The help for say says 

This keyword is available only when the "say" feature is enabled, or w
+hen prefixed with "CORE::"; see feature.
Alternately, include a "use v5.10" or later to the current scope.

[download]

Perl ships with lots of documentation :) try perldoc

In reply to Re: Unquoted string "say" may clash with future reserved word by RichardK
in thread Unquoted string "say" may clash with future reserved word by topbanana

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