Because it's intended to be "forward compatible", i.e. you should use the latest version of Syntax::Construct from CPAN as it knows about the versions of Perl that are newer than your current Perl version. (It's still possible to update core modules from CPAN, but I fear it's not that common).

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In reply to Re^3: how check the first release of a new operand? by choroba
in thread how check the first release of a new operand? by xiaoyafeng

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