I am just reading and testing the 5.10 features of perl. Tested "say", "state" but it works only when 'use v5.10' is there in file. Why it is ?

perl version available by default in my machine is

perl -v 
This is perl, v5.10.1 (*) built for i486-linux-gnu-thread-multi

Copyright 1987-2009, Larry Wall

Perl may be copied only under the terms of either the Artistic License
+ or the GNU General Public License, which may be found in the Perl 5 
+source kit.

Complete documentation for Perl, including FAQ lists, should be found 
+on this system using "man perl" or "perldoc perl".  If you have acces
+s to the Internet, point your browser at http://www.perl.org/, the Pe
+rl Home Page.

[download]


without version requirement 
perl -e 'say "test"';

String found where operator expected at -e line 1, near "say "test""
    (Do you need to predeclare say?)
syntax error at -e line 1, near "say "test""
Execution of -e aborted due to compilation errors.

[download]


with version requirement it works fine 
perl -M5.10.1 -e 'say "test"';
test

[download]


Is it my misunderstanding, please explain me. Google search with these words 'say', 'state', are not giving useful results. Thanks for your help.

In reply to wondering why does 5.10 features are not working by Anonymous Monk

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