Why doesn't the state function work in Perl without a version?

Question

Perl

As stated in the documentation, the state function appeared in version 5.10 and it is necessary to add a directive or higher to the code. At the moment, version 5.24.0 is on the device, without specifying this directive, the interpreter swears. I can write and then the code will work. Why can't I use state without specifying a version? use v5.10;
use v5.24.0;

Answer 1

This is for backward compatibility with older versions.
Instead of specifying a version, you can use the feature pragma:use feature qw{ state };

Answer 2

RTFM

state is available only if the state feature is enabled or if it is prefixed with CORE::. The state feature is enabled automatically with a use v5.10(or higher) declaration in the current scope.