Yes. To amplify the point about autoloading, try this:
use Config;
print "defined before\n" if defined &Config::non_bincompat_options;
Config::non_bincompat_options();
print "defined after\n" if defined &Config::non_bincompat_options;

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Calling the sub causes it to become defined through autoloading.

In reply to Re^2: does a subroutine exist? defined vs glob by Anonymous Monk
in thread does a subroutine exist? defined vs glob by bulk88

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