¼=SͧµªS°ÚÍpÜãQűÀõ¬?ÃÁ1Ñ•õZà?hóœ€ L¦l{Y*K˜Ù›zc˜–ˆâ ø+¾ ­-Ök¥%ùEÜA'}ˆ><ÊIè“bpÍ/qÞâvoX€w,\úªò6Z[XdÒæ­@Ö—€$òJí#é>'°Ú ôª˜<)4ryÙ£|óAÅn5žêŸyÒäMÝ2{"}‰–¤l÷ûWX\l¾Á¸góÉOÔ /óñB¤f¸çñ[.P˜ZsÊË*ßT܈§QN¢’¡¨§V¼(Üù*eÕ“”5T¨‹Âê¥FŒã½Dü[8'Ò¥a…Ú¶k7a *•›¼'Ò·\8¨ª\@\õ¢¦íq+DÙrmÎ…_ªæ»ŠÓœ¡¯’Ré9MÅ×D™lælffc+ŒÑ,ý™ÿ ¯þǤ=Å’Á7µ÷ÚÛ/“Ü€ñýã¼àí¾ÕÑ+ƒ,uµMâÀÄbm:ÒÎPæ{˜Gz[ƒ¯«® KHà`ßØŠéí¯P8Aq.C‰ à€kòpj´kN¶qô€…Õ,ÜNŠª-­{Zö’æû44‰sŽè‰îVíRœÕm" 6?³D9¡ÇTíÅꋇ`4«¸ÝÁô ï’ýorqКÇZ«x4Žâéþuïf¹µö[P ,Q£éaX±`PÉÍZ ¸äYúg üAx ’6Lê‚xÝÓ*äQ  Ï’¨hÍ =²,6ï#rÃ<¯–£»ƒ‹,–ê•€ aÛsñ'%Æ"®ÛüìBᝠHÚ3ß°©$“XnœÖ’î2ËTeûìxîß ¦å¿çÉ ðK§þ{‘t‚Ϋ¬jéîZ[ ”š7L¥4VÚCE×]m¤Øy”ä4-dz£œ§¸x.*ãÊÊ b÷•h:©‡¦s`BTÁRû¾g⻩‹jø sF¢àJøFl‘È•Xᓁà~*j¯ +(ÚÕ6-£¯÷GŠØy‚<Ç’.F‹Hœw(+)ÜÜâÈzÄäT§FߘãÏ;DmVœ3Àu@mÚüXÝü•3B¨òÌÁÛ<·ÃÜ z,Ì@õÅ·d2]ü8s÷IôÞ¯^Ç9¢u„~ëAŸï4«M? 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keys %feature::feature : do { my @features; if ($] >= 5.010) { push @features, qw/switch say state/; push @features, 'unicode_strings' if $] > 5.011002; } @features; }; my %min_version = ( array_base => '5', autoderef => '5.14.0', bitwise => '5.22.0', current_sub => '5.16.0', evalbytes => '5.16.0', fc => '5.16.0', lexical_topic => '5.10.0', lexical_subs => '5.18.0', postderef => '5.20.0', postderef_qq => '5.20.0', refaliasing => '5.22.0', regex_sets => '5.18.0', say => '5.10.0', smartmatch => '5.10.0', signatures => '5.20.0', state => '5.10.0', switch => '5.10.0', unicode_eval => '5.16.0', unicode_strings => '5.12.0', ); my %max_version = ( lexical_topic => '5.23.4', ); $_ = version->new($_) for values %min_version; $_ = version->new($_) for values %max_version; my %additional = ( postderef => ['postderef_qq'], switch => ['smartmatch'], ); sub _enable { my $pragma = shift; if ($warnings{"experimental::$pragma"}) { warnings->unimport("experimental::$pragma"); feature->import($pragma) if exists $features{$pragma}; _enable(@{ $additional{$pragma} }) if $additional{$pragma}; } elsif ($features{$pragma}) { feature->import($pragma); _enable(@{ $additional{$pragma} }) if $additional{$pragma}; } elsif (not exists $min_version{$pragma}) { croak "Can't enable unknown feature $pragma"; } elsif ($] < $min_version{$pragma}) { my $stable = $min_version{$pragma}; if ($stable->{version}[1] % 2) { $stable = version->new( "5.".($stable->{version}[1]+1).'.0' ); } croak "Need perl $stable or later for feature $pragma"; } elsif ($] >= ($max_version{$pragma} || 7)) { croak "Experimental feature $pragma has been removed from perl in version $max_version{$pragma}"; } } sub import { my ($self, @pragmas) = @_; for my $pragma (@pragmas) { _enable($pragma); } return; } sub _disable { my $pragma = shift; if ($warnings{"experimental::$pragma"}) { warnings->import("experimental::$pragma"); feature->unimport($pragma) if exists $features{$pragma}; _disable(@{ $additional{$pragma} }) if $additional{$pragma}; } elsif ($features{$pragma}) { feature->unimport($pragma); _disable(@{ $additional{$pragma} }) if $additional{$pragma}; } elsif (not exists $min_version{$pragma}) { carp "Can't disable unknown feature $pragma, ignoring"; } } sub unimport { my ($self, @pragmas) = @_; for my $pragma (@pragmas) { _disable($pragma); } return; } 1; #ABSTRACT: Experimental features made easy __END__ =pod =encoding UTF-8 =head1 NAME experimental - Experimental features made easy =head1 VERSION version 0.016 =head1 SYNOPSIS use experimental 'lexical_subs', 'smartmatch'; my sub foo { $_[0] ~~ 1 } =head1 DESCRIPTION This pragma provides an easy and convenient way to enable or disable experimental features. Every version of perl has some number of features present but considered "experimental." For much of the life of Perl 5, this was only a designation found in the documentation. Starting in Perl v5.10.0, and more aggressively in v5.18.0, experimental features were placed behind pragmata used to enable the feature and disable associated warnings. The C pragma exists to combine the required incantations into a single interface stable across releases of perl. For every experimental feature, this should enable the feature and silence warnings for the enclosing lexical scope: use experimental 'feature-name'; To disable the feature and, if applicable, re-enable any warnings, use: no experimental 'feature-name'; The supported features, documented further below, are: array_base - allow the use of $[ to change the starting index of @array autoderef - allow push, each, keys, and other built-ins on references lexical_topic - allow the use of lexical $_ via "my $_" postderef - allow the use of postfix dereferencing expressions, including in interpolating strings refaliasing - allow aliasing via \$x = \$y regex_sets - allow extended bracketed character classes in regexps signatures - allow subroutine signatures (for named arguments) smartmatch - allow the use of ~~ switch - allow the use of ~~, given, and when =head2 Ordering matters Using this pragma to 'enable an experimental feature' is another way of saying that this pragma will disable the warnings which would result from using that feature. Therefore, the order in which pragmas are applied is important. In particular, you probably want to enable experimental features I you enable warnings: use warnings; use experimental 'smartmatch'; You also need to take care with modules that enable warnings for you. A common example being Moose. In this example, warnings for the 'smartmatch' feature are first turned on by the warnings pragma, off by the experimental pragma and back on again by the Moose module (fix is to switch the last two lines): use warnings; use experimental 'smartmatch'; use Moose; =head2 Disclaimer Because of the nature of the features it enables, forward compatibility can not be guaranteed in any way. =head1 AUTHOR Leon Timmermans =head1 COPYRIGHT AND LICENSE This software is copyright (c) 2013 by Leon Timmermans. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself. =cut